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GitHub - 101arrowz/fflate: High performance (de)compression in an 8kB package
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22.4362C9.07125 22.5325 9.2775 22.2025 9.2775 21.9137C9.2775 21.6525 9.26375 20.7862 9.26375 19.865C6.5 20.3737 5.785 19.1912 5.565 18.5725C5.44125 18.2562 4.905 17.28 4.4375 17.0187C4.0525 16.8125 3.5025 16.3037 4.42375 16.29C5.29 16.2762 5.90875 17.0875 6.115 17.4175C7.105 19.0812 8.68625 18.6137 9.31875 18.325C9.415 17.61 9.70375 17.1287 10.02 16.8537C7.5725 16.5787 5.015 15.63 5.015 11.4225C5.015 10.2262 5.44125 9.23625 6.1425 8.46625C6.0325 8.19125 5.6475 7.06375 6.2525 5.55125C6.2525 5.55125 7.17375 5.2625 9.2775 6.67875C10.1575 6.43125 11.0925 6.3075 12.0275 6.3075C12.9625 6.3075 13.8975 6.43125 14.7775 6.67875C16.8813 5.24875 17.8025 5.55125 17.8025 5.55125C18.4075 7.06375 18.0225 8.19125 17.9125 8.46625C18.6138 9.23625 19.04 10.2125 19.04 11.4225C19.04 15.6437 16.4688 16.5787 14.0213 16.8537C14.42 17.1975 14.7638 17.8575 14.7638 18.8887C14.7638 20.36 14.75 21.5425 14.75 21.9137C14.75 22.2025 14.9563 22.5462 15.5063 22.4362C19.8513 20.9787 23 16.8537 23 12C23 5.9225 18.0775 1 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0 0 1-.052-1.086c0-1.331.282-2.499 1.132-3.368.397-.406.89-.717 1.474-.952 1.399-1.136 3.392-2.093 6.122-2.093 2.731 0 4.767.957 6.166 2.093.584.235 1.077.546 1.474.952.85.869 1.132 2.037 1.132 3.368 0 .368-.014.733-.052 1.086.23.462.477 1.088.644 1.517 1.258.364 2.233 1.721 2.605 2.656a.832.832 0 0 1 .053.22v2.869a.641.641 0 0 1-.078.256ZM12.172 11h-.344a4.323 4.323 0 0 1-.355.508C10.703 12.455 9.555 13 7.965 13c-1.725 0-2.989-.359-3.782-1.259a2.005 2.005 0 0 1-.085-.104L4 11.741v6.585c1.435.779 4.514 2.179 8 2.179 3.486 0 6.565-1.4 8-2.179v-6.585l-.098-.104s-.033.045-.085.104c-.793.9-2.057 1.259-3.782 1.259-1.59 0-2.738-.545-3.508-1.492a4.323 4.323 0 0 1-.355-.508h-.016.016Zm.641-2.935c.136 1.057.403 1.913.878 2.497.442.544 1.134.938 2.344.938 1.573 0 2.292-.337 2.657-.751.384-.435.558-1.15.558-2.361 0-1.14-.243-1.847-.705-2.319-.477-.488-1.319-.862-2.824-1.025-1.487-.161-2.192.138-2.533.529-.269.307-.437.808-.438 1.578v.021c0 .265.021.562.063.893Zm-1.626 0c.042-.331.063-.628.063-.894v-.02c-.001-.77-.169-1.271-.438-1.578-.341-.391-1.046-.69-2.533-.529-1.505.163-2.347.537-2.824 1.025-.462.472-.705 1.179-.705 2.319 0 1.211.175 1.926.558 2.361.365.414 1.084.751 2.657.751 1.21 0 1.902-.394 2.344-.938.475-.584.742-1.44.878-2.497Z"></path><path d="M14.5 14.25a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Zm-5 0a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Z"></path> </svg> <div> <div class="color-fg-default h4">GitHub Copilot</div> Write better code with AI </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"github_advanced_security","context":"product","tag":"link","label":"github_advanced_security_link_product_navbar"}" href="https://github.com/security/advanced-security"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" 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0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary Link--external" target="_blank" data-analytics-event="{"location":"navbar","action":"github_skills","context":"product","tag":"link","label":"github_skills_link_product_navbar"}" href="https://skills.github.com"> GitHub Skills <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-link-external HeaderMenu-external-icon color-fg-subtle"> <path d="M3.75 2h3.5a.75.75 0 0 1 0 1.5h-3.5a.25.25 0 0 0-.25.25v8.5c0 .138.112.25.25.25h8.5a.25.25 0 0 0 .25-.25v-3.5a.75.75 0 0 1 1.5 0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 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</div> </modal-dialog></div> </div> <div data-action="click:qbsearch-input#retract" class="dark-backdrop position-fixed" hidden data-target="qbsearch-input.darkBackdrop"></div> <div class="color-fg-default"> <dialog-helper> <dialog data-target="qbsearch-input.feedbackDialog" data-action="close:qbsearch-input#handleDialogClose cancel:qbsearch-input#handleDialogClose" id="feedback-dialog" aria-modal="true" aria-labelledby="feedback-dialog-title" aria-describedby="feedback-dialog-description" data-view-component="true" class="Overlay Overlay-whenNarrow Overlay--size-medium Overlay--motion-scaleFade Overlay--disableScroll"> <div data-view-component="true" class="Overlay-header"> <div class="Overlay-headerContentWrap"> <div class="Overlay-titleWrap"> <h1 class="Overlay-title " id="feedback-dialog-title"> Provide feedback </h1> </div> <div class="Overlay-actionWrap"> <button data-close-dialog-id="feedback-dialog" aria-label="Close" type="button" data-view-component="true" class="close-button 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seriously.</p> <textarea name="feedback" class="form-control width-full mb-2" style="height: 120px" id="feedback"></textarea> <input name="include_email" id="include_email" aria-label="Include my email address so I can be contacted" class="form-control mr-2" type="checkbox"> <label for="include_email" style="font-weight: normal">Include my email address so I can be contacted</label> </form></div> </scrollable-region> <div data-view-component="true" class="Overlay-footer Overlay-footer--alignEnd"> <button data-close-dialog-id="feedback-dialog" type="button" data-view-component="true" class="btn"> Cancel </button> <button form="code-search-feedback-form" data-action="click:qbsearch-input#submitFeedback" type="submit" data-view-component="true" class="btn-primary btn"> Submit feedback </button> </div> </dialog></dialog-helper> <custom-scopes data-target="qbsearch-input.customScopesManager"> <dialog-helper> <dialog data-target="custom-scopes.customScopesModalDialog" data-action="close:qbsearch-input#handleDialogClose cancel:qbsearch-input#handleDialogClose" id="custom-scopes-dialog" aria-modal="true" aria-labelledby="custom-scopes-dialog-title" aria-describedby="custom-scopes-dialog-description" data-view-component="true" class="Overlay Overlay-whenNarrow Overlay--size-medium Overlay--motion-scaleFade Overlay--disableScroll"> <div data-view-component="true" class="Overlay-header Overlay-header--divided"> <div class="Overlay-headerContentWrap"> <div class="Overlay-titleWrap"> <h1 class="Overlay-title " id="custom-scopes-dialog-title"> Saved searches </h1> <h2 id="custom-scopes-dialog-description" class="Overlay-description">Use saved searches to filter your results more quickly</h2> </div> <div class="Overlay-actionWrap"> <button data-close-dialog-id="custom-scopes-dialog" aria-label="Close" type="button" data-view-component="true" class="close-button Overlay-closeButton"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x"> <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path> </svg></button> </div> </div> </div> <scrollable-region data-labelled-by="custom-scopes-dialog-title"> <div data-view-component="true" class="Overlay-body"> <div data-target="custom-scopes.customScopesModalDialogFlash"></div> <div hidden class="create-custom-scope-form" data-target="custom-scopes.createCustomScopeForm"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form id="custom-scopes-dialog-form" data-turbo="false" action="/search/custom_scopes" accept-charset="UTF-8" method="post"><input type="hidden" data-csrf="true" name="authenticity_token" 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dir=\"auto\"\u003efflate\u003c/h1\u003e\u003ca id=\"user-content-fflate\" class=\"anchor\" aria-label=\"Permalink: fflate\" href=\"#fflate\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eHigh performance (de)compression in an 8kB package\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWhy fflate?\u003c/h2\u003e\u003ca id=\"user-content-why-fflate\" class=\"anchor\" aria-label=\"Permalink: Why fflate?\" href=\"#why-fflate\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003efflate\u003c/code\u003e (short for fast flate) is the \u003cstrong\u003efastest, smallest, and most versatile\u003c/strong\u003e pure JavaScript compression and decompression library in existence, handily beating \u003ca href=\"https://npmjs.com/package/pako\" rel=\"nofollow\"\u003e\u003ccode\u003epako\u003c/code\u003e\u003c/a\u003e, \u003ca href=\"https://npmjs.com/package/tiny-inflate\" rel=\"nofollow\"\u003e\u003ccode\u003etiny-inflate\u003c/code\u003e\u003c/a\u003e, and \u003ca href=\"https://github.com/photopea/UZIP.js\"\u003e\u003ccode\u003eUZIP.js\u003c/code\u003e\u003c/a\u003e in performance benchmarks while being multiple times more lightweight. Its compression ratios are often better than even the original Zlib C library. It includes support for DEFLATE, GZIP, and Zlib data. Data compressed by \u003ccode\u003efflate\u003c/code\u003e can be decompressed by other tools, and vice versa.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn addition to the base decompression and compression APIs, \u003ccode\u003efflate\u003c/code\u003e supports high-speed ZIP file archiving for an extra 3 kB. In fact, the compressor, in synchronous mode, compresses both more quickly and with a higher compression ratio than most compression software (even Info-ZIP, a C program), and in asynchronous mode it can utilize multiple threads to achieve over 3x the performance of virtually any other utility.\u003c/p\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003c/th\u003e\n\u003cth\u003e\u003ccode\u003epako\u003c/code\u003e\u003c/th\u003e\n\u003cth\u003e\u003ccode\u003etiny-inflate\u003c/code\u003e\u003c/th\u003e\n\u003cth\u003e\u003ccode\u003eUZIP.js\u003c/code\u003e\u003c/th\u003e\n\u003cth\u003e\u003ccode\u003efflate\u003c/code\u003e\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDecompression performance\u003c/td\u003e\n\u003ctd\u003e1x\u003c/td\u003e\n\u003ctd\u003eUp to 40% slower\u003c/td\u003e\n\u003ctd\u003e\u003cstrong\u003eUp to 40% faster\u003c/strong\u003e\u003c/td\u003e\n\u003ctd\u003e\u003cstrong\u003eUp to 40% faster\u003c/strong\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompression performance\u003c/td\u003e\n\u003ctd\u003e1x\u003c/td\u003e\n\u003ctd\u003eN/A\u003c/td\u003e\n\u003ctd\u003eUp to 25% faster\u003c/td\u003e\n\u003ctd\u003e\u003cstrong\u003eUp to 50% faster\u003c/strong\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBase bundle size (minified)\u003c/td\u003e\n\u003ctd\u003e45.6kB\u003c/td\u003e\n\u003ctd\u003e\u003cstrong\u003e3kB (inflate only)\u003c/strong\u003e\u003c/td\u003e\n\u003ctd\u003e14.2kB\u003c/td\u003e\n\u003ctd\u003e8kB \u003cstrong\u003e(3kB for inflate only)\u003c/strong\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDecompression support\u003c/td\u003e\n\u003ctd\u003e✅\u003c/td\u003e\n\u003ctd\u003e✅\u003c/td\u003e\n\u003ctd\u003e✅\u003c/td\u003e\n\u003ctd\u003e✅\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompression support\u003c/td\u003e\n\u003ctd\u003e✅\u003c/td\u003e\n\u003ctd\u003e❌\u003c/td\u003e\n\u003ctd\u003e✅\u003c/td\u003e\n\u003ctd\u003e✅\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eZIP support\u003c/td\u003e\n\u003ctd\u003e❌\u003c/td\u003e\n\u003ctd\u003e❌\u003c/td\u003e\n\u003ctd\u003e✅\u003c/td\u003e\n\u003ctd\u003e✅\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStreaming support\u003c/td\u003e\n\u003ctd\u003e✅\u003c/td\u003e\n\u003ctd\u003e❌\u003c/td\u003e\n\u003ctd\u003e❌\u003c/td\u003e\n\u003ctd\u003e✅\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGZIP support\u003c/td\u003e\n\u003ctd\u003e✅\u003c/td\u003e\n\u003ctd\u003e❌\u003c/td\u003e\n\u003ctd\u003e❌\u003c/td\u003e\n\u003ctd\u003e✅\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupports files up to 4GB\u003c/td\u003e\n\u003ctd\u003e✅\u003c/td\u003e\n\u003ctd\u003e❌\u003c/td\u003e\n\u003ctd\u003e❌\u003c/td\u003e\n\u003ctd\u003e✅\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDoesn't hang on error\u003c/td\u003e\n\u003ctd\u003e✅\u003c/td\u003e\n\u003ctd\u003e❌\u003c/td\u003e\n\u003ctd\u003e❌\u003c/td\u003e\n\u003ctd\u003e✅\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDictionary support\u003c/td\u003e\n\u003ctd\u003e✅\u003c/td\u003e\n\u003ctd\u003e❌\u003c/td\u003e\n\u003ctd\u003e❌\u003c/td\u003e\n\u003ctd\u003e✅\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMulti-thread/Asynchronous\u003c/td\u003e\n\u003ctd\u003e❌\u003c/td\u003e\n\u003ctd\u003e❌\u003c/td\u003e\n\u003ctd\u003e❌\u003c/td\u003e\n\u003ctd\u003e✅\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStreaming ZIP support\u003c/td\u003e\n\u003ctd\u003e❌\u003c/td\u003e\n\u003ctd\u003e❌\u003c/td\u003e\n\u003ctd\u003e❌\u003c/td\u003e\n\u003ctd\u003e✅\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUses ES Modules\u003c/td\u003e\n\u003ctd\u003e❌\u003c/td\u003e\n\u003ctd\u003e❌\u003c/td\u003e\n\u003ctd\u003e❌\u003c/td\u003e\n\u003ctd\u003e✅\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eDemo\u003c/h2\u003e\u003ca id=\"user-content-demo\" class=\"anchor\" aria-label=\"Permalink: Demo\" href=\"#demo\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf you'd like to try \u003ccode\u003efflate\u003c/code\u003e for yourself without installing it, you can take a look at the \u003ca href=\"https://101arrowz.github.io/fflate\" rel=\"nofollow\"\u003ebrowser demo\u003c/a\u003e. Since \u003ccode\u003efflate\u003c/code\u003e is a pure JavaScript library, it works in both the browser and Node.js (see \u003ca href=\"https://github.com/101arrowz/fflate/#browser-support\"\u003eBrowser support\u003c/a\u003e for more info).\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eUsage\u003c/h2\u003e\u003ca id=\"user-content-usage\" class=\"anchor\" aria-label=\"Permalink: Usage\" href=\"#usage\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eInstall \u003ccode\u003efflate\u003c/code\u003e:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"npm i fflate # or yarn add fflate, or pnpm add fflate\"\u003e\u003cpre\u003enpm i fflate \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e#\u003c/span\u003e or yarn add fflate, or pnpm add fflate\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eImport:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"// I will assume that you use the following for the rest of this guide\nimport * as fflate from 'fflate';\n\n// However, you should import ONLY what you need to minimize bloat.\n// So, if you just need GZIP compression support:\nimport { gzipSync } from 'fflate';\n// Woo! You just saved 20 kB off your bundle with one line.\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e// I will assume that you use the following for the rest of this guide\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eas\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'fflate'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// However, you should import ONLY what you need to minimize bloat.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// So, if you just need GZIP compression support:\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003egzipSync\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'fflate'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// Woo! You just saved 20 kB off your bundle with one line.\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf your environment doesn't support ES Modules (e.g. Node.js):\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"// Try to avoid this when using fflate in the browser, as it will import\n// all of fflate's components, even those that you aren't using.\nconst fflate = require('fflate');\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e// Try to avoid this when using fflate in the browser, as it will import\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// all of fflate's components, even those that you aren't using.\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-en\"\u003erequire\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'fflate'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf you want to load from a CDN in the browser:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-basic notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"\u0026lt;!--\nYou should use either UNPKG or jsDelivr (i.e. only one of the following)\n\nNote that tree shaking is completely unsupported from the CDN. If you want\na small build without build tools, please ask me and I will make one manually\nwith only the features you need. This build is about 31kB, or 11.5kB gzipped.\n--\u0026gt;\n\u0026lt;script src=\u0026quot;https://unpkg.com/fflate@0.8.2\u0026quot;\u0026gt;\u0026lt;/script\u0026gt;\n\u0026lt;script src=\u0026quot;https://cdn.jsdelivr.net/npm/fflate@0.8.2/umd/index.js\u0026quot;\u0026gt;\u0026lt;/script\u0026gt;\n\u0026lt;!-- Now, the global variable fflate contains the library --\u0026gt;\n\n\u0026lt;!-- If you're going buildless but want ESM, import from Skypack --\u0026gt;\n\u0026lt;script type=\u0026quot;module\u0026quot;\u0026gt;\n import * as fflate from 'https://cdn.skypack.dev/fflate@0.8.2?min';\n\u0026lt;/script\u0026gt;\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e\u0026lt;!--\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003eYou should use either UNPKG or jsDelivr (i.e. only one of the following)\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003eNote that tree shaking is completely unsupported from the CDN. If you want\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003ea small build without build tools, please ask me and I will make one manually\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003ewith only the features you need. This build is about 31kB, or 11.5kB gzipped.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e--\u0026gt;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003esrc\u003c/span\u003e=\"\u003cspan class=\"pl-s\"\u003ehttps://unpkg.com/fflate@0.8.2\u003c/span\u003e\"\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026lt;/\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003esrc\u003c/span\u003e=\"\u003cspan class=\"pl-s\"\u003ehttps://cdn.jsdelivr.net/npm/fflate@0.8.2/umd/index.js\u003c/span\u003e\"\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026lt;/\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e\u0026lt;!-- Now, the global variable fflate contains the library --\u0026gt;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e\u0026lt;!-- If you're going buildless but want ESM, import from Skypack --\u0026gt;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etype\u003c/span\u003e=\"\u003cspan class=\"pl-s\"\u003emodule\u003c/span\u003e\"\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eas\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'https://cdn.skypack.dev/fflate@0.8.2?min'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e\u0026lt;/\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf you are using Deno:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"// Don't use the ?dts Skypack flag; it isn't necessary for Deno support\n// The @deno-types comment adds TypeScript typings\n\n// @deno-types=\u0026quot;https://cdn.skypack.dev/fflate@0.8.2/lib/index.d.ts\u0026quot;\nimport * as fflate from 'https://cdn.skypack.dev/fflate@0.8.2?min';\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e// Don't use the ?dts Skypack flag; it isn't necessary for Deno support\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// The \u003cspan class=\"pl-k\"\u003e@deno\u003c/span\u003e-types comment adds TypeScript typings\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// \u003cspan class=\"pl-k\"\u003e@deno\u003c/span\u003e-types=\"https://cdn.skypack.dev/fflate@0.8.2/lib/index.d.ts\"\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eas\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'https://cdn.skypack.dev/fflate@0.8.2?min'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf your environment doesn't support bundling:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"// Again, try to import just what you need\n\n// For the browser:\nimport * as fflate from 'fflate/esm/browser.js';\n// If the standard ESM import fails on Node (i.e. older version):\nimport * as fflate from 'fflate/esm';\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e// Again, try to import just what you need\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// For the browser:\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eas\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'fflate/esm/browser.js'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// If the standard ESM import fails on Node (i.e. older version):\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eas\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'fflate/esm'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAnd use:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"// This is an ArrayBuffer of data\nconst massiveFileBuf = await fetch('/aMassiveFile').then(\n res =\u0026gt; res.arrayBuffer()\n);\n// To use fflate, you need a Uint8Array\nconst massiveFile = new Uint8Array(massiveFileBuf);\n// Note that Node.js Buffers work just fine as well:\n// const massiveFile = require('fs').readFileSync('aMassiveFile.txt');\n\n// Higher level means lower performance but better compression\n// The level ranges from 0 (no compression) to 9 (max compression)\n// The default level is 6\nconst notSoMassive = fflate.zlibSync(massiveFile, { level: 9 });\nconst massiveAgain = fflate.unzlibSync(notSoMassive);\nconst gzipped = fflate.gzipSync(massiveFile, {\n // GZIP-specific: the filename to use when decompressed\n filename: 'aMassiveFile.txt',\n // GZIP-specific: the modification time. Can be a Date, date string,\n // or Unix timestamp\n mtime: '9/1/16 2:00 PM'\n});\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e// This is an ArrayBuffer of data\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003emassiveFileBuf\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-en\"\u003efetch\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'/aMassiveFile'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ethen\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003eres\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eres\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003earrayBuffer\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// To use fflate, you need a Uint8Array\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003emassiveFile\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eUint8Array\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003emassiveFileBuf\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// Note that Node.js Buffers work just fine as well:\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// const massiveFile = require('fs').readFileSync('aMassiveFile.txt');\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// Higher level means lower performance but better compression\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// The level ranges from 0 (no compression) to 9 (max compression)\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// The default level is 6\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003enotSoMassive\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ezlibSync\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003emassiveFile\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003elevel\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e9\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003emassiveAgain\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eunzlibSync\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003enotSoMassive\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003egzipped\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003egzipSync\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003emassiveFile\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// GZIP-specific: the filename to use when decompressed\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003efilename\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e'aMassiveFile.txt'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// GZIP-specific: the modification time. Can be a Date, date string,\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// or Unix timestamp\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003emtime\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e'9/1/16 2:00 PM'\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003efflate\u003c/code\u003e can autodetect a compressed file's format as well:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"const compressed = new Uint8Array(\n await fetch('/GZIPorZLIBorDEFLATE').then(res =\u0026gt; res.arrayBuffer())\n);\n// Above example with Node.js Buffers:\n// Buffer.from('H4sIAAAAAAAAE8tIzcnJBwCGphA2BQAAAA==', 'base64');\n\nconst decompressed = fflate.decompressSync(compressed);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ecompressed\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eUint8Array\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-en\"\u003efetch\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'/GZIPorZLIBorDEFLATE'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ethen\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eres\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eres\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003earrayBuffer\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// Above example with Node.js Buffers:\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// Buffer.from('H4sIAAAAAAAAE8tIzcnJBwCGphA2BQAAAA==', 'base64');\u003c/span\u003e\n\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003edecompressed\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003edecompressSync\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ecompressed\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eUsing strings is easy with \u003ccode\u003efflate\u003c/code\u003e's string conversion API:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"const buf = fflate.strToU8('Hello world!');\n\n// The default compression method is gzip\n// Increasing mem may increase performance at the cost of memory\n// The mem ranges from 0 to 12, where 4 is the default\nconst compressed = fflate.compressSync(buf, { level: 6, mem: 8 });\n\n// When you need to decompress:\nconst decompressed = fflate.decompressSync(compressed);\nconst origText = fflate.strFromU8(decompressed);\nconsole.log(origText); // Hello world!\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ebuf\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003estrToU8\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'Hello world!'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// The default compression method is gzip\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// Increasing mem may increase performance at the cost of memory\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// The mem ranges from 0 to 12, where 4 is the default\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ecompressed\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ecompressSync\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ebuf\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003elevel\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e6\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003emem\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e8\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// When you need to decompress:\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003edecompressed\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003edecompressSync\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ecompressed\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eorigText\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003estrFromU8\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003edecompressed\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eorigText\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// Hello world!\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf you need to use an (albeit inefficient) binary string, you can set the second argument to \u003ccode\u003etrue\u003c/code\u003e.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"const buf = fflate.strToU8('Hello world!');\n\n// The second argument, latin1, is a boolean that indicates that the data\n// is not Unicode but rather should be encoded and decoded as Latin-1.\n// This is useful for creating a string from binary data that isn't\n// necessarily valid UTF-8. However, binary strings are incredibly\n// inefficient and tend to double file size, so they're not recommended.\nconst compressedString = fflate.strFromU8(\n fflate.compressSync(buf),\n true\n);\nconst decompressed = fflate.decompressSync(\n fflate.strToU8(compressedString, true)\n);\nconst origText = fflate.strFromU8(decompressed);\nconsole.log(origText); // Hello world!\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ebuf\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003estrToU8\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'Hello world!'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// The second argument, latin1, is a boolean that indicates that the data\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// is not Unicode but rather should be encoded and decoded as Latin-1.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// This is useful for creating a string from binary data that isn't\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// necessarily valid UTF-8. However, binary strings are incredibly\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// inefficient and tend to double file size, so they're not recommended.\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ecompressedString\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003estrFromU8\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ecompressSync\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ebuf\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003edecompressed\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003edecompressSync\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003estrToU8\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ecompressedString\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eorigText\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003estrFromU8\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003edecompressed\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eorigText\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// Hello world!\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eYou can use streams as well to incrementally add data to be compressed or decompressed:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"// This example uses synchronous streams, but for the best experience\n// you'll definitely want to use asynchronous streams.\n\nlet outStr = '';\nconst gzipStream = new fflate.Gzip({ level: 9 }, (chunk, isLast) =\u0026gt; {\n // accumulate in an inefficient binary string (just an example)\n outStr += fflate.strFromU8(chunk, true);\n});\n\n// You can also attach the data handler separately if you don't want to\n// do so in the constructor.\ngzipStream.ondata = (chunk, final) =\u0026gt; { ... }\n\n// Since this is synchronous, all errors will be thrown by stream.push()\ngzipStream.push(chunk1);\ngzipStream.push(chunk2);\n\n...\n\n// You should mark the last chunk by using true in the second argument\n// In addition to being necessary for the stream to work properly, this\n// will also set the isLast parameter in the handler to true.\ngzipStream.push(lastChunk, true);\n\nconsole.log(outStr); // The compressed binary string is now available\n\n// The options parameter for compression streams is optional; you can\n// provide one parameter (the handler) or none at all if you set\n// deflateStream.ondata later.\nconst deflateStream = new fflate.Deflate((chunk, final) =\u0026gt; {\n console.log(chunk, final);\n});\n\n// If you want to create a stream from strings, use EncodeUTF8\nconst utfEncode = new fflate.EncodeUTF8((data, final) =\u0026gt; {\n // Chaining streams together is done by pushing to the\n // next stream in the handler for the previous stream\n deflateStream.push(data, final);\n});\n\nutfEncode.push('Hello'.repeat(1000));\nutfEncode.push(' '.repeat(100));\nutfEncode.push('world!'.repeat(10), true);\n\n// The deflateStream has logged the compressed data\n\nconst inflateStream = new fflate.Inflate();\ninflateStream.ondata = (decompressedChunk, final) =\u0026gt; { ... };\n\nlet stringData = '';\n\n// Streaming UTF-8 decode is available too\nconst utfDecode = new fflate.DecodeUTF8((data, final) =\u0026gt; {\n stringData += data;\n});\n\n// Decompress streams auto-detect the compression method, as the\n// non-streaming decompress() method does.\nconst dcmpStrm = new fflate.Decompress((chunk, final) =\u0026gt; {\n console.log(chunk, 'was encoded with GZIP, Zlib, or DEFLATE');\n utfDecode.push(chunk, final);\n});\n\ndcmpStrm.push(zlibJSONData1);\ndcmpStrm.push(zlibJSONData2, true);\n\n// This succeeds; the UTF-8 decoder chained with the unknown compression format\n// stream to reach a string as a sink.\nconsole.log(JSON.parse(stringData));\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e// This example uses synchronous streams, but for the best experience\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// you'll definitely want to use asynchronous streams.\u003c/span\u003e\n\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eoutStr\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e''\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003egzipStream\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eGzip\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003elevel\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e9\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003echunk\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eisLast\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// accumulate in an inefficient binary string (just an example)\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003eoutStr\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e+=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003estrFromU8\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003echunk\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// You can also attach the data handler separately if you don't want to\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// do so in the constructor.\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003egzipStream\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eondata\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003echunk\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efinal\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e ... \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// Since this is synchronous, all errors will be thrown by stream.push()\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003egzipStream\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003epush\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003echunk1\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003egzipStream\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003epush\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003echunk2\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n...\n\n\u003cspan class=\"pl-c\"\u003e// You should mark the last chunk by using true in the second argument\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// In addition to being necessary for the stream to work properly, this\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// will also set the isLast parameter in the handler to true.\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003egzipStream\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003epush\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003elastChunk\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eoutStr\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// The compressed binary string is now available\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// The options parameter for compression streams is optional; you can\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// provide one parameter (the handler) or none at all if you set\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// deflateStream.ondata later.\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003edeflateStream\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eDeflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003echunk\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efinal\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003echunk\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efinal\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// If you want to create a stream from strings, use EncodeUTF8\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eutfEncode\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eEncodeUTF8\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003edata\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efinal\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Chaining streams together is done by pushing to the\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// next stream in the handler for the previous stream\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003edeflateStream\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003epush\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003edata\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efinal\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-s1\"\u003eutfEncode\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003epush\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'Hello'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003erepeat\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e1000\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003eutfEncode\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003epush\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e' '\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003erepeat\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e100\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003eutfEncode\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003epush\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'world!'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003erepeat\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e10\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// The deflateStream has logged the compressed data\u003c/span\u003e\n\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003einflateStream\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eInflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003einflateStream\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eondata\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003edecompressedChunk\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efinal\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e ... \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003estringData\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e''\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// Streaming UTF-8 decode is available too\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eutfDecode\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eDecodeUTF8\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003edata\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efinal\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003estringData\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e+=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003edata\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// Decompress streams auto-detect the compression method, as the\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// non-streaming decompress() method does.\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003edcmpStrm\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eDecompress\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003echunk\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efinal\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003echunk\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'was encoded with GZIP, Zlib, or DEFLATE'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003eutfDecode\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003epush\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003echunk\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efinal\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-s1\"\u003edcmpStrm\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003epush\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ezlibJSONData1\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003edcmpStrm\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003epush\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ezlibJSONData2\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// This succeeds; the UTF-8 decoder chained with the unknown compression format\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// stream to reach a string as a sink.\u003c/span\u003e\n\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eJSON\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eparse\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003estringData\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eYou can create multi-file ZIP archives easily as well. Note that by default, compression is enabled for all files, which is not useful when ZIPping many PNGs, JPEGs, PDFs, etc. because those formats are already compressed. You should either override the level on a per-file basis or globally to avoid wasting resources.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"// Note that the asynchronous version (see below) runs in parallel and\n// is *much* (up to 3x) faster for larger archives.\nconst zipped = fflate.zipSync({\n // Directories can be nested structures, as in an actual filesystem\n 'dir1': {\n 'nested': {\n // You can use Unicode in filenames\n '你好.txt': fflate.strToU8('Hey there!')\n },\n // You can also manually write out a directory path\n 'other/tmp.txt': new Uint8Array([97, 98, 99, 100])\n },\n\n // You can also provide compression options\n 'massiveImage.bmp': [aMassiveFile, {\n level: 9,\n mem: 12\n }],\n // PNG is pre-compressed; no need to waste time\n 'superTinyFile.png': [aPNGFile, { level: 0 }],\n\n // Directories take options too\n 'exec': [{\n 'hello.sh': [fflate.strToU8('echo hello world'), {\n // ZIP only: Set the operating system to Unix\n os: 3,\n // ZIP only: Make this file executable on Unix\n attrs: 0o755 \u0026lt;\u0026lt; 16\n }]\n }, {\n // ZIP and GZIP support mtime (defaults to current time)\n mtime: new Date('10/20/2020')\n }]\n}, {\n // These options are the defaults for all files, but file-specific\n // options take precedence.\n level: 1,\n // Obfuscate last modified time by default \n mtime: new Date('1/1/1980')\n});\n\n// If you write the zipped data to myzip.zip and unzip, the folder\n// structure will be outputted as:\n\n// myzip.zip (original file)\n// dir1\n// |-\u0026gt; nested\n// | |-\u0026gt; 你好.txt\n// |-\u0026gt; other\n// | |-\u0026gt; tmp.txt\n// massiveImage.bmp\n// superTinyFile.png\n\n// When decompressing, folders are not nested; all filepaths are fully\n// written out in the keys. For example, the return value may be:\n// { 'nested/directory/structure.txt': Uint8Array(2) [97, 97] }\nconst decompressed = fflate.unzipSync(zipped, {\n // You may optionally supply a filter for files. By default, all files in a\n // ZIP archive are extracted, but a filter can save resources by telling\n // the library not to decompress certain files\n filter(file) {\n // Don't decompress the massive image or any files larger than 10 MiB\n return file.name != 'massiveImage.bmp' \u0026amp;\u0026amp; file.originalSize \u0026lt;= 10_000_000;\n }\n});\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e// Note that the asynchronous version (see below) runs in parallel and\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// is *much* (up to 3x) faster for larger archives.\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ezipped\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ezipSync\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Directories can be nested structures, as in an actual filesystem\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e'dir1'\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e'nested'\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// You can use Unicode in filenames\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e'你好.txt'\u003c/span\u003e: \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003estrToU8\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'Hey there!'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// You can also manually write out a directory path\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e'other/tmp.txt'\u003c/span\u003e: \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eUint8Array\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e97\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e98\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e99\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e100\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e// You can also provide compression options\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e'massiveImage.bmp'\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eaMassiveFile\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003elevel\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e9\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003emem\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e12\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// PNG is pre-compressed; no need to waste time\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e'superTinyFile.png'\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eaPNGFile\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003elevel\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e// Directories take options too\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e'exec'\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e'hello.sh'\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003estrToU8\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'echo hello world'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// ZIP only: Set the operating system to Unix\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eos\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e3\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// ZIP only: Make this file executable on Unix\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eattrs\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e0o755\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u0026lt;\u0026lt;\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e16\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// ZIP and GZIP support mtime (defaults to current time)\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003emtime\u003c/span\u003e: \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eDate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'10/20/2020'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// These options are the defaults for all files, but file-specific\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// options take precedence.\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003elevel\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Obfuscate last modified time by default \u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003emtime\u003c/span\u003e: \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eDate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'1/1/1980'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// If you write the zipped data to myzip.zip and unzip, the folder\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// structure will be outputted as:\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// myzip.zip (original file)\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// dir1\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// |-\u0026gt; nested\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// | |-\u0026gt; 你好.txt\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// |-\u0026gt; other\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// | |-\u0026gt; tmp.txt\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// massiveImage.bmp\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// superTinyFile.png\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// When decompressing, folders are not nested; all filepaths are fully\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// written out in the keys. For example, the return value may be:\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// { 'nested/directory/structure.txt': Uint8Array(2) [97, 97] }\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003edecompressed\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eunzipSync\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ezipped\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// You may optionally supply a filter for files. By default, all files in a\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// ZIP archive are extracted, but a filter can save resources by telling\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// the library not to decompress certain files\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003efilter\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003efile\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Don't decompress the massive image or any files larger than 10 MiB\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efile\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ename\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e!=\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'massiveImage.bmp'\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u0026amp;\u0026amp;\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efile\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eoriginalSize\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u0026lt;=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e10_000_000\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf you need extremely high performance or custom ZIP compression formats, you can use the highly-extensible ZIP streams. They take streams as both input and output. You can even use custom compression/decompression algorithms from other libraries, as long as they \u003ca href=\"https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT\" rel=\"nofollow\"\u003eare defined in the ZIP spec\u003c/a\u003e (see section 4.4.5). If you'd like more info on using custom compressors, \u003ca href=\"https://github.com/101arrowz/fflate/discussions\"\u003efeel free to ask\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"// ZIP object\n// Can also specify zip.ondata outside of the constructor\nconst zip = new fflate.Zip((err, dat, final) =\u0026gt; {\n if (!err) {\n // output of the streams\n console.log(dat, final);\n }\n});\n\nconst helloTxt = new fflate.ZipDeflate('hello.txt', {\n level: 9\n});\n\n// Always add streams to ZIP archives before pushing to those streams\nzip.add(helloTxt);\n\nhelloTxt.push(chunk1);\n// Last chunk\nhelloTxt.push(chunk2, true);\n\n// ZipPassThrough is like ZipDeflate with level 0, but allows for tree shaking\nconst nonStreamingFile = new fflate.ZipPassThrough('test.png');\nzip.add(nonStreamingFile);\n// If you have data already loaded, just .push(data, true)\nnonStreamingFile.push(pngData, true);\n\n// You need to call .end() after finishing\n// This ensures the ZIP is valid\nzip.end();\n\n// Unzip object\nconst unzipper = new fflate.Unzip();\n\n// This function will almost always have to be called. It is used to support\n// compression algorithms such as BZIP2 or LZMA in ZIP files if just DEFLATE\n// is not enough (though it almost always is).\n// If your ZIP files are not compressed, this line is not needed.\nunzipper.register(fflate.UnzipInflate);\n\nconst neededFiles = ['file1.txt', 'example.json'];\n\n// Can specify handler in constructor too\nunzipper.onfile = file =\u0026gt; {\n // file.name is a string, file is a stream\n if (neededFiles.includes(file.name)) {\n file.ondata = (err, dat, final) =\u0026gt; {\n // Stream output here\n console.log(dat, final);\n };\n \n console.log('Reading:', file.name);\n\n // File sizes are sometimes not set if the ZIP file did not encode\n // them, so you may want to check that file.size != undefined\n console.log('Compressed size', file.size);\n console.log('Decompressed size', file.originalSize);\n\n // You should only start the stream if you plan to use it to improve\n // performance. Only after starting the stream will ondata be called.\n // This method will throw if the compression method hasn't been registered\n file.start();\n }\n};\n\n// Try to keep under 5,000 files per chunk to avoid stack limit errors\n// For example, if all files are a few kB, multi-megabyte chunks are OK\n// If files are mostly under 100 bytes, 64kB chunks are the limit\nunzipper.push(zipChunk1);\nunzipper.push(zipChunk2);\nunzipper.push(zipChunk3, true);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e// ZIP object\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// Can also specify zip.ondata outside of the constructor\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ezip\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eZip\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eerr\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003edat\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efinal\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e!\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eerr\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// output of the streams\u003c/span\u003e\n \u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003edat\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efinal\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ehelloTxt\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eZipDeflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'hello.txt'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003elevel\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e9\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// Always add streams to ZIP archives before pushing to those streams\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003ezip\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eadd\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ehelloTxt\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-s1\"\u003ehelloTxt\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003epush\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003echunk1\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// Last chunk\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003ehelloTxt\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003epush\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003echunk2\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// ZipPassThrough is like ZipDeflate with level 0, but allows for tree shaking\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003enonStreamingFile\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eZipPassThrough\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'test.png'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003ezip\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eadd\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003enonStreamingFile\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// If you have data already loaded, just .push(data, true)\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003enonStreamingFile\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003epush\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003epngData\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// You need to call .end() after finishing\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// This ensures the ZIP is valid\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003ezip\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eend\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// Unzip object\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eunzipper\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eUnzip\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// This function will almost always have to be called. It is used to support\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// compression algorithms such as BZIP2 or LZMA in ZIP files if just DEFLATE\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// is not enough (though it almost always is).\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// If your ZIP files are not compressed, this line is not needed.\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003eunzipper\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eregister\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003efflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eUnzipInflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eneededFiles\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'file1.txt'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'example.json'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// Can specify handler in constructor too\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003eunzipper\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eonfile\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efile\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// file.name is a string, file is a stream\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eneededFiles\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eincludes\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003efile\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ename\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003efile\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eondata\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eerr\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003edat\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efinal\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Stream output here\u003c/span\u003e\n \u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003edat\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efinal\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \n \u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'Reading:'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efile\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ename\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e// File sizes are sometimes not set if the ZIP file did not encode\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// them, so you may want to check that file.size != undefined\u003c/span\u003e\n \u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'Compressed size'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efile\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003esize\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'Decompressed size'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efile\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eoriginalSize\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e// You should only start the stream if you plan to use it to improve\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// performance. Only after starting the stream will ondata be called.\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// This method will throw if the compression method hasn't been registered\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003efile\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003estart\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// Try to keep under 5,000 files per chunk to avoid stack limit errors\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// For example, if all files are a few kB, multi-megabyte chunks are OK\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// If files are mostly under 100 bytes, 64kB chunks are the limit\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003eunzipper\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003epush\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ezipChunk1\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003eunzipper\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003epush\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ezipChunk2\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003eunzipper\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003epush\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ezipChunk3\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAs you may have guessed, there is an asynchronous version of every method as well. Unlike most libraries, this will cause the compression or decompression run in a separate thread entirely and automatically by using Web (or Node) Workers. This means that the processing will not block the main thread at all.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eNote that there is a significant initial overhead to using workers of about 50ms for each asynchronous function. For instance, if you call \u003ccode\u003eunzip\u003c/code\u003e ten times, the overhead only applies for the first call, but if you call \u003ccode\u003eunzip\u003c/code\u003e and \u003ccode\u003ezlib\u003c/code\u003e, they will each cause the 50ms delay. For small (under about 50kB) payloads, the asynchronous APIs will be much slower. However, if you're compressing larger files/multiple files at once, or if the synchronous API causes the main thread to hang for too long, the callback APIs are an order of magnitude better.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import {\n gzip, zlib, AsyncGzip, zip, unzip, strFromU8,\n Zip, AsyncZipDeflate, Unzip, AsyncUnzipInflate\n} from 'fflate';\n\n// Workers will work in almost any browser (even IE11!)\n// All of the async APIs use a node-style callback as so:\nconst terminate = gzip(aMassiveFile, (err, data) =\u0026gt; {\n if (err) {\n // The compressed data was likely corrupt, so we have to handle\n // the error.\n return;\n }\n // Use data however you like\n console.log(data.length);\n});\n\nif (needToCancel) {\n // The return value of any of the asynchronous APIs is a function that,\n // when called, will immediately cancel the operation. The callback\n // will not be called.\n terminate();\n}\n\n// If you wish to provide options, use the second argument.\n\n// The consume option will render the data inside aMassiveFile unusable,\n// but can improve performance and dramatically reduce memory usage.\nzlib(aMassiveFile, { consume: true, level: 9 }, (err, data) =\u0026gt; {\n // Use the data\n});\n\n// Asynchronous streams are similar to synchronous streams, but the\n// handler has the error that occurred (if any) as the first parameter,\n// and they don't block the main thread.\n\n// Additionally, any buffers that are pushed in will be consumed and\n// rendered unusable; if you need to use a buffer you push in, you\n// should clone it first.\nconst gzs = new AsyncGzip({ level: 9, mem: 12, filename: 'hello.txt' });\nlet wasCallbackCalled = false;\ngzs.ondata = (err, chunk, final) =\u0026gt; {\n // Note the new err parameter\n if (err) {\n // Note that after this occurs, the stream becomes corrupt and must\n // be discarded. You can't continue pushing chunks and expect it to\n // work.\n console.error(err);\n return;\n }\n wasCallbackCalled = true;\n}\ngzs.push(chunk);\n\n// Since the stream is asynchronous, the callback will not be called\n// immediately. If such behavior is absolutely necessary (it shouldn't\n// be), use synchronous streams.\nconsole.log(wasCallbackCalled) // false\n\n// To terminate an asynchronous stream's internal worker, call\n// stream.terminate().\ngzs.terminate();\n\n// This is way faster than zipSync because the compression of multiple\n// files runs in parallel. In fact, the fact that it's parallelized\n// makes it faster than most standalone ZIP CLIs. The effect is most\n// significant for multiple large files; less so for many small ones.\nzip({ f1: aMassiveFile, 'f2.txt': anotherMassiveFile }, {\n // The options object is still optional, you can still do just\n // zip(archive, callback)\n level: 6\n}, (err, data) =\u0026gt; {\n // Save the ZIP file\n});\n\n// unzip is the only async function without support for consume option\n// It is parallelized, so unzip is also often much faster than unzipSync\nunzip(aMassiveZIPFile, (err, unzipped) =\u0026gt; {\n // If the archive has data.xml, log it here\n console.log(unzipped['data.xml']);\n // Conversion to string\n console.log(strFromU8(unzipped['data.xml']))\n});\n\n// Streaming ZIP archives can accept asynchronous streams. This automatically\n// uses multicore compression.\nconst zip = new Zip();\nzip.ondata = (err, chunk, final) =\u0026gt; { ... };\n// The JSON and BMP are compressed in parallel\nconst exampleFile = new AsyncZipDeflate('example.json');\nzip.add(exampleFile);\nexampleFile.push(JSON.stringify({ large: 'object' }), true);\nconst exampleFile2 = new AsyncZipDeflate('example2.bmp', { level: 9 });\nzip.add(exampleFile2);\nexampleFile2.push(ec2a);\nexampleFile2.push(ec2b);\nexampleFile2.push(ec2c);\n...\nexampleFile2.push(ec2Final, true);\nzip.end();\n\n// Streaming Unzip should register the asynchronous inflation algorithm\n// for parallel processing.\nconst unzip = new Unzip(stream =\u0026gt; {\n if (stream.name.endsWith('.json')) {\n stream.ondata = (err, chunk, final) =\u0026gt; { ... };\n stream.start();\n\n if (needToCancel) {\n // To cancel these streams, call .terminate()\n stream.terminate();\n }\n }\n});\nunzip.register(AsyncUnzipInflate);\nunzip.push(data, true);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003egzip\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ezlib\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eAsyncGzip\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ezip\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eunzip\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003estrFromU8\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-v\"\u003eZip\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eAsyncZipDeflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eUnzip\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eAsyncUnzipInflate\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'fflate'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// Workers will work in almost any browser (even IE11!)\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// All of the async APIs use a node-style callback as so:\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eterminate\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-en\"\u003egzip\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eaMassiveFile\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eerr\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003edata\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eerr\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// The compressed data was likely corrupt, so we have to handle\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// the error.\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Use data however you like\u003c/span\u003e\n \u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003edata\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003elength\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eneedToCancel\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// The return value of any of the asynchronous APIs is a function that,\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// when called, will immediately cancel the operation. The callback\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// will not be called.\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003eterminate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// If you wish to provide options, use the second argument.\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// The consume option will render the data inside aMassiveFile unusable,\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// but can improve performance and dramatically reduce memory usage.\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003ezlib\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eaMassiveFile\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003econsume\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003elevel\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e9\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eerr\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003edata\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Use the data\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// Asynchronous streams are similar to synchronous streams, but the\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// handler has the error that occurred (if any) as the first parameter,\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// and they don't block the main thread.\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// Additionally, any buffers that are pushed in will be consumed and\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// rendered unusable; if you need to use a buffer you push in, you\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// should clone it first.\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003egzs\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eAsyncGzip\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003elevel\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e9\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003emem\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e12\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003efilename\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e'hello.txt'\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ewasCallbackCalled\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003efalse\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003egzs\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eondata\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eerr\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003echunk\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efinal\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Note the new err parameter\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eerr\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Note that after this occurs, the stream becomes corrupt and must\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// be discarded. You can't continue pushing chunks and expect it to\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// work.\u003c/span\u003e\n \u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eerror\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eerr\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003ewasCallbackCalled\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003egzs\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003epush\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003echunk\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// Since the stream is asynchronous, the callback will not be called\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// immediately. If such behavior is absolutely necessary (it shouldn't\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// be), use synchronous streams.\u003c/span\u003e\n\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ewasCallbackCalled\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// false\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// To terminate an asynchronous stream's internal worker, call\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// stream.terminate().\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003egzs\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eterminate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// This is way faster than zipSync because the compression of multiple\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// files runs in parallel. In fact, the fact that it's parallelized\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// makes it faster than most standalone ZIP CLIs. The effect is most\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// significant for multiple large files; less so for many small ones.\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003ezip\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ef1\u003c/span\u003e: \u003cspan class=\"pl-s1\"\u003eaMassiveFile\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'f2.txt'\u003c/span\u003e: \u003cspan class=\"pl-s1\"\u003eanotherMassiveFile\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// The options object is still optional, you can still do just\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// zip(archive, callback)\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003elevel\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e6\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eerr\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003edata\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Save the ZIP file\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// unzip is the only async function without support for consume option\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// It is parallelized, so unzip is also often much faster than unzipSync\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003eunzip\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eaMassiveZIPFile\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eerr\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eunzipped\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// If the archive has data.xml, log it here\u003c/span\u003e\n \u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eunzipped\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'data.xml'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Conversion to string\u003c/span\u003e\n \u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-en\"\u003estrFromU8\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eunzipped\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'data.xml'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// Streaming ZIP archives can accept asynchronous streams. This automatically\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// uses multicore compression.\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ezip\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eZip\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003ezip\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eondata\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eerr\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003echunk\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efinal\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e ... \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// The JSON and BMP are compressed in parallel\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eexampleFile\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eAsyncZipDeflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'example.json'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003ezip\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eadd\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eexampleFile\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003eexampleFile\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003epush\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eJSON\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003estringify\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003elarge\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e'object'\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eexampleFile2\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eAsyncZipDeflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'example2.bmp'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003elevel\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003e9\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003ezip\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eadd\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eexampleFile2\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003eexampleFile2\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003epush\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eec2a\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003eexampleFile2\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003epush\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eec2b\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003eexampleFile2\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003epush\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eec2c\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n...\n\u003cspan class=\"pl-s1\"\u003eexampleFile2\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003epush\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eec2Final\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003ezip\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eend\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// Streaming Unzip should register the asynchronous inflation algorithm\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// for parallel processing.\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eunzip\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eUnzip\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003estream\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003estream\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ename\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eendsWith\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'.json'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003estream\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eondata\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eerr\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003echunk\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efinal\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e ... \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003estream\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003estart\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eneedToCancel\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// To cancel these streams, call .terminate()\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003estream\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eterminate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003eunzip\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eregister\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-v\"\u003eAsyncUnzipInflate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003eunzip\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003epush\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003edata\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSee the \u003ca href=\"https://github.com/101arrowz/fflate/blob/master/docs/README.md\"\u003edocumentation\u003c/a\u003e for more detailed information about the API.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBundle size estimates\u003c/h2\u003e\u003ca id=\"user-content-bundle-size-estimates\" class=\"anchor\" aria-label=\"Permalink: Bundle size estimates\" href=\"#bundle-size-estimates\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe bundle size measurements for \u003ccode\u003efflate\u003c/code\u003e on sites like Bundlephobia include every feature of the library and should be seen as an upper bound. As long as you are using tree shaking or dead code elimination, this table should give you a general idea of \u003ccode\u003efflate\u003c/code\u003e's bundle size for the features you need.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe maximum bundle size that is possible with \u003ccode\u003efflate\u003c/code\u003e is about 31kB (11.5kB gzipped) if you use every single feature, but feature parity with \u003ccode\u003epako\u003c/code\u003e is only around 10kB (as opposed to 45kB from \u003ccode\u003epako\u003c/code\u003e). If your bundle size increases dramatically after adding \u003ccode\u003efflate\u003c/code\u003e, please \u003ca href=\"https://github.com/101arrowz/fflate/issues/new\"\u003ecreate an issue\u003c/a\u003e.\u003c/p\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eFeature\u003c/th\u003e\n\u003cth\u003eBundle size (minified)\u003c/th\u003e\n\u003cth\u003eNearest competitor\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDecompression\u003c/td\u003e\n\u003ctd\u003e3kB\u003c/td\u003e\n\u003ctd\u003e\u003ccode\u003etiny-inflate\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompression\u003c/td\u003e\n\u003ctd\u003e5kB\u003c/td\u003e\n\u003ctd\u003e\u003ccode\u003eUZIP.js\u003c/code\u003e, 2.84x larger\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAsync decompression\u003c/td\u003e\n\u003ctd\u003e4kB (1kB + raw decompression)\u003c/td\u003e\n\u003ctd\u003eN/A\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAsync compression\u003c/td\u003e\n\u003ctd\u003e6kB (1kB + raw compression)\u003c/td\u003e\n\u003ctd\u003eN/A\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eZIP decompression\u003c/td\u003e\n\u003ctd\u003e5kB (2kB + raw decompression)\u003c/td\u003e\n\u003ctd\u003e\u003ccode\u003eUZIP.js\u003c/code\u003e, 2.84x larger\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eZIP compression\u003c/td\u003e\n\u003ctd\u003e7kB (2kB + raw compression)\u003c/td\u003e\n\u003ctd\u003e\u003ccode\u003eUZIP.js\u003c/code\u003e, 2.03x larger\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGZIP/Zlib decompression\u003c/td\u003e\n\u003ctd\u003e4kB (1kB + raw decompression)\u003c/td\u003e\n\u003ctd\u003e\u003ccode\u003epako\u003c/code\u003e, 11.4x larger\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGZIP/Zlib compression\u003c/td\u003e\n\u003ctd\u003e5kB (1kB + raw compression)\u003c/td\u003e\n\u003ctd\u003e\u003ccode\u003epako\u003c/code\u003e, 9.12x larger\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStreaming decompression\u003c/td\u003e\n\u003ctd\u003e4kB (1kB + raw decompression)\u003c/td\u003e\n\u003ctd\u003e\u003ccode\u003epako\u003c/code\u003e, 11.4x larger\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStreaming compression\u003c/td\u003e\n\u003ctd\u003e5kB (1kB + raw compression)\u003c/td\u003e\n\u003ctd\u003e\u003ccode\u003epako\u003c/code\u003e, 9.12x larger\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWhat makes \u003ccode\u003efflate\u003c/code\u003e so fast?\u003c/h2\u003e\u003ca id=\"user-content-what-makes-fflate-so-fast\" class=\"anchor\" aria-label=\"Permalink: What makes fflate so fast?\" href=\"#what-makes-fflate-so-fast\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eMany JavaScript compression/decompression libraries exist. However, the most popular one, \u003ca href=\"https://npmjs.com/package/pako\" rel=\"nofollow\"\u003e\u003ccode\u003epako\u003c/code\u003e\u003c/a\u003e, is merely a clone of Zlib rewritten nearly line-for-line in JavaScript. Although it is by no means poorly made, \u003ccode\u003epako\u003c/code\u003e doesn't recognize the many differences between JavaScript and C, and therefore is suboptimal for performance. Moreover, even when minified, the library is 45 kB; it may not seem like much, but for anyone concerned with optimizing bundle size (especially library authors), it's more weight than necessary.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eNote that there exist some small libraries like \u003ca href=\"https://npmjs.com/package/tiny-inflate\" rel=\"nofollow\"\u003e\u003ccode\u003etiny-inflate\u003c/code\u003e\u003c/a\u003e for solely decompression, and with a minified size of 3 kB, it can be appealing; however, its performance is lackluster, typically 40% worse than \u003ccode\u003epako\u003c/code\u003e in my tests.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"https://github.com/photopea/UZIP.js\"\u003e\u003ccode\u003eUZIP.js\u003c/code\u003e\u003c/a\u003e is both faster (by up to 40%) and smaller (14 kB minified) than \u003ccode\u003epako\u003c/code\u003e, and it contains a variety of innovations that make it excellent for both performance and compression ratio. However, the developer made a variety of tiny mistakes and inefficient design choices that make it imperfect. Moreover, it does not support GZIP or Zlib data directly; one must remove the headers manually to use \u003ccode\u003eUZIP.js\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSo what makes \u003ccode\u003efflate\u003c/code\u003e different? It takes the brilliant innovations of \u003ccode\u003eUZIP.js\u003c/code\u003e and optimizes them while adding direct support for GZIP and Zlib data. And unlike all of the above libraries, it uses ES Modules to allow for partial builds through tree shaking, meaning that it can rival even \u003ccode\u003etiny-inflate\u003c/code\u003e in size while maintaining excellent performance. The end result is a library that, in total, weighs 8kB minified for the core build (3kB for decompression only and 5kB for compression only), is about 15% faster than \u003ccode\u003eUZIP.js\u003c/code\u003e or up to 60% faster than \u003ccode\u003epako\u003c/code\u003e, and achieves the same or better compression ratio than the rest.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eBefore you decide that \u003ccode\u003efflate\u003c/code\u003e is the end-all compression library, you should note that JavaScript simply cannot rival the performance of a native program. If you're only using Node.js, it's probably better to use the \u003ca href=\"https://nodejs.org/api/zlib.html\" rel=\"nofollow\"\u003enative Zlib bindings\u003c/a\u003e, which tend to offer the best performance. Though note that even against Zlib, \u003ccode\u003efflate\u003c/code\u003e is only around 30% slower in decompression and 10% slower in compression, and can still achieve better compression ratios!\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWhat about \u003ccode\u003eCompressionStream\u003c/code\u003e?\u003c/h2\u003e\u003ca id=\"user-content-what-about-compressionstream\" class=\"anchor\" aria-label=\"Permalink: What about CompressionStream?\" href=\"#what-about-compressionstream\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eLike \u003ccode\u003efflate\u003c/code\u003e, the \u003ca href=\"https://developer.mozilla.org/en-US/docs/Web/API/Compression_Streams_API\" rel=\"nofollow\"\u003eCompression Streams API\u003c/a\u003e provides DEFLATE, GZIP, and Zlib compression and decompression support. It's a good option if you'd like to compress or decompress data without installing any third-party libraries, and it wraps native Zlib bindings to achieve better performance than what most JavaScript programs can achieve.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eHowever, browsers do not offer any native non-streaming compression API, and \u003ccode\u003eCompressionStream\u003c/code\u003e has surprisingly poor performance on data already loaded into memory; \u003ccode\u003efflate\u003c/code\u003e tends to be faster even for files that are dozens of megabytes large. Similarly, \u003ccode\u003efflate\u003c/code\u003e is much faster for files under a megabyte because it avoids marshalling overheads. Even when streaming hundreds of megabytes of data, the native API usually performs between 30% faster and 10% slower than \u003ccode\u003efflate\u003c/code\u003e. And Compression Streams have many other disadvantages - no ability to control compression level, poor support for older browsers, no ZIP support, etc.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf you'd still prefer to depend upon a native browser API but want to support older browsers, you can use an \u003ccode\u003efflate\u003c/code\u003e-based \u003ca href=\"https://github.com/101arrowz/compression-streams-polyfill\"\u003eCompression Streams ponyfill\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBrowser support\u003c/h2\u003e\u003ca id=\"user-content-browser-support\" class=\"anchor\" aria-label=\"Permalink: Browser support\" href=\"#browser-support\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003efflate\u003c/code\u003e makes heavy use of typed arrays (\u003ccode\u003eUint8Array\u003c/code\u003e, \u003ccode\u003eUint16Array\u003c/code\u003e, etc.). Typed arrays can be polyfilled at the cost of performance, but the most recent browser that doesn't support them \u003ca href=\"https://caniuse.com/typedarrays\" rel=\"nofollow\"\u003eis from 2011\u003c/a\u003e, so I wouldn't bother.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe asynchronous APIs also use \u003ccode\u003eWorker\u003c/code\u003e, which is not supported in a few browsers (however, the vast majority of browsers that support typed arrays support \u003ccode\u003eWorker\u003c/code\u003e).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eOther than that, \u003ccode\u003efflate\u003c/code\u003e is completely ES3, meaning you probably won't even need a bundler to use it.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eTesting\u003c/h2\u003e\u003ca id=\"user-content-testing\" class=\"anchor\" aria-label=\"Permalink: Testing\" href=\"#testing\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eYou can validate the performance of \u003ccode\u003efflate\u003c/code\u003e with \u003ccode\u003enpm test\u003c/code\u003e. It validates that the module is working as expected, ensures the outputs are no more than 5% larger than competitors at max compression, and outputs performance metrics to \u003ccode\u003etest/results\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eNote that the time it takes for the CLI to show the completion of each test is not representative of the time each package took, so please check the JSON output if you want accurate measurements.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLicense\u003c/h2\u003e\u003ca id=\"user-content-license\" class=\"anchor\" aria-label=\"Permalink: License\" href=\"#license\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis software is \u003ca href=\"/101arrowz/fflate/blob/master/LICENSE\"\u003eMIT Licensed\u003c/a\u003e, with special exemptions for projects\nand organizations as noted below:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/SheetJS/\"\u003eSheetJS\u003c/a\u003e is exempt from MIT licensing and may\nlicense any source code from this software under the BSD Zero Clause License\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/article\u003e","loaded":true,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":[{"level":1,"text":"fflate","anchor":"fflate","htmlText":"fflate"},{"level":2,"text":"Why fflate?","anchor":"why-fflate","htmlText":"Why fflate?"},{"level":2,"text":"Demo","anchor":"demo","htmlText":"Demo"},{"level":2,"text":"Usage","anchor":"usage","htmlText":"Usage"},{"level":2,"text":"Bundle size estimates","anchor":"bundle-size-estimates","htmlText":"Bundle size estimates"},{"level":2,"text":"What makes fflate so fast?","anchor":"what-makes-fflate-so-fast","htmlText":"What makes fflate so fast?"},{"level":2,"text":"What about CompressionStream?","anchor":"what-about-compressionstream","htmlText":"What about CompressionStream?"},{"level":2,"text":"Browser support","anchor":"browser-support","htmlText":"Browser support"},{"level":2,"text":"Testing","anchor":"testing","htmlText":"Testing"},{"level":2,"text":"License","anchor":"license","htmlText":"License"}],"siteNavLoginPath":"/login?return_to=https%3A%2F%2Fgithub.com%2F101arrowz%2Ffflate"}},{"displayName":"LICENSE","repoName":"fflate","refName":"master","path":"LICENSE","preferredFileType":"license","tabName":"MIT","richText":null,"loaded":false,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":null,"siteNavLoginPath":"/login?return_to=https%3A%2F%2Fgithub.com%2F101arrowz%2Ffflate"}}],"overviewFilesProcessingTime":0}},"appPayload":{"helpUrl":"https://docs.github.com","findFileWorkerPath":"/assets-cdn/worker/find-file-worker-7d7eb7c71814.js","findInFileWorkerPath":"/assets-cdn/worker/find-in-file-worker-708ec8ade250.js","githubDevUrl":null,"enabled_features":{"copilot_workspace":null,"code_nav_ui_events":false,"overview_shared_code_dropdown_button":false,"react_blob_overlay":false,"accessible_code_button":true,"github_models_repo_integration":false}}}}</script> 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itemprop="text"><div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">fflate</h1><a id="user-content-fflate" class="anchor" aria-label="Permalink: fflate" href="#fflate"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">High performance (de)compression in an 8kB package</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Why fflate?</h2><a id="user-content-why-fflate" class="anchor" aria-label="Permalink: Why fflate?" href="#why-fflate"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><code>fflate</code> (short for fast flate) is the <strong>fastest, smallest, and most versatile</strong> pure JavaScript compression and decompression library in existence, handily beating <a href="https://npmjs.com/package/pako" rel="nofollow"><code>pako</code></a>, <a href="https://npmjs.com/package/tiny-inflate" rel="nofollow"><code>tiny-inflate</code></a>, and <a href="https://github.com/photopea/UZIP.js"><code>UZIP.js</code></a> in performance benchmarks while being multiple times more lightweight. Its compression ratios are often better than even the original Zlib C library. It includes support for DEFLATE, GZIP, and Zlib data. Data compressed by <code>fflate</code> can be decompressed by other tools, and vice versa.</p> <p dir="auto">In addition to the base decompression and compression APIs, <code>fflate</code> supports high-speed ZIP file archiving for an extra 3 kB. In fact, the compressor, in synchronous mode, compresses both more quickly and with a higher compression ratio than most compression software (even Info-ZIP, a C program), and in asynchronous mode it can utilize multiple threads to achieve over 3x the performance of virtually any other utility.</p> <markdown-accessiblity-table><table> <thead> <tr> <th></th> <th><code>pako</code></th> <th><code>tiny-inflate</code></th> <th><code>UZIP.js</code></th> <th><code>fflate</code></th> </tr> </thead> <tbody> <tr> <td>Decompression performance</td> <td>1x</td> <td>Up to 40% slower</td> <td><strong>Up to 40% faster</strong></td> <td><strong>Up to 40% faster</strong></td> </tr> <tr> <td>Compression performance</td> <td>1x</td> <td>N/A</td> <td>Up to 25% faster</td> <td><strong>Up to 50% faster</strong></td> </tr> <tr> <td>Base bundle size (minified)</td> <td>45.6kB</td> <td><strong>3kB (inflate only)</strong></td> <td>14.2kB</td> <td>8kB <strong>(3kB for inflate only)</strong></td> </tr> <tr> <td>Decompression support</td> <td>✅</td> <td>✅</td> <td>✅</td> <td>✅</td> </tr> <tr> <td>Compression support</td> <td>✅</td> <td>❌</td> <td>✅</td> <td>✅</td> </tr> <tr> <td>ZIP support</td> <td>❌</td> <td>❌</td> <td>✅</td> <td>✅</td> </tr> <tr> <td>Streaming support</td> <td>✅</td> <td>❌</td> <td>❌</td> <td>✅</td> </tr> <tr> <td>GZIP support</td> <td>✅</td> <td>❌</td> <td>❌</td> <td>✅</td> </tr> <tr> <td>Supports files up to 4GB</td> <td>✅</td> <td>❌</td> <td>❌</td> <td>✅</td> </tr> <tr> <td>Doesn't hang on error</td> <td>✅</td> <td>❌</td> <td>❌</td> <td>✅</td> </tr> <tr> <td>Dictionary support</td> <td>✅</td> <td>❌</td> <td>❌</td> <td>✅</td> </tr> <tr> <td>Multi-thread/Asynchronous</td> <td>❌</td> <td>❌</td> <td>❌</td> <td>✅</td> </tr> <tr> <td>Streaming ZIP support</td> <td>❌</td> <td>❌</td> <td>❌</td> <td>✅</td> </tr> <tr> <td>Uses ES Modules</td> <td>❌</td> <td>❌</td> <td>❌</td> <td>✅</td> </tr> </tbody> </table></markdown-accessiblity-table> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Demo</h2><a id="user-content-demo" class="anchor" aria-label="Permalink: Demo" href="#demo"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">If you'd like to try <code>fflate</code> for yourself without installing it, you can take a look at the <a href="https://101arrowz.github.io/fflate" rel="nofollow">browser demo</a>. Since <code>fflate</code> is a pure JavaScript library, it works in both the browser and Node.js (see <a href="https://github.com/101arrowz/fflate/#browser-support">Browser support</a> for more info).</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Usage</h2><a id="user-content-usage" class="anchor" aria-label="Permalink: Usage" href="#usage"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Install <code>fflate</code>:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="npm i fflate # or yarn add fflate, or pnpm add fflate"><pre>npm i fflate <span class="pl-c"><span class="pl-c">#</span> or yarn add fflate, or pnpm add fflate</span></pre></div> <p dir="auto">Import:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="// I will assume that you use the following for the rest of this guide import * as fflate from 'fflate'; // However, you should import ONLY what you need to minimize bloat. // So, if you just need GZIP compression support: import { gzipSync } from 'fflate'; // Woo! You just saved 20 kB off your bundle with one line."><pre><span class="pl-c">// I will assume that you use the following for the rest of this guide</span> <span class="pl-k">import</span> <span class="pl-c1">*</span> <span class="pl-k">as</span> <span class="pl-s1">fflate</span> <span class="pl-k">from</span> <span class="pl-s">'fflate'</span><span class="pl-kos">;</span> <span class="pl-c">// However, you should import ONLY what you need to minimize bloat.</span> <span class="pl-c">// So, if you just need GZIP compression support:</span> <span class="pl-k">import</span> <span class="pl-kos">{</span> <span class="pl-s1">gzipSync</span> <span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'fflate'</span><span class="pl-kos">;</span> <span class="pl-c">// Woo! You just saved 20 kB off your bundle with one line.</span></pre></div> <p dir="auto">If your environment doesn't support ES Modules (e.g. Node.js):</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="// Try to avoid this when using fflate in the browser, as it will import // all of fflate's components, even those that you aren't using. const fflate = require('fflate');"><pre><span class="pl-c">// Try to avoid this when using fflate in the browser, as it will import</span> <span class="pl-c">// all of fflate's components, even those that you aren't using.</span> <span class="pl-k">const</span> <span class="pl-s1">fflate</span> <span class="pl-c1">=</span> <span class="pl-en">require</span><span class="pl-kos">(</span><span class="pl-s">'fflate'</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <p dir="auto">If you want to load from a CDN in the browser:</p> <div class="highlight highlight-text-html-basic notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="<!-- You should use either UNPKG or jsDelivr (i.e. only one of the following) Note that tree shaking is completely unsupported from the CDN. If you want a small build without build tools, please ask me and I will make one manually with only the features you need. This build is about 31kB, or 11.5kB gzipped. --> <script src="https://unpkg.com/fflate@0.8.2"></script> <script src="https://cdn.jsdelivr.net/npm/fflate@0.8.2/umd/index.js"></script> <!-- Now, the global variable fflate contains the library --> <!-- If you're going buildless but want ESM, import from Skypack --> <script type="module"> import * as fflate from 'https://cdn.skypack.dev/fflate@0.8.2?min'; </script>"><pre><span class="pl-c"><!--</span> <span class="pl-c">You should use either UNPKG or jsDelivr (i.e. only one of the following)</span> <span class="pl-c"></span> <span class="pl-c">Note that tree shaking is completely unsupported from the CDN. If you want</span> <span class="pl-c">a small build without build tools, please ask me and I will make one manually</span> <span class="pl-c">with only the features you need. This build is about 31kB, or 11.5kB gzipped.</span> <span class="pl-c">--></span> <span class="pl-kos"><</span><span class="pl-ent">script</span> <span class="pl-c1">src</span>="<span class="pl-s">https://unpkg.com/fflate@0.8.2</span>"<span class="pl-kos">></span><span class="pl-kos"></</span><span class="pl-ent">script</span><span class="pl-kos">></span> <span class="pl-kos"><</span><span class="pl-ent">script</span> <span class="pl-c1">src</span>="<span class="pl-s">https://cdn.jsdelivr.net/npm/fflate@0.8.2/umd/index.js</span>"<span class="pl-kos">></span><span class="pl-kos"></</span><span class="pl-ent">script</span><span class="pl-kos">></span> <span class="pl-c"><!-- Now, the global variable fflate contains the library --></span> <span class="pl-c"><!-- If you're going buildless but want ESM, import from Skypack --></span> <span class="pl-kos"><</span><span class="pl-ent">script</span> <span class="pl-c1">type</span>="<span class="pl-s">module</span>"<span class="pl-kos">></span> <span class="pl-k">import</span> <span class="pl-c1">*</span> <span class="pl-k">as</span> <span class="pl-s1">fflate</span> <span class="pl-k">from</span> <span class="pl-s">'https://cdn.skypack.dev/fflate@0.8.2?min'</span><span class="pl-kos">;</span> <span class="pl-kos"></</span><span class="pl-ent">script</span><span class="pl-kos">></span></pre></div> <p dir="auto">If you are using Deno:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="// Don't use the ?dts Skypack flag; it isn't necessary for Deno support // The @deno-types comment adds TypeScript typings // @deno-types="https://cdn.skypack.dev/fflate@0.8.2/lib/index.d.ts" import * as fflate from 'https://cdn.skypack.dev/fflate@0.8.2?min';"><pre><span class="pl-c">// Don't use the ?dts Skypack flag; it isn't necessary for Deno support</span> <span class="pl-c">// The <span class="pl-k">@deno</span>-types comment adds TypeScript typings</span> <span class="pl-c">// <span class="pl-k">@deno</span>-types="https://cdn.skypack.dev/fflate@0.8.2/lib/index.d.ts"</span> <span class="pl-k">import</span> <span class="pl-c1">*</span> <span class="pl-k">as</span> <span class="pl-s1">fflate</span> <span class="pl-k">from</span> <span class="pl-s">'https://cdn.skypack.dev/fflate@0.8.2?min'</span><span class="pl-kos">;</span></pre></div> <p dir="auto">If your environment doesn't support bundling:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="// Again, try to import just what you need // For the browser: import * as fflate from 'fflate/esm/browser.js'; // If the standard ESM import fails on Node (i.e. older version): import * as fflate from 'fflate/esm';"><pre><span class="pl-c">// Again, try to import just what you need</span> <span class="pl-c">// For the browser:</span> <span class="pl-k">import</span> <span class="pl-c1">*</span> <span class="pl-k">as</span> <span class="pl-s1">fflate</span> <span class="pl-k">from</span> <span class="pl-s">'fflate/esm/browser.js'</span><span class="pl-kos">;</span> <span class="pl-c">// If the standard ESM import fails on Node (i.e. older version):</span> <span class="pl-k">import</span> <span class="pl-c1">*</span> <span class="pl-k">as</span> <span class="pl-s1">fflate</span> <span class="pl-k">from</span> <span class="pl-s">'fflate/esm'</span><span class="pl-kos">;</span></pre></div> <p dir="auto">And use:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="// This is an ArrayBuffer of data const massiveFileBuf = await fetch('/aMassiveFile').then( res => res.arrayBuffer() ); // To use fflate, you need a Uint8Array const massiveFile = new Uint8Array(massiveFileBuf); // Note that Node.js Buffers work just fine as well: // const massiveFile = require('fs').readFileSync('aMassiveFile.txt'); // Higher level means lower performance but better compression // The level ranges from 0 (no compression) to 9 (max compression) // The default level is 6 const notSoMassive = fflate.zlibSync(massiveFile, { level: 9 }); const massiveAgain = fflate.unzlibSync(notSoMassive); const gzipped = fflate.gzipSync(massiveFile, { // GZIP-specific: the filename to use when decompressed filename: 'aMassiveFile.txt', // GZIP-specific: the modification time. Can be a Date, date string, // or Unix timestamp mtime: '9/1/16 2:00 PM' });"><pre><span class="pl-c">// This is an ArrayBuffer of data</span> <span class="pl-k">const</span> <span class="pl-s1">massiveFileBuf</span> <span class="pl-c1">=</span> <span class="pl-k">await</span> <span class="pl-en">fetch</span><span class="pl-kos">(</span><span class="pl-s">'/aMassiveFile'</span><span class="pl-kos">)</span><span class="pl-kos">.</span><span class="pl-en">then</span><span class="pl-kos">(</span> <span class="pl-s1">res</span> <span class="pl-c1">=></span> <span class="pl-s1">res</span><span class="pl-kos">.</span><span class="pl-en">arrayBuffer</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// To use fflate, you need a Uint8Array</span> <span class="pl-k">const</span> <span class="pl-s1">massiveFile</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-v">Uint8Array</span><span class="pl-kos">(</span><span class="pl-s1">massiveFileBuf</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// Note that Node.js Buffers work just fine as well:</span> <span class="pl-c">// const massiveFile = require('fs').readFileSync('aMassiveFile.txt');</span> <span class="pl-c">// Higher level means lower performance but better compression</span> <span class="pl-c">// The level ranges from 0 (no compression) to 9 (max compression)</span> <span class="pl-c">// The default level is 6</span> <span class="pl-k">const</span> <span class="pl-s1">notSoMassive</span> <span class="pl-c1">=</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-en">zlibSync</span><span class="pl-kos">(</span><span class="pl-s1">massiveFile</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">level</span>: <span class="pl-c1">9</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">massiveAgain</span> <span class="pl-c1">=</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-en">unzlibSync</span><span class="pl-kos">(</span><span class="pl-s1">notSoMassive</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">gzipped</span> <span class="pl-c1">=</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-en">gzipSync</span><span class="pl-kos">(</span><span class="pl-s1">massiveFile</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c">// GZIP-specific: the filename to use when decompressed</span> <span class="pl-c1">filename</span>: <span class="pl-s">'aMassiveFile.txt'</span><span class="pl-kos">,</span> <span class="pl-c">// GZIP-specific: the modification time. Can be a Date, date string,</span> <span class="pl-c">// or Unix timestamp</span> <span class="pl-c1">mtime</span>: <span class="pl-s">'9/1/16 2:00 PM'</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <p dir="auto"><code>fflate</code> can autodetect a compressed file's format as well:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="const compressed = new Uint8Array( await fetch('/GZIPorZLIBorDEFLATE').then(res => res.arrayBuffer()) ); // Above example with Node.js Buffers: // Buffer.from('H4sIAAAAAAAAE8tIzcnJBwCGphA2BQAAAA==', 'base64'); const decompressed = fflate.decompressSync(compressed);"><pre><span class="pl-k">const</span> <span class="pl-s1">compressed</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-v">Uint8Array</span><span class="pl-kos">(</span> <span class="pl-k">await</span> <span class="pl-en">fetch</span><span class="pl-kos">(</span><span class="pl-s">'/GZIPorZLIBorDEFLATE'</span><span class="pl-kos">)</span><span class="pl-kos">.</span><span class="pl-en">then</span><span class="pl-kos">(</span><span class="pl-s1">res</span> <span class="pl-c1">=></span> <span class="pl-s1">res</span><span class="pl-kos">.</span><span class="pl-en">arrayBuffer</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">)</span> <span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// Above example with Node.js Buffers:</span> <span class="pl-c">// Buffer.from('H4sIAAAAAAAAE8tIzcnJBwCGphA2BQAAAA==', 'base64');</span> <span class="pl-k">const</span> <span class="pl-s1">decompressed</span> <span class="pl-c1">=</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-en">decompressSync</span><span class="pl-kos">(</span><span class="pl-s1">compressed</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <p dir="auto">Using strings is easy with <code>fflate</code>'s string conversion API:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="const buf = fflate.strToU8('Hello world!'); // The default compression method is gzip // Increasing mem may increase performance at the cost of memory // The mem ranges from 0 to 12, where 4 is the default const compressed = fflate.compressSync(buf, { level: 6, mem: 8 }); // When you need to decompress: const decompressed = fflate.decompressSync(compressed); const origText = fflate.strFromU8(decompressed); console.log(origText); // Hello world!"><pre><span class="pl-k">const</span> <span class="pl-s1">buf</span> <span class="pl-c1">=</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-en">strToU8</span><span class="pl-kos">(</span><span class="pl-s">'Hello world!'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// The default compression method is gzip</span> <span class="pl-c">// Increasing mem may increase performance at the cost of memory</span> <span class="pl-c">// The mem ranges from 0 to 12, where 4 is the default</span> <span class="pl-k">const</span> <span class="pl-s1">compressed</span> <span class="pl-c1">=</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-en">compressSync</span><span class="pl-kos">(</span><span class="pl-s1">buf</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">level</span>: <span class="pl-c1">6</span><span class="pl-kos">,</span> <span class="pl-c1">mem</span>: <span class="pl-c1">8</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// When you need to decompress:</span> <span class="pl-k">const</span> <span class="pl-s1">decompressed</span> <span class="pl-c1">=</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-en">decompressSync</span><span class="pl-kos">(</span><span class="pl-s1">compressed</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">origText</span> <span class="pl-c1">=</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-en">strFromU8</span><span class="pl-kos">(</span><span class="pl-s1">decompressed</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-s1">origText</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// Hello world!</span></pre></div> <p dir="auto">If you need to use an (albeit inefficient) binary string, you can set the second argument to <code>true</code>.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="const buf = fflate.strToU8('Hello world!'); // The second argument, latin1, is a boolean that indicates that the data // is not Unicode but rather should be encoded and decoded as Latin-1. // This is useful for creating a string from binary data that isn't // necessarily valid UTF-8. However, binary strings are incredibly // inefficient and tend to double file size, so they're not recommended. const compressedString = fflate.strFromU8( fflate.compressSync(buf), true ); const decompressed = fflate.decompressSync( fflate.strToU8(compressedString, true) ); const origText = fflate.strFromU8(decompressed); console.log(origText); // Hello world!"><pre><span class="pl-k">const</span> <span class="pl-s1">buf</span> <span class="pl-c1">=</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-en">strToU8</span><span class="pl-kos">(</span><span class="pl-s">'Hello world!'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// The second argument, latin1, is a boolean that indicates that the data</span> <span class="pl-c">// is not Unicode but rather should be encoded and decoded as Latin-1.</span> <span class="pl-c">// This is useful for creating a string from binary data that isn't</span> <span class="pl-c">// necessarily valid UTF-8. However, binary strings are incredibly</span> <span class="pl-c">// inefficient and tend to double file size, so they're not recommended.</span> <span class="pl-k">const</span> <span class="pl-s1">compressedString</span> <span class="pl-c1">=</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-en">strFromU8</span><span class="pl-kos">(</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-en">compressSync</span><span class="pl-kos">(</span><span class="pl-s1">buf</span><span class="pl-kos">)</span><span class="pl-kos">,</span> <span class="pl-c1">true</span> <span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">decompressed</span> <span class="pl-c1">=</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-en">decompressSync</span><span class="pl-kos">(</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-en">strToU8</span><span class="pl-kos">(</span><span class="pl-s1">compressedString</span><span class="pl-kos">,</span> <span class="pl-c1">true</span><span class="pl-kos">)</span> <span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">origText</span> <span class="pl-c1">=</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-en">strFromU8</span><span class="pl-kos">(</span><span class="pl-s1">decompressed</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-s1">origText</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// Hello world!</span></pre></div> <p dir="auto">You can use streams as well to incrementally add data to be compressed or decompressed:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="// This example uses synchronous streams, but for the best experience // you'll definitely want to use asynchronous streams. let outStr = ''; const gzipStream = new fflate.Gzip({ level: 9 }, (chunk, isLast) => { // accumulate in an inefficient binary string (just an example) outStr += fflate.strFromU8(chunk, true); }); // You can also attach the data handler separately if you don't want to // do so in the constructor. gzipStream.ondata = (chunk, final) => { ... } // Since this is synchronous, all errors will be thrown by stream.push() gzipStream.push(chunk1); gzipStream.push(chunk2); ... // You should mark the last chunk by using true in the second argument // In addition to being necessary for the stream to work properly, this // will also set the isLast parameter in the handler to true. gzipStream.push(lastChunk, true); console.log(outStr); // The compressed binary string is now available // The options parameter for compression streams is optional; you can // provide one parameter (the handler) or none at all if you set // deflateStream.ondata later. const deflateStream = new fflate.Deflate((chunk, final) => { console.log(chunk, final); }); // If you want to create a stream from strings, use EncodeUTF8 const utfEncode = new fflate.EncodeUTF8((data, final) => { // Chaining streams together is done by pushing to the // next stream in the handler for the previous stream deflateStream.push(data, final); }); utfEncode.push('Hello'.repeat(1000)); utfEncode.push(' '.repeat(100)); utfEncode.push('world!'.repeat(10), true); // The deflateStream has logged the compressed data const inflateStream = new fflate.Inflate(); inflateStream.ondata = (decompressedChunk, final) => { ... }; let stringData = ''; // Streaming UTF-8 decode is available too const utfDecode = new fflate.DecodeUTF8((data, final) => { stringData += data; }); // Decompress streams auto-detect the compression method, as the // non-streaming decompress() method does. const dcmpStrm = new fflate.Decompress((chunk, final) => { console.log(chunk, 'was encoded with GZIP, Zlib, or DEFLATE'); utfDecode.push(chunk, final); }); dcmpStrm.push(zlibJSONData1); dcmpStrm.push(zlibJSONData2, true); // This succeeds; the UTF-8 decoder chained with the unknown compression format // stream to reach a string as a sink. console.log(JSON.parse(stringData));"><pre><span class="pl-c">// This example uses synchronous streams, but for the best experience</span> <span class="pl-c">// you'll definitely want to use asynchronous streams.</span> <span class="pl-k">let</span> <span class="pl-s1">outStr</span> <span class="pl-c1">=</span> <span class="pl-s">''</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">gzipStream</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-c1">Gzip</span><span class="pl-kos">(</span><span class="pl-kos">{</span> <span class="pl-c1">level</span>: <span class="pl-c1">9</span> <span class="pl-kos">}</span><span class="pl-kos">,</span> <span class="pl-kos">(</span><span class="pl-s1">chunk</span><span class="pl-kos">,</span> <span class="pl-s1">isLast</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-kos">{</span> <span class="pl-c">// accumulate in an inefficient binary string (just an example)</span> <span class="pl-s1">outStr</span> <span class="pl-c1">+=</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-en">strFromU8</span><span class="pl-kos">(</span><span class="pl-s1">chunk</span><span class="pl-kos">,</span> <span class="pl-c1">true</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// You can also attach the data handler separately if you don't want to</span> <span class="pl-c">// do so in the constructor.</span> <span class="pl-s1">gzipStream</span><span class="pl-kos">.</span><span class="pl-en">ondata</span> <span class="pl-c1">=</span> <span class="pl-kos">(</span><span class="pl-s1">chunk</span><span class="pl-kos">,</span> <span class="pl-s1">final</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-kos">{</span> ... <span class="pl-kos">}</span> <span class="pl-c">// Since this is synchronous, all errors will be thrown by stream.push()</span> <span class="pl-s1">gzipStream</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-s1">chunk1</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">gzipStream</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-s1">chunk2</span><span class="pl-kos">)</span><span class="pl-kos">;</span> ... <span class="pl-c">// You should mark the last chunk by using true in the second argument</span> <span class="pl-c">// In addition to being necessary for the stream to work properly, this</span> <span class="pl-c">// will also set the isLast parameter in the handler to true.</span> <span class="pl-s1">gzipStream</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-s1">lastChunk</span><span class="pl-kos">,</span> <span class="pl-c1">true</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-s1">outStr</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// The compressed binary string is now available</span> <span class="pl-c">// The options parameter for compression streams is optional; you can</span> <span class="pl-c">// provide one parameter (the handler) or none at all if you set</span> <span class="pl-c">// deflateStream.ondata later.</span> <span class="pl-k">const</span> <span class="pl-s1">deflateStream</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-c1">Deflate</span><span class="pl-kos">(</span><span class="pl-kos">(</span><span class="pl-s1">chunk</span><span class="pl-kos">,</span> <span class="pl-s1">final</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-kos">{</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-s1">chunk</span><span class="pl-kos">,</span> <span class="pl-s1">final</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// If you want to create a stream from strings, use EncodeUTF8</span> <span class="pl-k">const</span> <span class="pl-s1">utfEncode</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-c1">EncodeUTF8</span><span class="pl-kos">(</span><span class="pl-kos">(</span><span class="pl-s1">data</span><span class="pl-kos">,</span> <span class="pl-s1">final</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-kos">{</span> <span class="pl-c">// Chaining streams together is done by pushing to the</span> <span class="pl-c">// next stream in the handler for the previous stream</span> <span class="pl-s1">deflateStream</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-s1">data</span><span class="pl-kos">,</span> <span class="pl-s1">final</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">utfEncode</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-s">'Hello'</span><span class="pl-kos">.</span><span class="pl-en">repeat</span><span class="pl-kos">(</span><span class="pl-c1">1000</span><span class="pl-kos">)</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">utfEncode</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-s">' '</span><span class="pl-kos">.</span><span class="pl-en">repeat</span><span class="pl-kos">(</span><span class="pl-c1">100</span><span class="pl-kos">)</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">utfEncode</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-s">'world!'</span><span class="pl-kos">.</span><span class="pl-en">repeat</span><span class="pl-kos">(</span><span class="pl-c1">10</span><span class="pl-kos">)</span><span class="pl-kos">,</span> <span class="pl-c1">true</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// The deflateStream has logged the compressed data</span> <span class="pl-k">const</span> <span class="pl-s1">inflateStream</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-c1">Inflate</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">inflateStream</span><span class="pl-kos">.</span><span class="pl-en">ondata</span> <span class="pl-c1">=</span> <span class="pl-kos">(</span><span class="pl-s1">decompressedChunk</span><span class="pl-kos">,</span> <span class="pl-s1">final</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-kos">{</span> ... <span class="pl-kos">}</span><span class="pl-kos">;</span> <span class="pl-k">let</span> <span class="pl-s1">stringData</span> <span class="pl-c1">=</span> <span class="pl-s">''</span><span class="pl-kos">;</span> <span class="pl-c">// Streaming UTF-8 decode is available too</span> <span class="pl-k">const</span> <span class="pl-s1">utfDecode</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-c1">DecodeUTF8</span><span class="pl-kos">(</span><span class="pl-kos">(</span><span class="pl-s1">data</span><span class="pl-kos">,</span> <span class="pl-s1">final</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-kos">{</span> <span class="pl-s1">stringData</span> <span class="pl-c1">+=</span> <span class="pl-s1">data</span><span class="pl-kos">;</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// Decompress streams auto-detect the compression method, as the</span> <span class="pl-c">// non-streaming decompress() method does.</span> <span class="pl-k">const</span> <span class="pl-s1">dcmpStrm</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-c1">Decompress</span><span class="pl-kos">(</span><span class="pl-kos">(</span><span class="pl-s1">chunk</span><span class="pl-kos">,</span> <span class="pl-s1">final</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-kos">{</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-s1">chunk</span><span class="pl-kos">,</span> <span class="pl-s">'was encoded with GZIP, Zlib, or DEFLATE'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">utfDecode</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-s1">chunk</span><span class="pl-kos">,</span> <span class="pl-s1">final</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">dcmpStrm</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-s1">zlibJSONData1</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">dcmpStrm</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-s1">zlibJSONData2</span><span class="pl-kos">,</span> <span class="pl-c1">true</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// This succeeds; the UTF-8 decoder chained with the unknown compression format</span> <span class="pl-c">// stream to reach a string as a sink.</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-c1">JSON</span><span class="pl-kos">.</span><span class="pl-en">parse</span><span class="pl-kos">(</span><span class="pl-s1">stringData</span><span class="pl-kos">)</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <p dir="auto">You can create multi-file ZIP archives easily as well. Note that by default, compression is enabled for all files, which is not useful when ZIPping many PNGs, JPEGs, PDFs, etc. because those formats are already compressed. You should either override the level on a per-file basis or globally to avoid wasting resources.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="// Note that the asynchronous version (see below) runs in parallel and // is *much* (up to 3x) faster for larger archives. const zipped = fflate.zipSync({ // Directories can be nested structures, as in an actual filesystem 'dir1': { 'nested': { // You can use Unicode in filenames '你好.txt': fflate.strToU8('Hey there!') }, // You can also manually write out a directory path 'other/tmp.txt': new Uint8Array([97, 98, 99, 100]) }, // You can also provide compression options 'massiveImage.bmp': [aMassiveFile, { level: 9, mem: 12 }], // PNG is pre-compressed; no need to waste time 'superTinyFile.png': [aPNGFile, { level: 0 }], // Directories take options too 'exec': [{ 'hello.sh': [fflate.strToU8('echo hello world'), { // ZIP only: Set the operating system to Unix os: 3, // ZIP only: Make this file executable on Unix attrs: 0o755 << 16 }] }, { // ZIP and GZIP support mtime (defaults to current time) mtime: new Date('10/20/2020') }] }, { // These options are the defaults for all files, but file-specific // options take precedence. level: 1, // Obfuscate last modified time by default mtime: new Date('1/1/1980') }); // If you write the zipped data to myzip.zip and unzip, the folder // structure will be outputted as: // myzip.zip (original file) // dir1 // |-> nested // | |-> 你好.txt // |-> other // | |-> tmp.txt // massiveImage.bmp // superTinyFile.png // When decompressing, folders are not nested; all filepaths are fully // written out in the keys. For example, the return value may be: // { 'nested/directory/structure.txt': Uint8Array(2) [97, 97] } const decompressed = fflate.unzipSync(zipped, { // You may optionally supply a filter for files. By default, all files in a // ZIP archive are extracted, but a filter can save resources by telling // the library not to decompress certain files filter(file) { // Don't decompress the massive image or any files larger than 10 MiB return file.name != 'massiveImage.bmp' && file.originalSize <= 10_000_000; } });"><pre><span class="pl-c">// Note that the asynchronous version (see below) runs in parallel and</span> <span class="pl-c">// is *much* (up to 3x) faster for larger archives.</span> <span class="pl-k">const</span> <span class="pl-s1">zipped</span> <span class="pl-c1">=</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-en">zipSync</span><span class="pl-kos">(</span><span class="pl-kos">{</span> <span class="pl-c">// Directories can be nested structures, as in an actual filesystem</span> <span class="pl-s">'dir1'</span>: <span class="pl-kos">{</span> <span class="pl-s">'nested'</span>: <span class="pl-kos">{</span> <span class="pl-c">// You can use Unicode in filenames</span> <span class="pl-s">'你好.txt'</span>: <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-en">strToU8</span><span class="pl-kos">(</span><span class="pl-s">'Hey there!'</span><span class="pl-kos">)</span> <span class="pl-kos">}</span><span class="pl-kos">,</span> <span class="pl-c">// You can also manually write out a directory path</span> <span class="pl-s">'other/tmp.txt'</span>: <span class="pl-k">new</span> <span class="pl-v">Uint8Array</span><span class="pl-kos">(</span><span class="pl-kos">[</span><span class="pl-c1">97</span><span class="pl-kos">,</span> <span class="pl-c1">98</span><span class="pl-kos">,</span> <span class="pl-c1">99</span><span class="pl-kos">,</span> <span class="pl-c1">100</span><span class="pl-kos">]</span><span class="pl-kos">)</span> <span class="pl-kos">}</span><span class="pl-kos">,</span> <span class="pl-c">// You can also provide compression options</span> <span class="pl-s">'massiveImage.bmp'</span>: <span class="pl-kos">[</span><span class="pl-s1">aMassiveFile</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">level</span>: <span class="pl-c1">9</span><span class="pl-kos">,</span> <span class="pl-c1">mem</span>: <span class="pl-c1">12</span> <span class="pl-kos">}</span><span class="pl-kos">]</span><span class="pl-kos">,</span> <span class="pl-c">// PNG is pre-compressed; no need to waste time</span> <span class="pl-s">'superTinyFile.png'</span>: <span class="pl-kos">[</span><span class="pl-s1">aPNGFile</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">level</span>: <span class="pl-c1">0</span> <span class="pl-kos">}</span><span class="pl-kos">]</span><span class="pl-kos">,</span> <span class="pl-c">// Directories take options too</span> <span class="pl-s">'exec'</span>: <span class="pl-kos">[</span><span class="pl-kos">{</span> <span class="pl-s">'hello.sh'</span>: <span class="pl-kos">[</span><span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-en">strToU8</span><span class="pl-kos">(</span><span class="pl-s">'echo hello world'</span><span class="pl-kos">)</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c">// ZIP only: Set the operating system to Unix</span> <span class="pl-c1">os</span>: <span class="pl-c1">3</span><span class="pl-kos">,</span> <span class="pl-c">// ZIP only: Make this file executable on Unix</span> <span class="pl-c1">attrs</span>: <span class="pl-c1">0o755</span> <span class="pl-c1"><<</span> <span class="pl-c1">16</span> <span class="pl-kos">}</span><span class="pl-kos">]</span> <span class="pl-kos">}</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c">// ZIP and GZIP support mtime (defaults to current time)</span> <span class="pl-c1">mtime</span>: <span class="pl-k">new</span> <span class="pl-v">Date</span><span class="pl-kos">(</span><span class="pl-s">'10/20/2020'</span><span class="pl-kos">)</span> <span class="pl-kos">}</span><span class="pl-kos">]</span> <span class="pl-kos">}</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c">// These options are the defaults for all files, but file-specific</span> <span class="pl-c">// options take precedence.</span> <span class="pl-c1">level</span>: <span class="pl-c1">1</span><span class="pl-kos">,</span> <span class="pl-c">// Obfuscate last modified time by default </span> <span class="pl-c1">mtime</span>: <span class="pl-k">new</span> <span class="pl-v">Date</span><span class="pl-kos">(</span><span class="pl-s">'1/1/1980'</span><span class="pl-kos">)</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// If you write the zipped data to myzip.zip and unzip, the folder</span> <span class="pl-c">// structure will be outputted as:</span> <span class="pl-c">// myzip.zip (original file)</span> <span class="pl-c">// dir1</span> <span class="pl-c">// |-> nested</span> <span class="pl-c">// | |-> 你好.txt</span> <span class="pl-c">// |-> other</span> <span class="pl-c">// | |-> tmp.txt</span> <span class="pl-c">// massiveImage.bmp</span> <span class="pl-c">// superTinyFile.png</span> <span class="pl-c">// When decompressing, folders are not nested; all filepaths are fully</span> <span class="pl-c">// written out in the keys. For example, the return value may be:</span> <span class="pl-c">// { 'nested/directory/structure.txt': Uint8Array(2) [97, 97] }</span> <span class="pl-k">const</span> <span class="pl-s1">decompressed</span> <span class="pl-c1">=</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-en">unzipSync</span><span class="pl-kos">(</span><span class="pl-s1">zipped</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c">// You may optionally supply a filter for files. By default, all files in a</span> <span class="pl-c">// ZIP archive are extracted, but a filter can save resources by telling</span> <span class="pl-c">// the library not to decompress certain files</span> <span class="pl-en">filter</span><span class="pl-kos">(</span><span class="pl-s1">file</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-c">// Don't decompress the massive image or any files larger than 10 MiB</span> <span class="pl-k">return</span> <span class="pl-s1">file</span><span class="pl-kos">.</span><span class="pl-c1">name</span> <span class="pl-c1">!=</span> <span class="pl-s">'massiveImage.bmp'</span> <span class="pl-c1">&&</span> <span class="pl-s1">file</span><span class="pl-kos">.</span><span class="pl-c1">originalSize</span> <span class="pl-c1"><=</span> <span class="pl-c1">10_000_000</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <p dir="auto">If you need extremely high performance or custom ZIP compression formats, you can use the highly-extensible ZIP streams. They take streams as both input and output. You can even use custom compression/decompression algorithms from other libraries, as long as they <a href="https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT" rel="nofollow">are defined in the ZIP spec</a> (see section 4.4.5). If you'd like more info on using custom compressors, <a href="https://github.com/101arrowz/fflate/discussions">feel free to ask</a>.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="// ZIP object // Can also specify zip.ondata outside of the constructor const zip = new fflate.Zip((err, dat, final) => { if (!err) { // output of the streams console.log(dat, final); } }); const helloTxt = new fflate.ZipDeflate('hello.txt', { level: 9 }); // Always add streams to ZIP archives before pushing to those streams zip.add(helloTxt); helloTxt.push(chunk1); // Last chunk helloTxt.push(chunk2, true); // ZipPassThrough is like ZipDeflate with level 0, but allows for tree shaking const nonStreamingFile = new fflate.ZipPassThrough('test.png'); zip.add(nonStreamingFile); // If you have data already loaded, just .push(data, true) nonStreamingFile.push(pngData, true); // You need to call .end() after finishing // This ensures the ZIP is valid zip.end(); // Unzip object const unzipper = new fflate.Unzip(); // This function will almost always have to be called. It is used to support // compression algorithms such as BZIP2 or LZMA in ZIP files if just DEFLATE // is not enough (though it almost always is). // If your ZIP files are not compressed, this line is not needed. unzipper.register(fflate.UnzipInflate); const neededFiles = ['file1.txt', 'example.json']; // Can specify handler in constructor too unzipper.onfile = file => { // file.name is a string, file is a stream if (neededFiles.includes(file.name)) { file.ondata = (err, dat, final) => { // Stream output here console.log(dat, final); }; console.log('Reading:', file.name); // File sizes are sometimes not set if the ZIP file did not encode // them, so you may want to check that file.size != undefined console.log('Compressed size', file.size); console.log('Decompressed size', file.originalSize); // You should only start the stream if you plan to use it to improve // performance. Only after starting the stream will ondata be called. // This method will throw if the compression method hasn't been registered file.start(); } }; // Try to keep under 5,000 files per chunk to avoid stack limit errors // For example, if all files are a few kB, multi-megabyte chunks are OK // If files are mostly under 100 bytes, 64kB chunks are the limit unzipper.push(zipChunk1); unzipper.push(zipChunk2); unzipper.push(zipChunk3, true);"><pre><span class="pl-c">// ZIP object</span> <span class="pl-c">// Can also specify zip.ondata outside of the constructor</span> <span class="pl-k">const</span> <span class="pl-s1">zip</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-c1">Zip</span><span class="pl-kos">(</span><span class="pl-kos">(</span><span class="pl-s1">err</span><span class="pl-kos">,</span> <span class="pl-s1">dat</span><span class="pl-kos">,</span> <span class="pl-s1">final</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-kos">{</span> <span class="pl-k">if</span> <span class="pl-kos">(</span><span class="pl-c1">!</span><span class="pl-s1">err</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-c">// output of the streams</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-s1">dat</span><span class="pl-kos">,</span> <span class="pl-s1">final</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">helloTxt</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-c1">ZipDeflate</span><span class="pl-kos">(</span><span class="pl-s">'hello.txt'</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">level</span>: <span class="pl-c1">9</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// Always add streams to ZIP archives before pushing to those streams</span> <span class="pl-s1">zip</span><span class="pl-kos">.</span><span class="pl-en">add</span><span class="pl-kos">(</span><span class="pl-s1">helloTxt</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">helloTxt</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-s1">chunk1</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// Last chunk</span> <span class="pl-s1">helloTxt</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-s1">chunk2</span><span class="pl-kos">,</span> <span class="pl-c1">true</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// ZipPassThrough is like ZipDeflate with level 0, but allows for tree shaking</span> <span class="pl-k">const</span> <span class="pl-s1">nonStreamingFile</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-c1">ZipPassThrough</span><span class="pl-kos">(</span><span class="pl-s">'test.png'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">zip</span><span class="pl-kos">.</span><span class="pl-en">add</span><span class="pl-kos">(</span><span class="pl-s1">nonStreamingFile</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// If you have data already loaded, just .push(data, true)</span> <span class="pl-s1">nonStreamingFile</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-s1">pngData</span><span class="pl-kos">,</span> <span class="pl-c1">true</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// You need to call .end() after finishing</span> <span class="pl-c">// This ensures the ZIP is valid</span> <span class="pl-s1">zip</span><span class="pl-kos">.</span><span class="pl-en">end</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// Unzip object</span> <span class="pl-k">const</span> <span class="pl-s1">unzipper</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-c1">Unzip</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// This function will almost always have to be called. It is used to support</span> <span class="pl-c">// compression algorithms such as BZIP2 or LZMA in ZIP files if just DEFLATE</span> <span class="pl-c">// is not enough (though it almost always is).</span> <span class="pl-c">// If your ZIP files are not compressed, this line is not needed.</span> <span class="pl-s1">unzipper</span><span class="pl-kos">.</span><span class="pl-en">register</span><span class="pl-kos">(</span><span class="pl-s1">fflate</span><span class="pl-kos">.</span><span class="pl-c1">UnzipInflate</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">neededFiles</span> <span class="pl-c1">=</span> <span class="pl-kos">[</span><span class="pl-s">'file1.txt'</span><span class="pl-kos">,</span> <span class="pl-s">'example.json'</span><span class="pl-kos">]</span><span class="pl-kos">;</span> <span class="pl-c">// Can specify handler in constructor too</span> <span class="pl-s1">unzipper</span><span class="pl-kos">.</span><span class="pl-en">onfile</span> <span class="pl-c1">=</span> <span class="pl-s1">file</span> <span class="pl-c1">=></span> <span class="pl-kos">{</span> <span class="pl-c">// file.name is a string, file is a stream</span> <span class="pl-k">if</span> <span class="pl-kos">(</span><span class="pl-s1">neededFiles</span><span class="pl-kos">.</span><span class="pl-en">includes</span><span class="pl-kos">(</span><span class="pl-s1">file</span><span class="pl-kos">.</span><span class="pl-c1">name</span><span class="pl-kos">)</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-s1">file</span><span class="pl-kos">.</span><span class="pl-en">ondata</span> <span class="pl-c1">=</span> <span class="pl-kos">(</span><span class="pl-s1">err</span><span class="pl-kos">,</span> <span class="pl-s1">dat</span><span class="pl-kos">,</span> <span class="pl-s1">final</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-kos">{</span> <span class="pl-c">// Stream output here</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-s1">dat</span><span class="pl-kos">,</span> <span class="pl-s1">final</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span><span class="pl-kos">;</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-s">'Reading:'</span><span class="pl-kos">,</span> <span class="pl-s1">file</span><span class="pl-kos">.</span><span class="pl-c1">name</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// File sizes are sometimes not set if the ZIP file did not encode</span> <span class="pl-c">// them, so you may want to check that file.size != undefined</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-s">'Compressed size'</span><span class="pl-kos">,</span> <span class="pl-s1">file</span><span class="pl-kos">.</span><span class="pl-c1">size</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-s">'Decompressed size'</span><span class="pl-kos">,</span> <span class="pl-s1">file</span><span class="pl-kos">.</span><span class="pl-c1">originalSize</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// You should only start the stream if you plan to use it to improve</span> <span class="pl-c">// performance. Only after starting the stream will ondata be called.</span> <span class="pl-c">// This method will throw if the compression method hasn't been registered</span> <span class="pl-s1">file</span><span class="pl-kos">.</span><span class="pl-en">start</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-kos">}</span><span class="pl-kos">;</span> <span class="pl-c">// Try to keep under 5,000 files per chunk to avoid stack limit errors</span> <span class="pl-c">// For example, if all files are a few kB, multi-megabyte chunks are OK</span> <span class="pl-c">// If files are mostly under 100 bytes, 64kB chunks are the limit</span> <span class="pl-s1">unzipper</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-s1">zipChunk1</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">unzipper</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-s1">zipChunk2</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">unzipper</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-s1">zipChunk3</span><span class="pl-kos">,</span> <span class="pl-c1">true</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <p dir="auto">As you may have guessed, there is an asynchronous version of every method as well. Unlike most libraries, this will cause the compression or decompression run in a separate thread entirely and automatically by using Web (or Node) Workers. This means that the processing will not block the main thread at all.</p> <p dir="auto">Note that there is a significant initial overhead to using workers of about 50ms for each asynchronous function. For instance, if you call <code>unzip</code> ten times, the overhead only applies for the first call, but if you call <code>unzip</code> and <code>zlib</code>, they will each cause the 50ms delay. For small (under about 50kB) payloads, the asynchronous APIs will be much slower. However, if you're compressing larger files/multiple files at once, or if the synchronous API causes the main thread to hang for too long, the callback APIs are an order of magnitude better.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import { gzip, zlib, AsyncGzip, zip, unzip, strFromU8, Zip, AsyncZipDeflate, Unzip, AsyncUnzipInflate } from 'fflate'; // Workers will work in almost any browser (even IE11!) // All of the async APIs use a node-style callback as so: const terminate = gzip(aMassiveFile, (err, data) => { if (err) { // The compressed data was likely corrupt, so we have to handle // the error. return; } // Use data however you like console.log(data.length); }); if (needToCancel) { // The return value of any of the asynchronous APIs is a function that, // when called, will immediately cancel the operation. The callback // will not be called. terminate(); } // If you wish to provide options, use the second argument. // The consume option will render the data inside aMassiveFile unusable, // but can improve performance and dramatically reduce memory usage. zlib(aMassiveFile, { consume: true, level: 9 }, (err, data) => { // Use the data }); // Asynchronous streams are similar to synchronous streams, but the // handler has the error that occurred (if any) as the first parameter, // and they don't block the main thread. // Additionally, any buffers that are pushed in will be consumed and // rendered unusable; if you need to use a buffer you push in, you // should clone it first. const gzs = new AsyncGzip({ level: 9, mem: 12, filename: 'hello.txt' }); let wasCallbackCalled = false; gzs.ondata = (err, chunk, final) => { // Note the new err parameter if (err) { // Note that after this occurs, the stream becomes corrupt and must // be discarded. You can't continue pushing chunks and expect it to // work. console.error(err); return; } wasCallbackCalled = true; } gzs.push(chunk); // Since the stream is asynchronous, the callback will not be called // immediately. If such behavior is absolutely necessary (it shouldn't // be), use synchronous streams. console.log(wasCallbackCalled) // false // To terminate an asynchronous stream's internal worker, call // stream.terminate(). gzs.terminate(); // This is way faster than zipSync because the compression of multiple // files runs in parallel. In fact, the fact that it's parallelized // makes it faster than most standalone ZIP CLIs. The effect is most // significant for multiple large files; less so for many small ones. zip({ f1: aMassiveFile, 'f2.txt': anotherMassiveFile }, { // The options object is still optional, you can still do just // zip(archive, callback) level: 6 }, (err, data) => { // Save the ZIP file }); // unzip is the only async function without support for consume option // It is parallelized, so unzip is also often much faster than unzipSync unzip(aMassiveZIPFile, (err, unzipped) => { // If the archive has data.xml, log it here console.log(unzipped['data.xml']); // Conversion to string console.log(strFromU8(unzipped['data.xml'])) }); // Streaming ZIP archives can accept asynchronous streams. This automatically // uses multicore compression. const zip = new Zip(); zip.ondata = (err, chunk, final) => { ... }; // The JSON and BMP are compressed in parallel const exampleFile = new AsyncZipDeflate('example.json'); zip.add(exampleFile); exampleFile.push(JSON.stringify({ large: 'object' }), true); const exampleFile2 = new AsyncZipDeflate('example2.bmp', { level: 9 }); zip.add(exampleFile2); exampleFile2.push(ec2a); exampleFile2.push(ec2b); exampleFile2.push(ec2c); ... exampleFile2.push(ec2Final, true); zip.end(); // Streaming Unzip should register the asynchronous inflation algorithm // for parallel processing. const unzip = new Unzip(stream => { if (stream.name.endsWith('.json')) { stream.ondata = (err, chunk, final) => { ... }; stream.start(); if (needToCancel) { // To cancel these streams, call .terminate() stream.terminate(); } } }); unzip.register(AsyncUnzipInflate); unzip.push(data, true);"><pre><span class="pl-k">import</span> <span class="pl-kos">{</span> <span class="pl-s1">gzip</span><span class="pl-kos">,</span> <span class="pl-s1">zlib</span><span class="pl-kos">,</span> <span class="pl-v">AsyncGzip</span><span class="pl-kos">,</span> <span class="pl-s1">zip</span><span class="pl-kos">,</span> <span class="pl-s1">unzip</span><span class="pl-kos">,</span> <span class="pl-s1">strFromU8</span><span class="pl-kos">,</span> <span class="pl-v">Zip</span><span class="pl-kos">,</span> <span class="pl-v">AsyncZipDeflate</span><span class="pl-kos">,</span> <span class="pl-v">Unzip</span><span class="pl-kos">,</span> <span class="pl-v">AsyncUnzipInflate</span> <span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'fflate'</span><span class="pl-kos">;</span> <span class="pl-c">// Workers will work in almost any browser (even IE11!)</span> <span class="pl-c">// All of the async APIs use a node-style callback as so:</span> <span class="pl-k">const</span> <span class="pl-s1">terminate</span> <span class="pl-c1">=</span> <span class="pl-en">gzip</span><span class="pl-kos">(</span><span class="pl-s1">aMassiveFile</span><span class="pl-kos">,</span> <span class="pl-kos">(</span><span class="pl-s1">err</span><span class="pl-kos">,</span> <span class="pl-s1">data</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-kos">{</span> <span class="pl-k">if</span> <span class="pl-kos">(</span><span class="pl-s1">err</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-c">// The compressed data was likely corrupt, so we have to handle</span> <span class="pl-c">// the error.</span> <span class="pl-k">return</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-c">// Use data however you like</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-s1">data</span><span class="pl-kos">.</span><span class="pl-c1">length</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">if</span> <span class="pl-kos">(</span><span class="pl-s1">needToCancel</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-c">// The return value of any of the asynchronous APIs is a function that,</span> <span class="pl-c">// when called, will immediately cancel the operation. The callback</span> <span class="pl-c">// will not be called.</span> <span class="pl-s1">terminate</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-c">// If you wish to provide options, use the second argument.</span> <span class="pl-c">// The consume option will render the data inside aMassiveFile unusable,</span> <span class="pl-c">// but can improve performance and dramatically reduce memory usage.</span> <span class="pl-en">zlib</span><span class="pl-kos">(</span><span class="pl-s1">aMassiveFile</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">consume</span>: <span class="pl-c1">true</span><span class="pl-kos">,</span> <span class="pl-c1">level</span>: <span class="pl-c1">9</span> <span class="pl-kos">}</span><span class="pl-kos">,</span> <span class="pl-kos">(</span><span class="pl-s1">err</span><span class="pl-kos">,</span> <span class="pl-s1">data</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-kos">{</span> <span class="pl-c">// Use the data</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// Asynchronous streams are similar to synchronous streams, but the</span> <span class="pl-c">// handler has the error that occurred (if any) as the first parameter,</span> <span class="pl-c">// and they don't block the main thread.</span> <span class="pl-c">// Additionally, any buffers that are pushed in will be consumed and</span> <span class="pl-c">// rendered unusable; if you need to use a buffer you push in, you</span> <span class="pl-c">// should clone it first.</span> <span class="pl-k">const</span> <span class="pl-s1">gzs</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-v">AsyncGzip</span><span class="pl-kos">(</span><span class="pl-kos">{</span> <span class="pl-c1">level</span>: <span class="pl-c1">9</span><span class="pl-kos">,</span> <span class="pl-c1">mem</span>: <span class="pl-c1">12</span><span class="pl-kos">,</span> <span class="pl-c1">filename</span>: <span class="pl-s">'hello.txt'</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">let</span> <span class="pl-s1">wasCallbackCalled</span> <span class="pl-c1">=</span> <span class="pl-c1">false</span><span class="pl-kos">;</span> <span class="pl-s1">gzs</span><span class="pl-kos">.</span><span class="pl-en">ondata</span> <span class="pl-c1">=</span> <span class="pl-kos">(</span><span class="pl-s1">err</span><span class="pl-kos">,</span> <span class="pl-s1">chunk</span><span class="pl-kos">,</span> <span class="pl-s1">final</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-kos">{</span> <span class="pl-c">// Note the new err parameter</span> <span class="pl-k">if</span> <span class="pl-kos">(</span><span class="pl-s1">err</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-c">// Note that after this occurs, the stream becomes corrupt and must</span> <span class="pl-c">// be discarded. You can't continue pushing chunks and expect it to</span> <span class="pl-c">// work.</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">error</span><span class="pl-kos">(</span><span class="pl-s1">err</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">return</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-s1">wasCallbackCalled</span> <span class="pl-c1">=</span> <span class="pl-c1">true</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-s1">gzs</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-s1">chunk</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// Since the stream is asynchronous, the callback will not be called</span> <span class="pl-c">// immediately. If such behavior is absolutely necessary (it shouldn't</span> <span class="pl-c">// be), use synchronous streams.</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-s1">wasCallbackCalled</span><span class="pl-kos">)</span> <span class="pl-c">// false</span> <span class="pl-c">// To terminate an asynchronous stream's internal worker, call</span> <span class="pl-c">// stream.terminate().</span> <span class="pl-s1">gzs</span><span class="pl-kos">.</span><span class="pl-en">terminate</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// This is way faster than zipSync because the compression of multiple</span> <span class="pl-c">// files runs in parallel. In fact, the fact that it's parallelized</span> <span class="pl-c">// makes it faster than most standalone ZIP CLIs. The effect is most</span> <span class="pl-c">// significant for multiple large files; less so for many small ones.</span> <span class="pl-en">zip</span><span class="pl-kos">(</span><span class="pl-kos">{</span> <span class="pl-c1">f1</span>: <span class="pl-s1">aMassiveFile</span><span class="pl-kos">,</span> <span class="pl-s">'f2.txt'</span>: <span class="pl-s1">anotherMassiveFile</span> <span class="pl-kos">}</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c">// The options object is still optional, you can still do just</span> <span class="pl-c">// zip(archive, callback)</span> <span class="pl-c1">level</span>: <span class="pl-c1">6</span> <span class="pl-kos">}</span><span class="pl-kos">,</span> <span class="pl-kos">(</span><span class="pl-s1">err</span><span class="pl-kos">,</span> <span class="pl-s1">data</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-kos">{</span> <span class="pl-c">// Save the ZIP file</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// unzip is the only async function without support for consume option</span> <span class="pl-c">// It is parallelized, so unzip is also often much faster than unzipSync</span> <span class="pl-en">unzip</span><span class="pl-kos">(</span><span class="pl-s1">aMassiveZIPFile</span><span class="pl-kos">,</span> <span class="pl-kos">(</span><span class="pl-s1">err</span><span class="pl-kos">,</span> <span class="pl-s1">unzipped</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-kos">{</span> <span class="pl-c">// If the archive has data.xml, log it here</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-s1">unzipped</span><span class="pl-kos">[</span><span class="pl-s">'data.xml'</span><span class="pl-kos">]</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// Conversion to string</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-en">strFromU8</span><span class="pl-kos">(</span><span class="pl-s1">unzipped</span><span class="pl-kos">[</span><span class="pl-s">'data.xml'</span><span class="pl-kos">]</span><span class="pl-kos">)</span><span class="pl-kos">)</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// Streaming ZIP archives can accept asynchronous streams. This automatically</span> <span class="pl-c">// uses multicore compression.</span> <span class="pl-k">const</span> <span class="pl-s1">zip</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-v">Zip</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">zip</span><span class="pl-kos">.</span><span class="pl-en">ondata</span> <span class="pl-c1">=</span> <span class="pl-kos">(</span><span class="pl-s1">err</span><span class="pl-kos">,</span> <span class="pl-s1">chunk</span><span class="pl-kos">,</span> <span class="pl-s1">final</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-kos">{</span> ... <span class="pl-kos">}</span><span class="pl-kos">;</span> <span class="pl-c">// The JSON and BMP are compressed in parallel</span> <span class="pl-k">const</span> <span class="pl-s1">exampleFile</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-v">AsyncZipDeflate</span><span class="pl-kos">(</span><span class="pl-s">'example.json'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">zip</span><span class="pl-kos">.</span><span class="pl-en">add</span><span class="pl-kos">(</span><span class="pl-s1">exampleFile</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">exampleFile</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-c1">JSON</span><span class="pl-kos">.</span><span class="pl-en">stringify</span><span class="pl-kos">(</span><span class="pl-kos">{</span> <span class="pl-c1">large</span>: <span class="pl-s">'object'</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">,</span> <span class="pl-c1">true</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">exampleFile2</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-v">AsyncZipDeflate</span><span class="pl-kos">(</span><span class="pl-s">'example2.bmp'</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">level</span>: <span class="pl-c1">9</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">zip</span><span class="pl-kos">.</span><span class="pl-en">add</span><span class="pl-kos">(</span><span class="pl-s1">exampleFile2</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">exampleFile2</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-s1">ec2a</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">exampleFile2</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-s1">ec2b</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">exampleFile2</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-s1">ec2c</span><span class="pl-kos">)</span><span class="pl-kos">;</span> ... <span class="pl-s1">exampleFile2</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-s1">ec2Final</span><span class="pl-kos">,</span> <span class="pl-c1">true</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">zip</span><span class="pl-kos">.</span><span class="pl-en">end</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// Streaming Unzip should register the asynchronous inflation algorithm</span> <span class="pl-c">// for parallel processing.</span> <span class="pl-k">const</span> <span class="pl-s1">unzip</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-v">Unzip</span><span class="pl-kos">(</span><span class="pl-s1">stream</span> <span class="pl-c1">=></span> <span class="pl-kos">{</span> <span class="pl-k">if</span> <span class="pl-kos">(</span><span class="pl-s1">stream</span><span class="pl-kos">.</span><span class="pl-c1">name</span><span class="pl-kos">.</span><span class="pl-en">endsWith</span><span class="pl-kos">(</span><span class="pl-s">'.json'</span><span class="pl-kos">)</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-s1">stream</span><span class="pl-kos">.</span><span class="pl-en">ondata</span> <span class="pl-c1">=</span> <span class="pl-kos">(</span><span class="pl-s1">err</span><span class="pl-kos">,</span> <span class="pl-s1">chunk</span><span class="pl-kos">,</span> <span class="pl-s1">final</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-kos">{</span> ... <span class="pl-kos">}</span><span class="pl-kos">;</span> <span class="pl-s1">stream</span><span class="pl-kos">.</span><span class="pl-en">start</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">if</span> <span class="pl-kos">(</span><span class="pl-s1">needToCancel</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-c">// To cancel these streams, call .terminate()</span> <span class="pl-s1">stream</span><span class="pl-kos">.</span><span class="pl-en">terminate</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-kos">}</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">unzip</span><span class="pl-kos">.</span><span class="pl-en">register</span><span class="pl-kos">(</span><span class="pl-v">AsyncUnzipInflate</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">unzip</span><span class="pl-kos">.</span><span class="pl-en">push</span><span class="pl-kos">(</span><span class="pl-s1">data</span><span class="pl-kos">,</span> <span class="pl-c1">true</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <p dir="auto">See the <a href="https://github.com/101arrowz/fflate/blob/master/docs/README.md">documentation</a> for more detailed information about the API.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Bundle size estimates</h2><a id="user-content-bundle-size-estimates" class="anchor" aria-label="Permalink: Bundle size estimates" href="#bundle-size-estimates"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The bundle size measurements for <code>fflate</code> on sites like Bundlephobia include every feature of the library and should be seen as an upper bound. As long as you are using tree shaking or dead code elimination, this table should give you a general idea of <code>fflate</code>'s bundle size for the features you need.</p> <p dir="auto">The maximum bundle size that is possible with <code>fflate</code> is about 31kB (11.5kB gzipped) if you use every single feature, but feature parity with <code>pako</code> is only around 10kB (as opposed to 45kB from <code>pako</code>). If your bundle size increases dramatically after adding <code>fflate</code>, please <a href="https://github.com/101arrowz/fflate/issues/new">create an issue</a>.</p> <markdown-accessiblity-table><table> <thead> <tr> <th>Feature</th> <th>Bundle size (minified)</th> <th>Nearest competitor</th> </tr> </thead> <tbody> <tr> <td>Decompression</td> <td>3kB</td> <td><code>tiny-inflate</code></td> </tr> <tr> <td>Compression</td> <td>5kB</td> <td><code>UZIP.js</code>, 2.84x larger</td> </tr> <tr> <td>Async decompression</td> <td>4kB (1kB + raw decompression)</td> <td>N/A</td> </tr> <tr> <td>Async compression</td> <td>6kB (1kB + raw compression)</td> <td>N/A</td> </tr> <tr> <td>ZIP decompression</td> <td>5kB (2kB + raw decompression)</td> <td><code>UZIP.js</code>, 2.84x larger</td> </tr> <tr> <td>ZIP compression</td> <td>7kB (2kB + raw compression)</td> <td><code>UZIP.js</code>, 2.03x larger</td> </tr> <tr> <td>GZIP/Zlib decompression</td> <td>4kB (1kB + raw decompression)</td> <td><code>pako</code>, 11.4x larger</td> </tr> <tr> <td>GZIP/Zlib compression</td> <td>5kB (1kB + raw compression)</td> <td><code>pako</code>, 9.12x larger</td> </tr> <tr> <td>Streaming decompression</td> <td>4kB (1kB + raw decompression)</td> <td><code>pako</code>, 11.4x larger</td> </tr> <tr> <td>Streaming compression</td> <td>5kB (1kB + raw compression)</td> <td><code>pako</code>, 9.12x larger</td> </tr> </tbody> </table></markdown-accessiblity-table> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">What makes <code>fflate</code> so fast?</h2><a id="user-content-what-makes-fflate-so-fast" class="anchor" aria-label="Permalink: What makes fflate so fast?" href="#what-makes-fflate-so-fast"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Many JavaScript compression/decompression libraries exist. However, the most popular one, <a href="https://npmjs.com/package/pako" rel="nofollow"><code>pako</code></a>, is merely a clone of Zlib rewritten nearly line-for-line in JavaScript. Although it is by no means poorly made, <code>pako</code> doesn't recognize the many differences between JavaScript and C, and therefore is suboptimal for performance. Moreover, even when minified, the library is 45 kB; it may not seem like much, but for anyone concerned with optimizing bundle size (especially library authors), it's more weight than necessary.</p> <p dir="auto">Note that there exist some small libraries like <a href="https://npmjs.com/package/tiny-inflate" rel="nofollow"><code>tiny-inflate</code></a> for solely decompression, and with a minified size of 3 kB, it can be appealing; however, its performance is lackluster, typically 40% worse than <code>pako</code> in my tests.</p> <p dir="auto"><a href="https://github.com/photopea/UZIP.js"><code>UZIP.js</code></a> is both faster (by up to 40%) and smaller (14 kB minified) than <code>pako</code>, and it contains a variety of innovations that make it excellent for both performance and compression ratio. However, the developer made a variety of tiny mistakes and inefficient design choices that make it imperfect. Moreover, it does not support GZIP or Zlib data directly; one must remove the headers manually to use <code>UZIP.js</code>.</p> <p dir="auto">So what makes <code>fflate</code> different? It takes the brilliant innovations of <code>UZIP.js</code> and optimizes them while adding direct support for GZIP and Zlib data. And unlike all of the above libraries, it uses ES Modules to allow for partial builds through tree shaking, meaning that it can rival even <code>tiny-inflate</code> in size while maintaining excellent performance. The end result is a library that, in total, weighs 8kB minified for the core build (3kB for decompression only and 5kB for compression only), is about 15% faster than <code>UZIP.js</code> or up to 60% faster than <code>pako</code>, and achieves the same or better compression ratio than the rest.</p> <p dir="auto">Before you decide that <code>fflate</code> is the end-all compression library, you should note that JavaScript simply cannot rival the performance of a native program. If you're only using Node.js, it's probably better to use the <a href="https://nodejs.org/api/zlib.html" rel="nofollow">native Zlib bindings</a>, which tend to offer the best performance. Though note that even against Zlib, <code>fflate</code> is only around 30% slower in decompression and 10% slower in compression, and can still achieve better compression ratios!</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">What about <code>CompressionStream</code>?</h2><a id="user-content-what-about-compressionstream" class="anchor" aria-label="Permalink: What about CompressionStream?" href="#what-about-compressionstream"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Like <code>fflate</code>, the <a href="https://developer.mozilla.org/en-US/docs/Web/API/Compression_Streams_API" rel="nofollow">Compression Streams API</a> provides DEFLATE, GZIP, and Zlib compression and decompression support. It's a good option if you'd like to compress or decompress data without installing any third-party libraries, and it wraps native Zlib bindings to achieve better performance than what most JavaScript programs can achieve.</p> <p dir="auto">However, browsers do not offer any native non-streaming compression API, and <code>CompressionStream</code> has surprisingly poor performance on data already loaded into memory; <code>fflate</code> tends to be faster even for files that are dozens of megabytes large. Similarly, <code>fflate</code> is much faster for files under a megabyte because it avoids marshalling overheads. Even when streaming hundreds of megabytes of data, the native API usually performs between 30% faster and 10% slower than <code>fflate</code>. And Compression Streams have many other disadvantages - no ability to control compression level, poor support for older browsers, no ZIP support, etc.</p> <p dir="auto">If you'd still prefer to depend upon a native browser API but want to support older browsers, you can use an <code>fflate</code>-based <a href="https://github.com/101arrowz/compression-streams-polyfill">Compression Streams ponyfill</a>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Browser support</h2><a id="user-content-browser-support" class="anchor" aria-label="Permalink: Browser support" href="#browser-support"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><code>fflate</code> makes heavy use of typed arrays (<code>Uint8Array</code>, <code>Uint16Array</code>, etc.). Typed arrays can be polyfilled at the cost of performance, but the most recent browser that doesn't support them <a href="https://caniuse.com/typedarrays" rel="nofollow">is from 2011</a>, so I wouldn't bother.</p> <p dir="auto">The asynchronous APIs also use <code>Worker</code>, which is not supported in a few browsers (however, the vast majority of browsers that support typed arrays support <code>Worker</code>).</p> <p dir="auto">Other than that, <code>fflate</code> is completely ES3, meaning you probably won't even need a bundler to use it.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Testing</h2><a id="user-content-testing" class="anchor" aria-label="Permalink: Testing" href="#testing"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">You can validate the performance of <code>fflate</code> with <code>npm test</code>. It validates that the module is working as expected, ensures the outputs are no more than 5% larger than competitors at max compression, and outputs performance metrics to <code>test/results</code>.</p> <p dir="auto">Note that the time it takes for the CLI to show the completion of each test is not representative of the time each package took, so please check the JSON output if you want accurate measurements.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">License</h2><a id="user-content-license" class="anchor" aria-label="Permalink: License" href="#license"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This software is <a href="/101arrowz/fflate/blob/master/LICENSE">MIT Licensed</a>, with special exemptions for projects and organizations as noted below:</p> <ul dir="auto"> <li><a href="https://github.com/SheetJS/">SheetJS</a> is exempt from MIT licensing and may license any source code from this software under the BSD Zero Clause License</li> </ul> </article></div></div></div></div></div> <!-- --> <!-- --> <script type="application/json" id="__PRIMER_DATA_:R0:__">{"resolvedServerColorMode":"day"}</script></div> </react-partial> <input type="hidden" data-csrf="true" value="Xeb14SurF6F2O1KIh436qxc2xNwnzWzUJ4btWafyWFZXPZHNh/FLu6p0j+LaOkENbTKkWakIbpriHEIBl+OuGA==" /> </div> <div data-view-component="true" class="Layout-sidebar"> <div class="BorderGrid about-margin" data-pjax> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <div class="hide-sm hide-md"> <h2 class="mb-3 h4">About</h2> <p class="f4 my-3"> High performance (de)compression in an 8kB package </p> <div class="my-3 d-flex flex-items-center"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-link flex-shrink-0 mr-2"> <path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 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href="/contact/report-content?content_url=https%3A%2F%2Fgithub.com%2F101arrowz%2Ffflate&report=101arrowz+%28user%29"> Report repository </a> </div> </div> </div> </div> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <h2 class="h4 mb-3" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame"> <a href="/101arrowz/fflate/releases" data-view-component="true" class="Link--primary no-underline Link">Releases <span title="14" data-view-component="true" class="Counter">14</span></a></h2> <a class="Link--primary d-flex no-underline" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame" href="/101arrowz/fflate/releases/tag/v0.8.2"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-tag flex-shrink-0 mt-1 color-fg-success"> <path d="M1 7.775V2.75C1 1.784 1.784 1 2.75 1h5.025c.464 0 .91.184 1.238.513l6.25 6.25a1.75 1.75 0 0 1 0 2.474l-5.026 5.026a1.75 1.75 0 0 1-2.474 0l-6.25-6.25A1.752 1.752 0 0 1 1 7.775Zm1.5 0c0 .066.026.13.073.177l6.25 6.25a.25.25 0 0 0 .354 0l5.025-5.025a.25.25 0 0 0 0-.354l-6.25-6.25a.25.25 0 0 0-.177-.073H2.75a.25.25 0 0 0-.25.25ZM6 5a1 1 0 1 1 0 2 1 1 0 0 1 0-2Z"></path> </svg> <div class="ml-2 min-width-0"> <div class="d-flex"> <span class="css-truncate css-truncate-target text-bold mr-2" style="max-width: none;">v0.8.2</span> <span title="Label: Latest" data-view-component="true" class="Label Label--success flex-shrink-0"> Latest </span> </div> <div class="text-small color-fg-muted"><relative-time datetime="2024-02-07T00:41:24Z" class="no-wrap">Feb 7, 2024</relative-time></div> </div> </a> <div data-view-component="true" class="mt-3"> <a text="small" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame" href="/101arrowz/fflate/releases" data-view-component="true" class="Link">+ 13 releases</a></div> </div> </div> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <h2 class="h4 mb-3"> <a href="/users/101arrowz/packages?repo_name=fflate" data-view-component="true" class="Link--primary no-underline Link d-flex flex-items-center">Packages <span title="0" hidden="hidden" data-view-component="true" class="Counter ml-1">0</span></a></h2> <div class="text-small color-fg-muted" > No packages published <br> </div> </div> </div> <div class="BorderGrid-row" > <div class="BorderGrid-cell"> <h2 class="h4 mb-3"> <a href="/101arrowz/fflate/network/dependents" data-view-component="true" class="Link--primary no-underline Link">Used by <span title="463,234" data-view-component="true" class="Counter">463k</span></a> </h2> <a class="d-flex flex-items-center" href="/101arrowz/fflate/network/dependents"> <ul class="hx_flex-avatar-stack list-style-none min-width-0"> <li class="hx_flex-avatar-stack-item"> <img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/9606981?s=64&v=4" width="32" height="32" alt="@banned104" /> </li> <li class="hx_flex-avatar-stack-item"> <img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/122107384?s=64&v=4" width="32" height="32" alt="@SrihariKishoreK" /> </li> <li class="hx_flex-avatar-stack-item"> <img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/97840850?s=64&v=4" width="32" height="32" alt="@suhashines" /> </li> <li class="hx_flex-avatar-stack-item"> <img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/54747391?s=64&v=4" width="32" height="32" alt="@usrbinkat" /> </li> <li class="hx_flex-avatar-stack-item"> <img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/156046839?s=64&v=4" width="32" height="32" alt="@Kguswo" /> </li> <li class="hx_flex-avatar-stack-item"> <img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/91377781?s=64&v=4" width="32" height="32" alt="@Tarun516" /> </li> <li class="hx_flex-avatar-stack-item"> <img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/30657622?s=64&v=4" width="32" height="32" alt="@tiresomefanatic" /> </li> <li class="hx_flex-avatar-stack-item"> <img class="avatar" src="https://avatars.githubusercontent.com/u/66028997?s=64&v=4" width="32" height="32" alt="@Commencement-Technology" /> </li> </ul> <span class="px-2 text-bold text-small no-wrap"> + 463,226 </span> </a> </div> </div> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <h2 class="h4 mb-3"> <a href="/101arrowz/fflate/graphs/contributors" data-view-component="true" class="Link--primary no-underline Link d-flex flex-items-center">Contributors <span title="8" data-view-component="true" class="Counter ml-1">8</span></a></h2> <include-fragment src="/101arrowz/fflate/contributors_list?count=8&current_repository=fflate&items_to_show=8" aria-busy="true" aria-label="Loading contributors"> <ul class="list-style-none d-flex flex-wrap mb-n2"> <li class="mb-2 "> <div class="Skeleton avatar avatar-user 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