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GitHub - tc39/proposal-import-attributes: Proposal for syntax to import ES modules with assertions

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js-prevent-focus-on-mobile-nav" href="/" aria-label="Homepage" data-analytics-event="{&quot;category&quot;:&quot;Marketing nav&quot;,&quot;action&quot;:&quot;click to go to homepage&quot;,&quot;label&quot;:&quot;ref_page:Marketing;ref_cta:Logomark;ref_loc:Header&quot;}"> <svg height="32" aria-hidden="true" viewBox="0 0 24 24" version="1.1" width="32" data-view-component="true" class="octicon octicon-mark-github"> <path d="M12.5.75C6.146.75 1 5.896 1 12.25c0 5.089 3.292 9.387 7.863 10.91.575.101.79-.244.79-.546 0-.273-.014-1.178-.014-2.142-2.889.532-3.636-.704-3.866-1.35-.13-.331-.69-1.352-1.18-1.625-.402-.216-.977-.748-.014-.762.906-.014 1.553.834 1.769 1.179 1.035 1.74 2.688 1.25 3.349.948.1-.747.402-1.25.733-1.538-2.559-.287-5.232-1.279-5.232-5.678 0-1.25.445-2.285 1.178-3.09-.115-.288-.517-1.467.115-3.048 0 0 .963-.302 3.163 1.179.92-.259 1.897-.388 2.875-.388.977 0 1.955.13 2.875.388 2.2-1.495 3.162-1.179 3.162-1.179.633 1.581.23 2.76.115 3.048.733.805 1.179 1.825 1.179 3.09 0 4.413-2.688 5.39-5.247 5.678.417.36.776 1.05.776 2.128 0 1.538-.014 2.774-.014 3.162 0 .302.216.662.79.547C20.709 21.637 24 17.324 24 12.25 24 5.896 18.854.75 12.5.75Z"></path> </svg> </a> <div class="flex-1 flex-order-2 text-right"> <a href="/login?return_to=https%3A%2F%2Fgithub.com%2Ftc39%2Fproposal-import-attributes" class="HeaderMenu-link HeaderMenu-button d-inline-flex d-lg-none flex-order-1 f5 no-underline border color-border-default rounded-2 px-2 py-1 color-fg-inherit js-prevent-focus-on-mobile-nav" data-hydro-click="{&quot;event_type&quot;:&quot;authentication.click&quot;,&quot;payload&quot;:{&quot;location_in_page&quot;:&quot;site header menu&quot;,&quot;repository_id&quot;:null,&quot;auth_type&quot;:&quot;SIGN_UP&quot;,&quot;originating_url&quot;:&quot;https://github.com/tc39/proposal-import-attributes&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="f9853338ae665fece2e9e3448fc338a009938c58a6109108e6219669bb16094f" data-analytics-event="{&quot;category&quot;:&quot;Marketing nav&quot;,&quot;action&quot;:&quot;click to Sign in&quot;,&quot;label&quot;:&quot;ref_page:Marketing;ref_cta:Sign in;ref_loc:Header&quot;}" > Sign in </a> </div> </div> <div class="HeaderMenu js-header-menu height-fit position-lg-relative d-lg-flex flex-column flex-auto top-0"> <div class="HeaderMenu-wrapper d-flex flex-column flex-self-start flex-lg-row flex-auto rounded rounded-lg-0"> <nav class="HeaderMenu-nav" aria-label="Global"> <ul class="d-lg-flex list-style-none"> <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Product <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 d-lg-flex flex-wrap dropdown-menu-wide"> <div class="HeaderMenu-column px-lg-4 border-lg-right mb-4 mb-lg-0 pr-lg-7"> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0"> <ul class="list-style-none f5" > <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="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;github_copilot&quot;,&quot;context&quot;:&quot;product&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;github_copilot_link_product_navbar&quot;}" href="https://github.com/features/copilot"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-copilot color-fg-subtle mr-3"> <path d="M23.922 16.992c-.861 1.495-5.859 5.023-11.922 5.023-6.063 0-11.061-3.528-11.922-5.023A.641.641 0 0 1 0 16.736v-2.869a.841.841 0 0 1 .053-.22c.372-.935 1.347-2.292 2.605-2.656.167-.429.414-1.055.644-1.517a10.195 10.195 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 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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="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;security&quot;,&quot;context&quot;:&quot;product&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;security_link_product_navbar&quot;}" href="https://github.com/features/security"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-shield-check color-fg-subtle mr-3"> <path d="M16.53 9.78a.75.75 0 0 0-1.06-1.06L11 13.19l-1.97-1.97a.75.75 0 0 0-1.06 1.06l2.5 2.5a.75.75 0 0 0 1.06 0l5-5Z"></path><path d="m12.54.637 8.25 2.675A1.75 1.75 0 0 1 22 4.976V10c0 6.19-3.771 10.704-9.401 12.83a1.704 1.704 0 0 1-1.198 0C5.77 20.705 2 16.19 2 10V4.976c0-.758.489-1.43 1.21-1.664L11.46.637a1.748 1.748 0 0 1 1.08 0Zm-.617 1.426-8.25 2.676a.249.249 0 0 0-.173.237V10c0 5.46 3.28 9.483 8.43 11.426a.199.199 0 0 0 .14 0C17.22 19.483 20.5 15.461 20.5 10V4.976a.25.25 0 0 0-.173-.237l-8.25-2.676a.253.253 0 0 0-.154 0Z"></path> </svg> <div> <div class="color-fg-default h4">Security</div> Find and fix vulnerabilities </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="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;actions&quot;,&quot;context&quot;:&quot;product&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;actions_link_product_navbar&quot;}" href="https://github.com/features/actions"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-workflow color-fg-subtle mr-3"> <path d="M1 3a2 2 0 0 1 2-2h6.5a2 2 0 0 1 2 2v6.5a2 2 0 0 1-2 2H7v4.063C7 16.355 7.644 17 8.438 17H12.5v-2.5a2 2 0 0 1 2-2H21a2 2 0 0 1 2 2V21a2 2 0 0 1-2 2h-6.5a2 2 0 0 1-2-2v-2.5H8.437A2.939 2.939 0 0 1 5.5 15.562V11.5H3a2 2 0 0 1-2-2Zm2-.5a.5.5 0 0 0-.5.5v6.5a.5.5 0 0 0 .5.5h6.5a.5.5 0 0 0 .5-.5V3a.5.5 0 0 0-.5-.5ZM14.5 14a.5.5 0 0 0-.5.5V21a.5.5 0 0 0 .5.5H21a.5.5 0 0 0 .5-.5v-6.5a.5.5 0 0 0-.5-.5Z"></path> </svg> <div> <div class="color-fg-default h4">Actions</div> Automate any workflow </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="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;codespaces&quot;,&quot;context&quot;:&quot;product&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;codespaces_link_product_navbar&quot;}" href="https://github.com/features/codespaces"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-codespaces color-fg-subtle mr-3"> <path d="M3.5 3.75C3.5 2.784 4.284 2 5.25 2h13.5c.966 0 1.75.784 1.75 1.75v7.5A1.75 1.75 0 0 1 18.75 13H5.25a1.75 1.75 0 0 1-1.75-1.75Zm-2 12c0-.966.784-1.75 1.75-1.75h17.5c.966 0 1.75.784 1.75 1.75v4a1.75 1.75 0 0 1-1.75 1.75H3.25a1.75 1.75 0 0 1-1.75-1.75ZM5.25 3.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h13.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Zm-2 12a.25.25 0 0 0-.25.25v4c0 .138.112.25.25.25h17.5a.25.25 0 0 0 .25-.25v-4a.25.25 0 0 0-.25-.25Z"></path><path d="M10 17.75a.75.75 0 0 1 .75-.75h6.5a.75.75 0 0 1 0 1.5h-6.5a.75.75 0 0 1-.75-.75Zm-4 0a.75.75 0 0 1 .75-.75h.5a.75.75 0 0 1 0 1.5h-.5a.75.75 0 0 1-.75-.75Z"></path> </svg> <div> <div class="color-fg-default h4">Codespaces</div> Instant dev environments </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="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;issues&quot;,&quot;context&quot;:&quot;product&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;issues_link_product_navbar&quot;}" href="https://github.com/features/issues"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-issue-opened color-fg-subtle mr-3"> <path d="M12 1c6.075 0 11 4.925 11 11s-4.925 11-11 11S1 18.075 1 12 5.925 1 12 1ZM2.5 12a9.5 9.5 0 0 0 9.5 9.5 9.5 9.5 0 0 0 9.5-9.5A9.5 9.5 0 0 0 12 2.5 9.5 9.5 0 0 0 2.5 12Zm9.5 2a2 2 0 1 1-.001-3.999A2 2 0 0 1 12 14Z"></path> </svg> <div> <div class="color-fg-default h4">Issues</div> Plan and track work </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="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;code_review&quot;,&quot;context&quot;:&quot;product&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;code_review_link_product_navbar&quot;}" href="https://github.com/features/code-review"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-code-review color-fg-subtle mr-3"> <path d="M10.3 6.74a.75.75 0 0 1-.04 1.06l-2.908 2.7 2.908 2.7a.75.75 0 1 1-1.02 1.1l-3.5-3.25a.75.75 0 0 1 0-1.1l3.5-3.25a.75.75 0 0 1 1.06.04Zm3.44 1.06a.75.75 0 1 1 1.02-1.1l3.5 3.25a.75.75 0 0 1 0 1.1l-3.5 3.25a.75.75 0 1 1-1.02-1.1l2.908-2.7-2.908-2.7Z"></path><path d="M1.5 4.25c0-.966.784-1.75 1.75-1.75h17.5c.966 0 1.75.784 1.75 1.75v12.5a1.75 1.75 0 0 1-1.75 1.75h-9.69l-3.573 3.573A1.458 1.458 0 0 1 5 21.043V18.5H3.25a1.75 1.75 0 0 1-1.75-1.75ZM3.25 4a.25.25 0 0 0-.25.25v12.5c0 .138.112.25.25.25h2.5a.75.75 0 0 1 .75.75v3.19l3.72-3.72a.749.749 0 0 1 .53-.22h10a.25.25 0 0 0 .25-.25V4.25a.25.25 0 0 0-.25-.25Z"></path> </svg> <div> <div class="color-fg-default h4">Code Review</div> Manage code changes </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="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;discussions&quot;,&quot;context&quot;:&quot;product&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;discussions_link_product_navbar&quot;}" href="https://github.com/features/discussions"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-comment-discussion color-fg-subtle mr-3"> <path d="M1.75 1h12.5c.966 0 1.75.784 1.75 1.75v9.5A1.75 1.75 0 0 1 14.25 14H8.061l-2.574 2.573A1.458 1.458 0 0 1 3 15.543V14H1.75A1.75 1.75 0 0 1 0 12.25v-9.5C0 1.784.784 1 1.75 1ZM1.5 2.75v9.5c0 .138.112.25.25.25h2a.75.75 0 0 1 .75.75v2.19l2.72-2.72a.749.749 0 0 1 .53-.22h6.5a.25.25 0 0 0 .25-.25v-9.5a.25.25 0 0 0-.25-.25H1.75a.25.25 0 0 0-.25.25Z"></path><path d="M22.5 8.75a.25.25 0 0 0-.25-.25h-3.5a.75.75 0 0 1 0-1.5h3.5c.966 0 1.75.784 1.75 1.75v9.5A1.75 1.75 0 0 1 22.25 20H21v1.543a1.457 1.457 0 0 1-2.487 1.03L15.939 20H10.75A1.75 1.75 0 0 1 9 18.25v-1.465a.75.75 0 0 1 1.5 0v1.465c0 .138.112.25.25.25h5.5a.75.75 0 0 1 .53.22l2.72 2.72v-2.19a.75.75 0 0 1 .75-.75h2a.25.25 0 0 0 .25-.25v-9.5Z"></path> </svg> <div> <div class="color-fg-default h4">Discussions</div> Collaborate outside of code </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" 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</li> <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Solutions <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 d-lg-flex flex-wrap dropdown-menu-wide"> <div class="HeaderMenu-column px-lg-4 border-lg-right mb-4 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data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;manufacturing&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;manufacturing_link_solutions_navbar&quot;}" href="/solutions/industry/manufacturing"> Manufacturing </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;government&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;government_link_solutions_navbar&quot;}" href="/solutions/industry/government"> Government </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" 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flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Resources <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 d-lg-flex flex-wrap dropdown-menu-wide"> <div class="HeaderMenu-column px-lg-4 border-lg-right mb-4 mb-lg-0 pr-lg-7"> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0"> <span class="d-block h4 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data-target="react-partial.embeddedData">{"props":{"initialPayload":{"allShortcutsEnabled":false,"path":"/","repo":{"id":215342689,"defaultBranch":"master","name":"proposal-import-attributes","ownerLogin":"tc39","currentUserCanPush":false,"isFork":false,"isEmpty":false,"createdAt":"2019-10-15T16:13:10.000Z","ownerAvatar":"https://avatars.githubusercontent.com/u/1725583?v=4","public":true,"private":false,"isOrgOwned":true},"currentUser":null,"refInfo":{"name":"master","listCacheKey":"v0:1722326696.0","canEdit":false,"refType":"branch","currentOid":"c6288af3977cb8f78a1781cab18d6d57354ea494"},"tree":{"items":[{"name":".github/workflows","path":".github/workflows","contentType":"directory","hasSimplifiedPath":true},{"name":".editorconfig","path":".editorconfig","contentType":"file"},{"name":".gitattributes","path":".gitattributes","contentType":"file"},{"name":".gitignore","path":".gitignore","contentType":"file"},{"name":".npmrc","path":".npmrc","contentType":"file"},{"name":".nvmrc","path":".nvmrc","contentType":"file"},{"name":"LICENSE","path":"LICENSE","contentType":"file"},{"name":"README.md","path":"README.md","contentType":"file"},{"name":"content-type-vs-file-extension.md","path":"content-type-vs-file-extension.md","contentType":"file"},{"name":"index.html","path":"index.html","contentType":"file"},{"name":"package.json","path":"package.json","contentType":"file"},{"name":"spec.emu","path":"spec.emu","contentType":"file"},{"name":"tag-security-and-privacy.md","path":"tag-security-and-privacy.md","contentType":"file"}],"templateDirectorySuggestionUrl":null,"readme":null,"totalCount":13,"showBranchInfobar":false},"fileTree":null,"fileTreeProcessingTime":null,"foldersToFetch":[],"treeExpanded":false,"symbolsExpanded":false,"isOverview":true,"overview":{"banners":{"shouldRecommendReadme":false,"isPersonalRepo":false,"showUseActionBanner":false,"actionSlug":null,"actionId":null,"showProtectBranchBanner":false,"publishBannersInfo":{"dismissActionNoticePath":"/settings/dismiss-notice/publish_action_from_repo","releasePath":"/tc39/proposal-import-attributes/releases/new?marketplace=true","showPublishActionBanner":false},"interactionLimitBanner":null,"showInvitationBanner":false,"inviterName":null,"actionsMigrationBannerInfo":{"releaseTags":[],"showImmutableActionsMigrationBanner":false,"initialMigrationStatus":null}},"codeButton":{"contactPath":"/contact","isEnterprise":false,"local":{"protocolInfo":{"httpAvailable":true,"sshAvailable":null,"httpUrl":"https://github.com/tc39/proposal-import-attributes.git","showCloneWarning":null,"sshUrl":null,"sshCertificatesRequired":null,"sshCertificatesAvailable":null,"ghCliUrl":"gh repo clone tc39/proposal-import-attributes","defaultProtocol":"http","newSshKeyUrl":"/settings/ssh/new","setProtocolPath":"/users/set_protocol"},"platformInfo":{"cloneUrl":"https://desktop.github.com","showVisualStudioCloneButton":false,"visualStudioCloneUrl":"https://windows.github.com","showXcodeCloneButton":false,"xcodeCloneUrl":"xcode://clone?repo=https%3A%2F%2Fgithub.com%2Ftc39%2Fproposal-import-attributes","zipballUrl":"/tc39/proposal-import-attributes/archive/refs/heads/master.zip"}},"newCodespacePath":"/codespaces/new?hide_repo_select=true\u0026repo=215342689"},"popovers":{"rename":null,"renamedParentRepo":null},"commitCount":"138","overviewFiles":[{"displayName":"README.md","repoName":"proposal-import-attributes","refName":"master","path":"README.md","preferredFileType":"readme","tabName":"README","richText":"\u003carticle class=\"markdown-body entry-content container-lg\" itemprop=\"text\"\u003e\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eImport Attributes\u003c/h1\u003e\u003ca id=\"user-content-import-attributes\" class=\"anchor\" aria-label=\"Permalink: Import Attributes\" href=\"#import-attributes\"\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\"\u003eChampions: Sven Sauleau (\u003ca href=\"https://github.com/xtuc\"\u003e@xtuc\u003c/a\u003e), Daniel Ehrenberg (\u003ca href=\"https://github.com/littledan\"\u003e@littledan\u003c/a\u003e), Myles Borins (\u003ca href=\"https://github.com/MylesBorins\"\u003e@MylesBorins\u003c/a\u003e), Dan Clark (\u003ca href=\"https://github.com/dandclark\"\u003e@dandclark\u003c/a\u003e), and Nicolò Ribaudo (\u003ca href=\"https://github.com/nicolo-ribaudo\"\u003e@nicolo-ribaudo\u003c/a\u003e).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eStatus: Stage 3\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003e\u003cg-emoji class=\"g-emoji\" alias=\"warning\"\u003e⚠️\u003c/g-emoji\u003e The specification in this proposal might be out of date. \u003ca href=\"https://github.com/tc39/ecma262/pull/3057\" data-hovercard-type=\"pull_request\" data-hovercard-url=\"/tc39/ecma262/pull/3057/hovercard\"\u003etc39/ecma262#3057\u003c/a\u003e is the latest version.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSome of the changes present in the current specification have not been presented to committee yet: \u003ca href=\"https://github.com/tc39/proposal-import-attributes/issues/142\" data-hovercard-type=\"issue\" data-hovercard-url=\"/tc39/proposal-import-attributes/issues/142/hovercard\"\u003e#142\u003c/a\u003e\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003ePlease leave any feedback you have in the \u003ca href=\"http://github.com/tc39/proposal-import-attributes/issues\"\u003eissues\u003c/a\u003e!\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSynopsis\u003c/h2\u003e\u003ca id=\"user-content-synopsis\" class=\"anchor\" aria-label=\"Permalink: Synopsis\" href=\"#synopsis\"\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 Import Attributes proposal, formerly known as Import Assertions, adds an inline syntax for module import statements to pass on more information alongside the module specifier. The initial application for such attributes will be to support additional types of modules in a common way across JavaScript environments, starting with \u003ca href=\"http://github.com/tc39/proposal-json-modules\"\u003eJSON modules\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe syntax will be as follows (shown here is the proposed method for importing a JSON module):\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import json from \u0026quot;./foo.json\u0026quot; with { type: \u0026quot;json\u0026quot; };\nimport(\u0026quot;foo.json\u0026quot;, { with: { type: \u0026quot;json\u0026quot; } });\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ejson\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"./foo.json\"\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ewith\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003etype\u003c/span\u003e: \"\u003cspan class=\"pl-s1\"\u003ejson\u003c/span\u003e\" \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"foo.json\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ewith\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etype\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\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe specification of JSON modules was originally part of this proposal, but it was \u003ca href=\"https://github.com/tc39/notes/blob/master/meetings/2020-07/july-21.md#import-conditions-for-stage-3\"\u003eresolved\u003c/a\u003e during the July 2020 meeting to split JSON modules out into a \u003ca href=\"http://github.com/tc39/proposal-json-modules\"\u003eseparate Stage 3 proposal\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMotivation\u003c/h2\u003e\u003ca id=\"user-content-motivation\" class=\"anchor\" aria-label=\"Permalink: Motivation\" href=\"#motivation\"\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\"\u003eStandards-track JSON ES modules were \u003ca href=\"https://github.com/w3c/webcomponents/issues/770\" data-hovercard-type=\"issue\" data-hovercard-url=\"/WICG/webcomponents/issues/770/hovercard\"\u003eproposed\u003c/a\u003e to allow JavaScript modules to easily import JSON data files, similarly to how they are supported in many nonstandard JavaScript module systems. This idea quickly got broad support from web developers and browsers, and was merged into HTML, with an implementation for V8/Chromium created by Microsoft.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eHowever, in \u003ca href=\"https://github.com/w3c/webcomponents/issues/839\" data-hovercard-type=\"issue\" data-hovercard-url=\"/WICG/webcomponents/issues/839/hovercard\"\u003ean issue\u003c/a\u003e, Ryosuke Niwa (Apple) and Anne van Kesteren (Mozilla) proposed that security would be improved if some syntactic marker were required when importing JSON modules and similar module types which cannot execute code, to prevent a scenario where the responding server unexpectedly provides a different MIME type, causing code to be unexpectedly executed. The solution was to somehow indicate that a module was JSON, or in general, not to be executed, somewhere in addition to the MIME type.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSome developers have the intuition that the file extension could be used to determine the module type, as it is in many existing non-standard module systems. However, it's a deep web architectural principle that the suffix of the URL (which you might think of as the \"file extension\" outside of the web) does not lead to semantics of how the page is interpreted. In practice, on the web, there is a widespread \u003ca href=\"/tc39/proposal-import-attributes/blob/master/content-type-vs-file-extension.md\"\u003emismatch between file extension and the HTTP Content Type header\u003c/a\u003e. All of this sums up to it being infeasible to depend on file extensions/suffixes included in the module specifier to be the basis for this checking.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThere are other possible pieces of metadata which could be associated with modules, see \u003ca href=\"https://github.com/tc39/proposal-import-attributes/issues/8\" data-hovercard-type=\"issue\" data-hovercard-url=\"/tc39/proposal-import-attributes/issues/8/hovercard\"\u003e#8\u003c/a\u003e and \u003ca href=\"https://github.com/tc39/proposal-import-reflection/issues/18\" data-hovercard-type=\"issue\" data-hovercard-url=\"/tc39/proposal-source-phase-imports/issues/18/hovercard\"\u003etc39/proposal-import-reflection#18\u003c/a\u003e for further discussion.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eProposed ES module types that are blocked by this security concern, in addition to JSON modules, include \u003ca href=\"https://github.com/whatwg/html/pull/4898\" data-hovercard-type=\"pull_request\" data-hovercard-url=\"/whatwg/html/pull/4898/hovercard\"\u003eCSS modules\u003c/a\u003e and potentially \u003ca href=\"https://github.com/whatwg/html/pull/4505\" data-hovercard-type=\"pull_request\" data-hovercard-url=\"/whatwg/html/pull/4505/hovercard\"\u003eHTML modules\u003c/a\u003e if the HTML module proposal is restricted to \u003ca href=\"https://github.com/w3c/webcomponents/issues/805\" data-hovercard-type=\"issue\" data-hovercard-url=\"/WICG/webcomponents/issues/805/hovercard\"\u003enot allow script\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRationale\u003c/h2\u003e\u003ca id=\"user-content-rationale\" class=\"anchor\" aria-label=\"Permalink: Rationale\" href=\"#rationale\"\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\"\u003eThere are three places where this data could be provided:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eAs part of the module specifier (e.g., as a pseudo-scheme)\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eChallenges: Adds complexity to URLs or other module specifier syntaxes, and risks being confusing to developers (further discussion: \u003ca href=\"https://github.com/tc39/proposal-import-attributes/issues/11\" data-hovercard-type=\"issue\" data-hovercard-url=\"/tc39/proposal-import-attributes/issues/11/hovercard\"\u003e#11\u003c/a\u003e)\u003c/li\u003e\n\u003cli\u003ewebpack supports this sort of construct (\u003ca href=\"https://webpack.js.org/concepts/loaders/#inline\" rel=\"nofollow\"\u003edocs\u003c/a\u003e).\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eDemand from users for similar behavior in Parcel, with pushback from some maintainers (\u003ca href=\"https://github.com/parcel-bundler/parcel/issues/3477\" data-hovercard-type=\"issue\" data-hovercard-url=\"/parcel-bundler/parcel/issues/3477/hovercard\"\u003e#3477\u003c/a\u003e)\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eSeparately, out of band (e.g., a separate resource file)\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eChallenges: How to load that resource file; what should the format be; unergonomic to have to jump between files during development (further discussion: \u003ca href=\"https://github.com/tc39/proposal-import-attributes/issues/13\" data-hovercard-type=\"issue\" data-hovercard-url=\"/tc39/proposal-import-attributes/issues/13/hovercard\"\u003e#13\u003c/a\u003e)\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eIn the JavaScript source text\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eChallenges: Requires a change at the JavaScript language level (this proposal)\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eThis proposal pursues the third option, as we expect it to lead to the best developer experience, and are hopeful that language design/standardization issues can be resolved.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eProposed syntax\u003c/h2\u003e\u003ca id=\"user-content-proposed-syntax\" class=\"anchor\" aria-label=\"Permalink: Proposed syntax\" href=\"#proposed-syntax\"\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\"\u003eImport attributes have to be made available in several different contexts. They use a key-value syntax is used preceded by the \u003ccode\u003ewith\u003c/code\u003e keyword, with the key \u003ccode\u003etype\u003c/code\u003e used as an example indicating the module type. Such key-value syntax can be used in various different contexts.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eimport statements\u003c/h3\u003e\u003ca id=\"user-content-import-statements\" class=\"anchor\" aria-label=\"Permalink: import statements\" href=\"#import-statements\"\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 ImportDeclaration would allow any arbitrary attributes after the \u003ccode\u003ewith\u003c/code\u003e keyword.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFor example, the \u003ccode\u003etype\u003c/code\u003e attribute could be used to indicate a module type, for example importing a JSON module with the following syntax.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import json from \u0026quot;./foo.json\u0026quot; with { type: \u0026quot;json\u0026quot; };\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ejson\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"./foo.json\"\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ewith\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003etype\u003c/span\u003e: \"\u003cspan class=\"pl-s1\"\u003ejson\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\"\u003eThe \u003ccode\u003ewith\u003c/code\u003e syntax in the \u003ccode\u003eImportDeclaration\u003c/code\u003e statement uses curly braces, for the following reasons (as discussed in \u003ca href=\"https://github.com/tc39/proposal-import-attributes/issues/5\" data-hovercard-type=\"issue\" data-hovercard-url=\"/tc39/proposal-import-attributes/issues/5/hovercard\"\u003e#5\u003c/a\u003e):\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eJavaScript developers are already used to the Object literal syntax and since it allows a trailing comma copy/pasting attributes will be easy.\u003c/li\u003e\n\u003cli\u003eit clearly indicates the end of the attributes list when splitting them across multiple lines.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ere-export statements\u003c/h3\u003e\u003ca id=\"user-content-re-export-statements\" class=\"anchor\" aria-label=\"Permalink: re-export statements\" href=\"#re-export-statements\"\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\"\u003eSimilar to import statements, the ExportDeclaration, when re-exporting from another module, would allow any arbitrary attributes after the \u003ccode\u003ewith\u003c/code\u003e keyword.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"export { val } from './foo.js' with { type: \u0026quot;javascript\u0026quot; };\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eexport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eval\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'./foo.js'\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ewith\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e type: \u003cspan class=\"pl-s\"\u003e\"javascript\"\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\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003edynamic import()\u003c/h3\u003e\u003ca id=\"user-content-dynamic-import\" class=\"anchor\" aria-label=\"Permalink: dynamic import()\" href=\"#dynamic-import\"\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 \u003ccode\u003eimport()\u003c/code\u003e pseudo-function would allow import attributes to be indicated in an options bag in the second argument.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import(\u0026quot;foo.json\u0026quot;, { with: { type: \u0026quot;json\u0026quot; } })\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"foo.json\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ewith\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etype\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\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe second parameter to \u003ccode\u003eimport()\u003c/code\u003e is an options bag, with the only option currently defined to be \u003ccode\u003ewith\u003c/code\u003e: the value here is an object containing the import attributes. There are other proposals for entries to put in the options bag: for example, the \u003ca href=\"https://github.com/tc39/proposal-import-reflection\"\u003eModule Source Imports\u003c/a\u003e proposal introduces a \u003ccode\u003ephase\u003c/code\u003e property.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eIntegration of modules into environments\u003c/h3\u003e\u003ca id=\"user-content-integration-of-modules-into-environments\" class=\"anchor\" aria-label=\"Permalink: Integration of modules into environments\" href=\"#integration-of-modules-into-environments\"\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\"\u003eHost environments (e.g., the Web platform, Node.js) often provide various different ways of loading modules. The analogous string could be passed through these ways of loading other kinds of modules.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWorker instantiation\u003c/h4\u003e\u003ca id=\"user-content-worker-instantiation\" class=\"anchor\" aria-label=\"Permalink: Worker instantiation\" href=\"#worker-instantiation\"\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\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"new Worker(\u0026quot;foo.wasm\u0026quot;, { type: \u0026quot;module\u0026quot;, with: { type: \u0026quot;webassembly\u0026quot; } });\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eWorker\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"foo.wasm\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etype\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"module\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ewith\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etype\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"webassembly\"\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-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSidebar about WebAssembly module types and the web: it's still uncertain whether importing WebAssembly modules would need to be marked specially, or would be imported just like JavaScript. Further discussion in \u003ca href=\"https://github.com/tc39/proposal-import-attributes/issues/19\" data-hovercard-type=\"issue\" data-hovercard-url=\"/tc39/proposal-import-attributes/issues/19/hovercard\"\u003e#19\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eHTML\u003c/h4\u003e\u003ca id=\"user-content-html\" class=\"anchor\" aria-label=\"Permalink: HTML\" href=\"#html\"\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\"\u003eAlthough changes to HTML won't be specified by TC39, an idea here would be that each import attribute, preceded by \u003ccode\u003ewith\u003c/code\u003e, becomes an HTML attribute which could be used in script tags.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-basic notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"\u0026lt;script src=\u0026quot;foo.wasm\u0026quot; type=\u0026quot;module\u0026quot; withtype=\u0026quot;webassembly\u0026quot;\u0026gt;\u0026lt;/script\u0026gt;\"\u003e\u003cpre\u003e\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\"\u003efoo.wasm\u003c/span\u003e\" \u003cspan class=\"pl-c1\"\u003etype\u003c/span\u003e=\"\u003cspan class=\"pl-s\"\u003emodule\u003c/span\u003e\" \u003cspan class=\"pl-c1\"\u003ewithtype\u003c/span\u003e=\"\u003cspan class=\"pl-s\"\u003ewebassembly\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\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e(See the caveat about WebAssembly above.)\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWebAssembly\u003c/h4\u003e\u003ca id=\"user-content-webassembly\" class=\"anchor\" aria-label=\"Permalink: WebAssembly\" href=\"#webassembly\"\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\"\u003eIn the context of the \u003ca href=\"https://github.com/webassembly/esm-integration\"\u003eWebAssembly/ESM integration proposal\u003c/a\u003e: for imports of other module types from within a WebAssembly module, this proposal would introduce a new custom section (named \u003ccode\u003eimportattributes\u003c/code\u003e) that will annotate with attributes each imported module (which is listed in the import section).\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eProposed semantics and interoperability\u003c/h2\u003e\u003ca id=\"user-content-proposed-semantics-and-interoperability\" class=\"anchor\" aria-label=\"Permalink: Proposed semantics and interoperability\" href=\"#proposed-semantics-and-interoperability\"\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 proposal does not specify behavior for any particular attribute key or value. The \u003ca href=\"https://github.com/tc39/proposal-json-modules\"\u003eJSON modules proposal\u003c/a\u003e will specify that \u003ccode\u003etype: \"json\"\u003c/code\u003e must be interpreted as a JSON module, and will specify common semantics for doing so. It is expected the \u003ccode\u003etype\u003c/code\u003e attribute will be leveraged to support additional module types in future TC39 proposals as well as by hosts. HTML and CSS modules are under consideration, and these may use similar explicit \u003ccode\u003etype\u003c/code\u003e syntax when imported.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAttributes in addition than \u003ccode\u003etype\u003c/code\u003e may also be introduced for purposes not yet foreseen.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eJavaScript implementations are encouraged to reject attributes and type values which are not implemented in their environment (rather than ignoring them). This is to allow for maximal flexibility in the design space in the future--in particular, it enables new import attributes to be defined which change the interpretation of a module, without breaking backwards-compatibility.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFAQ\u003c/h2\u003e\u003ca id=\"user-content-faq\" class=\"anchor\" aria-label=\"Permalink: FAQ\" href=\"#faq\"\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\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWhy not out of band?\u003c/h3\u003e\u003ca id=\"user-content-why-not-out-of-band\" class=\"anchor\" aria-label=\"Permalink: Why not out of band?\" href=\"#why-not-out-of-band\"\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\"\u003eWhy not both? The champions of this proposal think that exploring both an in- and out of band solutions to various kinds of metadata. While we prefer in-band metadata for module types, we are happy to see the development of various out-of-band manifests of modules being proposed and implemented in certain JS environments:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/WICG/import-maps\"\u003eimport maps\u003c/a\u003e to map module specifiers to URLs/paths\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://nodejs.org/api/policy.html\" rel=\"nofollow\"\u003eNode.js policy files\u003c/a\u003e, e.g., to perform integrity checks on modules\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eThis proposal does not exclude out-of-band metadata being used for module types. And it definitely doesn't argue that all metadata should be in-band. For example, integrity hashes simply don't work in-band, both because module circularities make them impossible to calculate, and because of the need for a \"cascading\" update when a deep dependency changes.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eOut-of-band solutions face certain downsides; these are not necessarily fatal, but are interesting to take into account when considering the solution space and making tradeoffs:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003cstrong\u003eBy-hand authoring experience\u003c/strong\u003e: While an in-band solution is somewhat verbose, it is also more straightforward for developers to adopt when writing code without much tooling. For smaller projects developers do not need to create an extra file by hand.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eTooling complexity for large projects\u003c/strong\u003e: For large project with many dependencies, developers will not have to worry about creating a large manifest by compiling the metadata of all of their dependencies. Module authors will also not have to worry about shipping a manifest in order for consumers to be able to run their modules.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003ePerformance tradeoffs\u003c/strong\u003e: The experience in Node.js's experimental, out-of-band policy files is that they can carry significant startup cost, due to certain aspects of loading and parsing.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eHow is common behavior ensured across JavaScript environments?\u003c/h3\u003e\u003ca id=\"user-content-how-is-common-behavior-ensured-across-javascript-environments\" class=\"anchor\" aria-label=\"Permalink: How is common behavior ensured across JavaScript environments?\" href=\"#how-is-common-behavior-ensured-across-javascript-environments\"\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\"\u003eA central goal of this proposal is to share as much syntax and behavior across JavaScript environments as possible. To the same end, we also \u003ca href=\"https://github.com/tc39/proposal-json-modules\"\u003epropose\u003c/a\u003e a standardization of JSON modules to the extent that this is possible (omitting just the contents of the redundant type check, which necessarily differs between environments, in addition to the pre-existing host-defined parts such as interpreting the module specifier and fetching the module).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eHowever, at the same time, behavior of modules in general, and the set of module types specifically, is expected to differ across JavaScript environments. For example, WebAssembly, HTML and CSS modules may not make sense in certain minimal embedded JavaScript environments. We hope that environments can experiment and collaborate where it makes sense for them.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWe see the management of compatibility issues across environments as similar, independent of whether metadata is held in-band or out-of-band. An out of band solution would also suffer from the risk of inconsistent implementation or support across host environments if some kind of coordination does not occur.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe topic of attribute divergence is further discussed in \u003ca href=\"https://github.com/tc39/proposal-import-attributes/issues/34\" data-hovercard-type=\"issue\" data-hovercard-url=\"/tc39/proposal-import-attributes/issues/34/hovercard\"\u003e#34\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eHow would this proposal work with caching?\u003c/h3\u003e\u003ca id=\"user-content-how-would-this-proposal-work-with-caching\" class=\"anchor\" aria-label=\"Permalink: How would this proposal work with caching?\" href=\"#how-would-this-proposal-work-with-caching\"\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\"\u003eAttributes are part of the module cache key and can affect how a module is loaded: the cache key is extended from \u003cem\u003e(referrer, specifier)\u003c/em\u003e to \u003cem\u003e(referrer, specifier, attributes)\u003c/em\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWhy not use more terse syntax to indicate module types, like \u003ccode\u003eimport json from \"./foo.json\" as \"json\"\u003c/code\u003e?\u003c/h3\u003e\u003ca id=\"user-content-why-not-use-more-terse-syntax-to-indicate-module-types-like-import-json-from-foojson-as-json\" class=\"anchor\" aria-label=\"Permalink: Why not use more terse syntax to indicate module types, like import json from \u0026quot;./foo.json\u0026quot; as \u0026quot;json\u0026quot;?\" href=\"#why-not-use-more-terse-syntax-to-indicate-module-types-like-import-json-from-foojson-as-json\"\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\"\u003eAnother option considered and not selected has been to use a single string as the attribute, indicating the type. This option is not selected due to its implication that any particular attribute is special; even though this proposal only specifies the \u003ccode\u003etype\u003c/code\u003e attribute, the intention is to be open to more attributes in the future. (discussion in \u003ca href=\"https://github.com/tc39/proposal-import-attributes/issues/12\" data-hovercard-type=\"issue\" data-hovercard-url=\"/tc39/proposal-import-attributes/issues/12/hovercard\"\u003e#12\u003c/a\u003e).\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eShould more than just strings be supported as attribute values?\u003c/h3\u003e\u003ca id=\"user-content-should-more-than-just-strings-be-supported-as-attribute-values\" class=\"anchor\" aria-label=\"Permalink: Should more than just strings be supported as attribute values?\" href=\"#should-more-than-just-strings-be-supported-as-attribute-values\"\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\"\u003eWe could permit import attributes to have more complex values than simply strings, for example:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import value from \u0026quot;module\u0026quot; with { attr: { key1: \u0026quot;value1\u0026quot;, key2: [1, 2, 3] } };\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"module\"\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ewith\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eattr\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ekey1\u003c/span\u003e: \"\u003cspan class=\"pl-s1\"\u003evalue1\u003c/span\u003e\"\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ekey2\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e2\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e3\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-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis would allow import attributes to scale to support a larger variety of metadata.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWe propose to omit this generalization in the initial proposal, as a key/value list of strings already affords significant flexibility to start, but we're open to a follow-on proposal providing this kind of generalization.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWhat are you open to changing? When do we have to settle down on the details?\u003c/h3\u003e\u003ca id=\"user-content-what-are-you-open-to-changing-when-do-we-have-to-settle-down-on-the-details\" class=\"anchor\" aria-label=\"Permalink: What are you open to changing? When do we have to settle down on the details?\" href=\"#what-are-you-open-to-changing-when-do-we-have-to-settle-down-on-the-details\"\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\"\u003eWe are planning to make descisions and reach consensus during specific stages of this proposal. Here's our plan.\u003c/p\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cem\u003eOriginal plan before Stage 2 and Stage 3\u003c/em\u003e\u003c/summary\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBefore stage 2\u003c/h4\u003e\u003ca id=\"user-content-before-stage-2\" class=\"anchor\" aria-label=\"Permalink: Before stage 2\" href=\"#before-stage-2\"\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\"\u003eWe have achieved consensus on the following core decisions as part of Stage 2, including:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eThe attribute form; key-value or single string (\u003ca href=\"https://github.com/tc39/proposal-import-attributes/issues/12\" data-hovercard-type=\"issue\" data-hovercard-url=\"/tc39/proposal-import-attributes/issues/12/hovercard\"\u003e#12\u003c/a\u003e)\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"// Not selected\nimport value from \u0026quot;module\u0026quot; as \u0026quot;json\u0026quot;;\n\n// Not selected\nimport value from \u0026quot;module\u0026quot; with type: \u0026quot;json\u0026quot;;\n\n// Proposal that was approved from Stage 2 to Stage 3 the first time\nimport value from \u0026quot;module\u0026quot; assert { type: \u0026quot;json\u0026quot; };\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e// Not selected\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"module\"\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eas\u003c/span\u003e \"\u003cspan class=\"pl-s1\"\u003ejson\u003c/span\u003e\"\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// Not selected\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"module\"\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ewith\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003etype\u003c/span\u003e: \"\u003cspan class=\"pl-s1\"\u003ejson\u003c/span\u003e\"\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// Proposal that was approved from Stage 2 to Stage 3 the first time\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"module\"\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eassert\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003etype\u003c/span\u003e: \"\u003cspan class=\"pl-s1\"\u003ejson\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\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBefore stage 3\u003c/h4\u003e\u003ca id=\"user-content-before-stage-3\" class=\"anchor\" aria-label=\"Permalink: Before stage 3\" href=\"#before-stage-3\"\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\"\u003eAfter Stage 2 and before Stage 3, we're open to settling on some less core details, such as:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eConsidering alternatives for the \u003ccode\u003ewith\u003c/code\u003e/\u003ccode\u003eif\u003c/code\u003e/\u003ccode\u003eassert\u003c/code\u003e keywords (\u003ca href=\"https://github.com/tc39/proposal-import-attributes/issues/3\" data-hovercard-type=\"issue\" data-hovercard-url=\"/tc39/proposal-import-attributes/issues/3/hovercard\"\u003e#3\u003c/a\u003e)\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import value from \u0026quot;module\u0026quot; when { type: 'json' };\nimport value from \u0026quot;module\u0026quot; given { type: 'json' };\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"module\"\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ewhen\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003etype\u003c/span\u003e: '\u003cspan class=\"pl-s1\"\u003ejson\u003c/span\u003e' \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"module\"\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003egiven\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003etype\u003c/span\u003e: '\u003cspan class=\"pl-s1\"\u003ejson\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\u003cul dir=\"auto\"\u003e\n\u003cli\u003eHow dynamic import would accept import attributes:\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import(\u0026quot;foo.wasm\u0026quot;, { with: { type: \u0026quot;webassembly\u0026quot; } });\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"foo.wasm\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ewith\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etype\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"webassembly\"\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-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFor consistency the \u003ccode\u003eassert\u003c/code\u003e key is used for both dynamic and static imports.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAn alternative would be to remove the \u003ccode\u003eassert\u003c/code\u003e nesting in the object:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import(\u0026quot;foo.wasm\u0026quot;, { type: \u0026quot;webassembly\u0026quot; });\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"foo.wasm\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etype\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"webassembly\"\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\"\u003eHowever, that's not possible with the \u003ccode\u003eWorker\u003c/code\u003e API since it already uses an object with a \u003ccode\u003etype\u003c/code\u003e key as the second parameter. Which would make the APIs inconsistent.\u003c/p\u003e\n\u003c/details\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBefore Stage 4\u003c/h4\u003e\u003ca id=\"user-content-before-stage-4\" class=\"anchor\" aria-label=\"Permalink: Before Stage 4\" href=\"#before-stage-4\"\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\u003cul dir=\"auto\"\u003e\n\u003cli\u003eThe integration of import attributes into various host environments.\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eFor example, in the Web Platform, how import attributes would be enabled when launching a worker (if that is supported in the initial version to be shipped on the Web) or included in a \u003ccode\u003e\u0026lt;script\u0026gt;\u003c/code\u003e tag.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"new Worker(\u0026quot;foo.wasm\u0026quot;, { type: \u0026quot;module\u0026quot;, with: { type: \u0026quot;webassembly\u0026quot; } });\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eWorker\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"foo.wasm\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etype\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"module\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ewith\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etype\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"webassembly\"\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-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eStandardization here would consist of building consensus not just in TC39 but also in WHATWG HTML as well as the Node.js ESM effort and a general audit of semantic requirements across various host environments (\u003ca href=\"https://github.com/tc39/proposal-import-attributes/issues/10\" data-hovercard-type=\"issue\" data-hovercard-url=\"/tc39/proposal-import-attributes/issues/10/hovercard\"\u003e#10\u003c/a\u003e, \u003ca href=\"https://github.com/tc39/proposal-import-attributes/issues/24\" data-hovercard-type=\"issue\" data-hovercard-url=\"/tc39/proposal-import-attributes/issues/24/hovercard\"\u003e#24\u003c/a\u003e and \u003ca href=\"https://github.com/tc39/proposal-import-attributes/issues/25\" data-hovercard-type=\"issue\" data-hovercard-url=\"/tc39/proposal-import-attributes/issues/25/hovercard\"\u003e#25\u003c/a\u003e).\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eHistory\u003c/h2\u003e\u003ca id=\"user-content-history\" class=\"anchor\" aria-label=\"Permalink: History\" href=\"#history\"\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\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003cstrong\u003e2019-12\u003c/strong\u003e: The proposal, named \u003cem\u003emodule attributes\u003c/em\u003e is approved for Stage 1 (\u003ca href=\"https://github.com/tc39/notes/blob/c7fa95d3f2d0af68eaba9d388d5f79f2e166a4cc/meetings/2019-12/december-5.md#module-attributes-for-stage-1\"\u003enotes part 1\u003c/a\u003e, \u003ca href=\"https://github.com/tc39/notes/blob/c7fa95d3f2d0af68eaba9d388d5f79f2e166a4cc/meetings/2019-12/december-5.md#module-attributes-continuation-of-earlier-discussion\"\u003enotes part 2\u003c/a\u003e, \u003ca href=\"https://docs.google.com/presentation/d/1pyRtuOjnaTV_wr3a7sOZEt3PVxrbhgy_JCXovm0Dklk\" rel=\"nofollow\"\u003eslides\u003c/a\u003e) to explore metadata for module imports, and to explore guarantees about modules with no code execution.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003e2020-06\u003c/strong\u003e: \u003cem\u003eModule attributes\u003c/em\u003e advances to Stage 2 (\u003ca href=\"https://github.com/tc39/notes/blob/c7fa95d3f2d0af68eaba9d388d5f79f2e166a4cc/meetings/2020-06/june-3.md#module-attributes-for-stage-2\"\u003enotes part 1\u003c/a\u003e, \u003ca href=\"https://github.com/tc39/notes/blob/c7fa95d3f2d0af68eaba9d388d5f79f2e166a4cc/meetings/2020-06/june-4.md#continuation-module-attributes-for-stage-2\"\u003enotes part 2\u003c/a\u003e, \u003ca href=\"https://docs.google.com/presentation/d/1MOVBh0gw7-tqEx-maEvS2HsgwXd5X5pcwL80V67xCIg\" rel=\"nofollow\"\u003eslides\u003c/a\u003e), with consensus based on the restriction that import attributes cannot be part of the cache key in the modules map. The proposed syntax is \u003ccode\u003eimport { x } from \"./mod\" with type: \"json\", something: \"else\";\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003e2020-09\u003c/strong\u003e: The proposal, renamed to \u003cem\u003eimport assertions\u003c/em\u003e, advances to Stage 3 (\u003ca href=\"https://github.com/tc39/notes/blob/c7fa95d3f2d0af68eaba9d388d5f79f2e166a4cc/meetings/2020-09/sept-22.md#import-assertions-for-stage-3\"\u003enotes\u003c/a\u003e, \u003ca href=\"https://docs.google.com/presentation/d/1RuWMkNAatIZ6lhcdslD8cUD-zntioptqH1-hTbVlhzg\" rel=\"nofollow\"\u003eslides\u003c/a\u003e). The rename better describes the agreed assert-only semantics, and the keyword changes from \u003ccode\u003ewith\u003c/code\u003e to \u003ccode\u003eassert\u003c/code\u003e. However, the proposal relaxes the caching restriction so that HTML can still include the module type as part of the cache key, while still respecting the \"spirit\" of the proposal.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003e2021-05\u003c/strong\u003e–\u003cstrong\u003e2022-02\u003c/strong\u003e: The proposal, with the \u003ccode\u003eimport { x } from \"./mod\" assert { type: \"json\" };\u003c/code\u003e syntax, is implemented and shipped in Chrome, Node.js and Deno. They all support the \u003ca href=\"https://github.com/tc39/proposal-json-modules\"\u003eJSON modules\u003c/a\u003e proposal.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003e2023-01\u003c/strong\u003e: Due to \u003ca href=\"https://github.com/whatwg/html/issues/7233\" data-hovercard-type=\"issue\" data-hovercard-url=\"/whatwg/html/issues/7233/hovercard\"\u003eincompatibility\u003c/a\u003e with the semantics needed by HTML for non-JavaScript modules, specifically regarding HTTP fetching and CSPs, the proposal is demoted back to Stage 2 (\u003ca href=\"https://github.com/tc39/notes/blob/c7fa95d3f2d0af68eaba9d388d5f79f2e166a4cc/meetings/2023-01/jan-31.md#problems-with-import-assertions-for-module-types-and-a-possible-general-solution--downgrade-to-stage-2\"\u003enotes part 1\u003c/a\u003e, \u003ca href=\"https://github.com/tc39/notes/blob/c7fa95d3f2d0af68eaba9d388d5f79f2e166a4cc/meetings/2023-01/feb-02.md#import-assertions\"\u003enotes part 2\u003c/a\u003e, \u003ca href=\"https://docs.google.com/presentation/d/1HbWhyo4tSnpv4vMZqCa2YQvi_mKdpDi4JWWBtSUQqQY\" rel=\"nofollow\"\u003eslides\u003c/a\u003e) to investigate a solution to the web platform's needs.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003e2023-03\u003c/strong\u003e: The proposal is renamed to \u003cem\u003eImport attributes\u003c/em\u003e and moves back to Stage 3 (TODO: notes, \u003ca href=\"https://docs.google.com/presentation/d/1Abdr54Iflz_4sah2_yX2qS3K09qDJGV84qIZ6pHAqIk\" rel=\"nofollow\"\u003eslides\u003c/a\u003e). The restriction on the cache key is completely removed, and the keyword changes back from \u003ccode\u003eassert\u003c/code\u003e to \u003ccode\u003ewith\u003c/code\u003e: \u003ccode\u003eimport { x } from \"./mod\" with { type: \"json\" };\u003c/code\u003e. For compatibility with existing implementations, the \u003ccode\u003eassert\u003c/code\u003e keyword will still be supported until it's safe to remove it, if it will ever be.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSpecification\u003c/h2\u003e\u003ca id=\"user-content-specification\" class=\"anchor\" aria-label=\"Permalink: Specification\" href=\"#specification\"\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\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"https://tc39.es/proposal-import-attributes/\" rel=\"nofollow\"\u003eSpecification Outline\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/whatwg/html/pull/5658\" data-hovercard-type=\"pull_request\" data-hovercard-url=\"/whatwg/html/pull/5658/hovercard\"\u003ePull Request for HTML spec integration\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/article\u003e","loaded":true,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":[{"level":1,"text":"Import Attributes","anchor":"import-attributes","htmlText":"Import Attributes"},{"level":2,"text":"Synopsis","anchor":"synopsis","htmlText":"Synopsis"},{"level":2,"text":"Motivation","anchor":"motivation","htmlText":"Motivation"},{"level":2,"text":"Rationale","anchor":"rationale","htmlText":"Rationale"},{"level":2,"text":"Proposed syntax","anchor":"proposed-syntax","htmlText":"Proposed syntax"},{"level":3,"text":"import statements","anchor":"import-statements","htmlText":"import statements"},{"level":3,"text":"re-export statements","anchor":"re-export-statements","htmlText":"re-export statements"},{"level":3,"text":"dynamic import()","anchor":"dynamic-import","htmlText":"dynamic import()"},{"level":3,"text":"Integration of modules into environments","anchor":"integration-of-modules-into-environments","htmlText":"Integration of modules into environments"},{"level":4,"text":"Worker instantiation","anchor":"worker-instantiation","htmlText":"Worker instantiation"},{"level":4,"text":"HTML","anchor":"html","htmlText":"HTML"},{"level":4,"text":"WebAssembly","anchor":"webassembly","htmlText":"WebAssembly"},{"level":2,"text":"Proposed semantics and interoperability","anchor":"proposed-semantics-and-interoperability","htmlText":"Proposed semantics and interoperability"},{"level":2,"text":"FAQ","anchor":"faq","htmlText":"FAQ"},{"level":3,"text":"Why not out of band?","anchor":"why-not-out-of-band","htmlText":"Why not out of band?"},{"level":3,"text":"How is common behavior ensured across JavaScript environments?","anchor":"how-is-common-behavior-ensured-across-javascript-environments","htmlText":"How is common behavior ensured across JavaScript environments?"},{"level":3,"text":"How would this proposal work with caching?","anchor":"how-would-this-proposal-work-with-caching","htmlText":"How would this proposal work with caching?"},{"level":3,"text":"Why not use more terse syntax to indicate module types, like import json from \"./foo.json\" as \"json\"?","anchor":"why-not-use-more-terse-syntax-to-indicate-module-types-like-import-json-from-foojson-as-json","htmlText":"Why not use more terse syntax to indicate module types, like import json from \"./foo.json\" as \"json\"?"},{"level":3,"text":"Should more than just strings be supported as attribute values?","anchor":"should-more-than-just-strings-be-supported-as-attribute-values","htmlText":"Should more than just strings be supported as attribute values?"},{"level":3,"text":"What are you open to changing? When do we have to settle down on the details?","anchor":"what-are-you-open-to-changing-when-do-we-have-to-settle-down-on-the-details","htmlText":"What are you open to changing? When do we have to settle down on the details?"},{"level":4,"text":"Before stage 2","anchor":"before-stage-2","htmlText":"Before stage 2"},{"level":4,"text":"Before stage 3","anchor":"before-stage-3","htmlText":"Before stage 3"},{"level":4,"text":"Before Stage 4","anchor":"before-stage-4","htmlText":"Before Stage 4"},{"level":2,"text":"History","anchor":"history","htmlText":"History"},{"level":2,"text":"Specification","anchor":"specification","htmlText":"Specification"}],"siteNavLoginPath":"/login?return_to=https%3A%2F%2Fgithub.com%2Ftc39%2Fproposal-import-attributes"}},{"displayName":"CODE_OF_CONDUCT.md","repoName":".github","refName":"main","path":"CODE_OF_CONDUCT.md","preferredFileType":"code_of_conduct","tabName":"Code of conduct","richText":null,"loaded":false,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":null,"siteNavLoginPath":"/login?return_to=https%3A%2F%2Fgithub.com%2Ftc39%2Fproposal-import-attributes"}},{"displayName":"LICENSE","repoName":"proposal-import-attributes","refName":"master","path":"LICENSE","preferredFileType":"license","tabName":"Apache-2.0","richText":null,"loaded":false,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":null,"siteNavLoginPath":"/login?return_to=https%3A%2F%2Fgithub.com%2Ftc39%2Fproposal-import-attributes"}},{"displayName":"SECURITY.md","repoName":".github","refName":"main","path":"SECURITY.md","preferredFileType":"security","tabName":"Security","richText":null,"loaded":false,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":null,"siteNavLoginPath":"/login?return_to=https%3A%2F%2Fgithub.com%2Ftc39%2Fproposal-import-attributes"}}],"overviewFilesProcessingTime":0}},"appPayload":{"helpUrl":"https://docs.github.com","findFileWorkerPath":"/assets-cdn/worker/find-file-worker-1583894afd38.js","findInFileWorkerPath":"/assets-cdn/worker/find-in-file-worker-67668e8c2caa.js","githubDevUrl":null,"enabled_features":{"code_nav_ui_events":false,"overview_shared_code_dropdown_button":false,"react_blob_overlay":false,"copilot_conversational_ux_embedding_update":false,"copilot_smell_icebreaker_ux":true,"copilot_workspace":false,"accessible_code_button":true}}}}</script> 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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">Champions: Sven Sauleau (<a href="https://github.com/xtuc">@xtuc</a>), Daniel Ehrenberg (<a href="https://github.com/littledan">@littledan</a>), Myles Borins (<a href="https://github.com/MylesBorins">@MylesBorins</a>), Dan Clark (<a href="https://github.com/dandclark">@dandclark</a>), and Nicolò Ribaudo (<a href="https://github.com/nicolo-ribaudo">@nicolo-ribaudo</a>).</p> <p dir="auto">Status: Stage 3</p> <blockquote> <p dir="auto"><g-emoji class="g-emoji" alias="warning">⚠️</g-emoji> The specification in this proposal might be out of date. <a href="https://github.com/tc39/ecma262/pull/3057" data-hovercard-type="pull_request" data-hovercard-url="/tc39/ecma262/pull/3057/hovercard">tc39/ecma262#3057</a> is the latest version.</p> <p dir="auto">Some of the changes present in the current specification have not been presented to committee yet: <a href="https://github.com/tc39/proposal-import-attributes/issues/142" data-hovercard-type="issue" data-hovercard-url="/tc39/proposal-import-attributes/issues/142/hovercard">#142</a></p> </blockquote> <p dir="auto">Please leave any feedback you have in the <a href="http://github.com/tc39/proposal-import-attributes/issues">issues</a>!</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Synopsis</h2><a id="user-content-synopsis" class="anchor" aria-label="Permalink: Synopsis" href="#synopsis"><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 Import Attributes proposal, formerly known as Import Assertions, adds an inline syntax for module import statements to pass on more information alongside the module specifier. The initial application for such attributes will be to support additional types of modules in a common way across JavaScript environments, starting with <a href="http://github.com/tc39/proposal-json-modules">JSON modules</a>.</p> <p dir="auto">The syntax will be as follows (shown here is the proposed method for importing a JSON module):</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import json from &quot;./foo.json&quot; with { type: &quot;json&quot; }; import(&quot;foo.json&quot;, { with: { type: &quot;json&quot; } });"><pre><span class="pl-k">import</span> <span class="pl-s1">json</span> <span class="pl-k">from</span> <span class="pl-s">"./foo.json"</span> <span class="pl-s1">with</span> <span class="pl-kos">{</span> <span class="pl-s1">type</span>: "<span class="pl-s1">json</span>" <span class="pl-kos">}</span><span class="pl-kos">;</span> <span class="pl-k">import</span><span class="pl-kos">(</span><span class="pl-s">"foo.json"</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">with</span>: <span class="pl-kos">{</span> <span class="pl-c1">type</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-kos">;</span></pre></div> <p dir="auto">The specification of JSON modules was originally part of this proposal, but it was <a href="https://github.com/tc39/notes/blob/master/meetings/2020-07/july-21.md#import-conditions-for-stage-3">resolved</a> during the July 2020 meeting to split JSON modules out into a <a href="http://github.com/tc39/proposal-json-modules">separate Stage 3 proposal</a>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Motivation</h2><a id="user-content-motivation" class="anchor" aria-label="Permalink: Motivation" href="#motivation"><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">Standards-track JSON ES modules were <a href="https://github.com/w3c/webcomponents/issues/770" data-hovercard-type="issue" data-hovercard-url="/WICG/webcomponents/issues/770/hovercard">proposed</a> to allow JavaScript modules to easily import JSON data files, similarly to how they are supported in many nonstandard JavaScript module systems. This idea quickly got broad support from web developers and browsers, and was merged into HTML, with an implementation for V8/Chromium created by Microsoft.</p> <p dir="auto">However, in <a href="https://github.com/w3c/webcomponents/issues/839" data-hovercard-type="issue" data-hovercard-url="/WICG/webcomponents/issues/839/hovercard">an issue</a>, Ryosuke Niwa (Apple) and Anne van Kesteren (Mozilla) proposed that security would be improved if some syntactic marker were required when importing JSON modules and similar module types which cannot execute code, to prevent a scenario where the responding server unexpectedly provides a different MIME type, causing code to be unexpectedly executed. The solution was to somehow indicate that a module was JSON, or in general, not to be executed, somewhere in addition to the MIME type.</p> <p dir="auto">Some developers have the intuition that the file extension could be used to determine the module type, as it is in many existing non-standard module systems. However, it's a deep web architectural principle that the suffix of the URL (which you might think of as the "file extension" outside of the web) does not lead to semantics of how the page is interpreted. In practice, on the web, there is a widespread <a href="/tc39/proposal-import-attributes/blob/master/content-type-vs-file-extension.md">mismatch between file extension and the HTTP Content Type header</a>. All of this sums up to it being infeasible to depend on file extensions/suffixes included in the module specifier to be the basis for this checking.</p> <p dir="auto">There are other possible pieces of metadata which could be associated with modules, see <a href="https://github.com/tc39/proposal-import-attributes/issues/8" data-hovercard-type="issue" data-hovercard-url="/tc39/proposal-import-attributes/issues/8/hovercard">#8</a> and <a href="https://github.com/tc39/proposal-import-reflection/issues/18" data-hovercard-type="issue" data-hovercard-url="/tc39/proposal-source-phase-imports/issues/18/hovercard">tc39/proposal-import-reflection#18</a> for further discussion.</p> <p dir="auto">Proposed ES module types that are blocked by this security concern, in addition to JSON modules, include <a href="https://github.com/whatwg/html/pull/4898" data-hovercard-type="pull_request" data-hovercard-url="/whatwg/html/pull/4898/hovercard">CSS modules</a> and potentially <a href="https://github.com/whatwg/html/pull/4505" data-hovercard-type="pull_request" data-hovercard-url="/whatwg/html/pull/4505/hovercard">HTML modules</a> if the HTML module proposal is restricted to <a href="https://github.com/w3c/webcomponents/issues/805" data-hovercard-type="issue" data-hovercard-url="/WICG/webcomponents/issues/805/hovercard">not allow script</a>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Rationale</h2><a id="user-content-rationale" class="anchor" aria-label="Permalink: Rationale" href="#rationale"><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">There are three places where this data could be provided:</p> <ul dir="auto"> <li>As part of the module specifier (e.g., as a pseudo-scheme) <ul dir="auto"> <li>Challenges: Adds complexity to URLs or other module specifier syntaxes, and risks being confusing to developers (further discussion: <a href="https://github.com/tc39/proposal-import-attributes/issues/11" data-hovercard-type="issue" data-hovercard-url="/tc39/proposal-import-attributes/issues/11/hovercard">#11</a>)</li> <li>webpack supports this sort of construct (<a href="https://webpack.js.org/concepts/loaders/#inline" rel="nofollow">docs</a>). <ul dir="auto"> <li>Demand from users for similar behavior in Parcel, with pushback from some maintainers (<a href="https://github.com/parcel-bundler/parcel/issues/3477" data-hovercard-type="issue" data-hovercard-url="/parcel-bundler/parcel/issues/3477/hovercard">#3477</a>)</li> </ul> </li> </ul> </li> <li>Separately, out of band (e.g., a separate resource file) <ul dir="auto"> <li>Challenges: How to load that resource file; what should the format be; unergonomic to have to jump between files during development (further discussion: <a href="https://github.com/tc39/proposal-import-attributes/issues/13" data-hovercard-type="issue" data-hovercard-url="/tc39/proposal-import-attributes/issues/13/hovercard">#13</a>)</li> </ul> </li> <li>In the JavaScript source text <ul dir="auto"> <li>Challenges: Requires a change at the JavaScript language level (this proposal)</li> </ul> </li> </ul> <p dir="auto">This proposal pursues the third option, as we expect it to lead to the best developer experience, and are hopeful that language design/standardization issues can be resolved.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Proposed syntax</h2><a id="user-content-proposed-syntax" class="anchor" aria-label="Permalink: Proposed syntax" href="#proposed-syntax"><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">Import attributes have to be made available in several different contexts. They use a key-value syntax is used preceded by the <code>with</code> keyword, with the key <code>type</code> used as an example indicating the module type. Such key-value syntax can be used in various different contexts.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">import statements</h3><a id="user-content-import-statements" class="anchor" aria-label="Permalink: import statements" href="#import-statements"><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 ImportDeclaration would allow any arbitrary attributes after the <code>with</code> keyword.</p> <p dir="auto">For example, the <code>type</code> attribute could be used to indicate a module type, for example importing a JSON module with the following syntax.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import json from &quot;./foo.json&quot; with { type: &quot;json&quot; };"><pre><span class="pl-k">import</span> <span class="pl-s1">json</span> <span class="pl-k">from</span> <span class="pl-s">"./foo.json"</span> <span class="pl-s1">with</span> <span class="pl-kos">{</span> <span class="pl-s1">type</span>: "<span class="pl-s1">json</span>" <span class="pl-kos">}</span><span class="pl-kos">;</span></pre></div> <p dir="auto">The <code>with</code> syntax in the <code>ImportDeclaration</code> statement uses curly braces, for the following reasons (as discussed in <a href="https://github.com/tc39/proposal-import-attributes/issues/5" data-hovercard-type="issue" data-hovercard-url="/tc39/proposal-import-attributes/issues/5/hovercard">#5</a>):</p> <ul dir="auto"> <li>JavaScript developers are already used to the Object literal syntax and since it allows a trailing comma copy/pasting attributes will be easy.</li> <li>it clearly indicates the end of the attributes list when splitting them across multiple lines.</li> </ul> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">re-export statements</h3><a id="user-content-re-export-statements" class="anchor" aria-label="Permalink: re-export statements" href="#re-export-statements"><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">Similar to import statements, the ExportDeclaration, when re-exporting from another module, would allow any arbitrary attributes after the <code>with</code> keyword.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="export { val } from './foo.js' with { type: &quot;javascript&quot; };"><pre><span class="pl-k">export</span> <span class="pl-kos">{</span> <span class="pl-s1">val</span> <span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'./foo.js'</span> <span class="pl-s1">with</span> <span class="pl-kos">{</span> type: <span class="pl-s">"javascript"</span> <span class="pl-kos">}</span><span class="pl-kos">;</span></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">dynamic import()</h3><a id="user-content-dynamic-import" class="anchor" aria-label="Permalink: dynamic import()" href="#dynamic-import"><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 <code>import()</code> pseudo-function would allow import attributes to be indicated in an options bag in the second argument.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import(&quot;foo.json&quot;, { with: { type: &quot;json&quot; } })"><pre><span class="pl-k">import</span><span class="pl-kos">(</span><span class="pl-s">"foo.json"</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">with</span>: <span class="pl-kos">{</span> <span class="pl-c1">type</span>: <span class="pl-s">"json"</span> <span class="pl-kos">}</span> <span class="pl-kos">}</span><span class="pl-kos">)</span></pre></div> <p dir="auto">The second parameter to <code>import()</code> is an options bag, with the only option currently defined to be <code>with</code>: the value here is an object containing the import attributes. There are other proposals for entries to put in the options bag: for example, the <a href="https://github.com/tc39/proposal-import-reflection">Module Source Imports</a> proposal introduces a <code>phase</code> property.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Integration of modules into environments</h3><a id="user-content-integration-of-modules-into-environments" class="anchor" aria-label="Permalink: Integration of modules into environments" href="#integration-of-modules-into-environments"><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">Host environments (e.g., the Web platform, Node.js) often provide various different ways of loading modules. The analogous string could be passed through these ways of loading other kinds of modules.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Worker instantiation</h4><a id="user-content-worker-instantiation" class="anchor" aria-label="Permalink: Worker instantiation" href="#worker-instantiation"><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> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="new Worker(&quot;foo.wasm&quot;, { type: &quot;module&quot;, with: { type: &quot;webassembly&quot; } });"><pre><span class="pl-k">new</span> <span class="pl-v">Worker</span><span class="pl-kos">(</span><span class="pl-s">"foo.wasm"</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">type</span>: <span class="pl-s">"module"</span><span class="pl-kos">,</span> <span class="pl-c1">with</span>: <span class="pl-kos">{</span> <span class="pl-c1">type</span>: <span class="pl-s">"webassembly"</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">Sidebar about WebAssembly module types and the web: it's still uncertain whether importing WebAssembly modules would need to be marked specially, or would be imported just like JavaScript. Further discussion in <a href="https://github.com/tc39/proposal-import-attributes/issues/19" data-hovercard-type="issue" data-hovercard-url="/tc39/proposal-import-attributes/issues/19/hovercard">#19</a>.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">HTML</h4><a id="user-content-html" class="anchor" aria-label="Permalink: HTML" href="#html"><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">Although changes to HTML won't be specified by TC39, an idea here would be that each import attribute, preceded by <code>with</code>, becomes an HTML attribute which could be used in script tags.</p> <div class="highlight highlight-text-html-basic notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="&lt;script src=&quot;foo.wasm&quot; type=&quot;module&quot; withtype=&quot;webassembly&quot;&gt;&lt;/script&gt;"><pre><span class="pl-kos">&lt;</span><span class="pl-ent">script</span> <span class="pl-c1">src</span>="<span class="pl-s">foo.wasm</span>" <span class="pl-c1">type</span>="<span class="pl-s">module</span>" <span class="pl-c1">withtype</span>="<span class="pl-s">webassembly</span>"<span class="pl-kos">&gt;</span><span class="pl-kos">&lt;/</span><span class="pl-ent">script</span><span class="pl-kos">&gt;</span></pre></div> <p dir="auto">(See the caveat about WebAssembly above.)</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">WebAssembly</h4><a id="user-content-webassembly" class="anchor" aria-label="Permalink: WebAssembly" href="#webassembly"><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">In the context of the <a href="https://github.com/webassembly/esm-integration">WebAssembly/ESM integration proposal</a>: for imports of other module types from within a WebAssembly module, this proposal would introduce a new custom section (named <code>importattributes</code>) that will annotate with attributes each imported module (which is listed in the import section).</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Proposed semantics and interoperability</h2><a id="user-content-proposed-semantics-and-interoperability" class="anchor" aria-label="Permalink: Proposed semantics and interoperability" href="#proposed-semantics-and-interoperability"><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 proposal does not specify behavior for any particular attribute key or value. The <a href="https://github.com/tc39/proposal-json-modules">JSON modules proposal</a> will specify that <code>type: "json"</code> must be interpreted as a JSON module, and will specify common semantics for doing so. It is expected the <code>type</code> attribute will be leveraged to support additional module types in future TC39 proposals as well as by hosts. HTML and CSS modules are under consideration, and these may use similar explicit <code>type</code> syntax when imported.</p> <p dir="auto">Attributes in addition than <code>type</code> may also be introduced for purposes not yet foreseen.</p> <p dir="auto">JavaScript implementations are encouraged to reject attributes and type values which are not implemented in their environment (rather than ignoring them). This is to allow for maximal flexibility in the design space in the future--in particular, it enables new import attributes to be defined which change the interpretation of a module, without breaking backwards-compatibility.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">FAQ</h2><a id="user-content-faq" class="anchor" aria-label="Permalink: FAQ" href="#faq"><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> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Why not out of band?</h3><a id="user-content-why-not-out-of-band" class="anchor" aria-label="Permalink: Why not out of band?" href="#why-not-out-of-band"><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">Why not both? The champions of this proposal think that exploring both an in- and out of band solutions to various kinds of metadata. While we prefer in-band metadata for module types, we are happy to see the development of various out-of-band manifests of modules being proposed and implemented in certain JS environments:</p> <ul dir="auto"> <li><a href="https://github.com/WICG/import-maps">import maps</a> to map module specifiers to URLs/paths</li> <li><a href="https://nodejs.org/api/policy.html" rel="nofollow">Node.js policy files</a>, e.g., to perform integrity checks on modules</li> </ul> <p dir="auto">This proposal does not exclude out-of-band metadata being used for module types. And it definitely doesn't argue that all metadata should be in-band. For example, integrity hashes simply don't work in-band, both because module circularities make them impossible to calculate, and because of the need for a "cascading" update when a deep dependency changes.</p> <p dir="auto">Out-of-band solutions face certain downsides; these are not necessarily fatal, but are interesting to take into account when considering the solution space and making tradeoffs:</p> <ul dir="auto"> <li><strong>By-hand authoring experience</strong>: While an in-band solution is somewhat verbose, it is also more straightforward for developers to adopt when writing code without much tooling. For smaller projects developers do not need to create an extra file by hand.</li> <li><strong>Tooling complexity for large projects</strong>: For large project with many dependencies, developers will not have to worry about creating a large manifest by compiling the metadata of all of their dependencies. Module authors will also not have to worry about shipping a manifest in order for consumers to be able to run their modules.</li> <li><strong>Performance tradeoffs</strong>: The experience in Node.js's experimental, out-of-band policy files is that they can carry significant startup cost, due to certain aspects of loading and parsing.</li> </ul> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">How is common behavior ensured across JavaScript environments?</h3><a id="user-content-how-is-common-behavior-ensured-across-javascript-environments" class="anchor" aria-label="Permalink: How is common behavior ensured across JavaScript environments?" href="#how-is-common-behavior-ensured-across-javascript-environments"><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">A central goal of this proposal is to share as much syntax and behavior across JavaScript environments as possible. To the same end, we also <a href="https://github.com/tc39/proposal-json-modules">propose</a> a standardization of JSON modules to the extent that this is possible (omitting just the contents of the redundant type check, which necessarily differs between environments, in addition to the pre-existing host-defined parts such as interpreting the module specifier and fetching the module).</p> <p dir="auto">However, at the same time, behavior of modules in general, and the set of module types specifically, is expected to differ across JavaScript environments. For example, WebAssembly, HTML and CSS modules may not make sense in certain minimal embedded JavaScript environments. We hope that environments can experiment and collaborate where it makes sense for them.</p> <p dir="auto">We see the management of compatibility issues across environments as similar, independent of whether metadata is held in-band or out-of-band. An out of band solution would also suffer from the risk of inconsistent implementation or support across host environments if some kind of coordination does not occur.</p> <p dir="auto">The topic of attribute divergence is further discussed in <a href="https://github.com/tc39/proposal-import-attributes/issues/34" data-hovercard-type="issue" data-hovercard-url="/tc39/proposal-import-attributes/issues/34/hovercard">#34</a>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">How would this proposal work with caching?</h3><a id="user-content-how-would-this-proposal-work-with-caching" class="anchor" aria-label="Permalink: How would this proposal work with caching?" href="#how-would-this-proposal-work-with-caching"><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">Attributes are part of the module cache key and can affect how a module is loaded: the cache key is extended from <em>(referrer, specifier)</em> to <em>(referrer, specifier, attributes)</em>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Why not use more terse syntax to indicate module types, like <code>import json from "./foo.json" as "json"</code>?</h3><a id="user-content-why-not-use-more-terse-syntax-to-indicate-module-types-like-import-json-from-foojson-as-json" class="anchor" aria-label="Permalink: Why not use more terse syntax to indicate module types, like import json from &quot;./foo.json&quot; as &quot;json&quot;?" href="#why-not-use-more-terse-syntax-to-indicate-module-types-like-import-json-from-foojson-as-json"><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">Another option considered and not selected has been to use a single string as the attribute, indicating the type. This option is not selected due to its implication that any particular attribute is special; even though this proposal only specifies the <code>type</code> attribute, the intention is to be open to more attributes in the future. (discussion in <a href="https://github.com/tc39/proposal-import-attributes/issues/12" data-hovercard-type="issue" data-hovercard-url="/tc39/proposal-import-attributes/issues/12/hovercard">#12</a>).</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Should more than just strings be supported as attribute values?</h3><a id="user-content-should-more-than-just-strings-be-supported-as-attribute-values" class="anchor" aria-label="Permalink: Should more than just strings be supported as attribute values?" href="#should-more-than-just-strings-be-supported-as-attribute-values"><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">We could permit import attributes to have more complex values than simply strings, for example:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import value from &quot;module&quot; with { attr: { key1: &quot;value1&quot;, key2: [1, 2, 3] } };"><pre><span class="pl-k">import</span> <span class="pl-s1">value</span> <span class="pl-k">from</span> <span class="pl-s">"module"</span> <span class="pl-s1">with</span> <span class="pl-kos">{</span> <span class="pl-s1">attr</span>: <span class="pl-kos">{</span> <span class="pl-s1">key1</span>: "<span class="pl-s1">value1</span>"<span class="pl-kos">,</span> <span class="pl-s1">key2</span>: <span class="pl-kos">[</span><span class="pl-c1">1</span><span class="pl-kos">,</span> <span class="pl-c1">2</span><span class="pl-kos">,</span> <span class="pl-c1">3</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">This would allow import attributes to scale to support a larger variety of metadata.</p> <p dir="auto">We propose to omit this generalization in the initial proposal, as a key/value list of strings already affords significant flexibility to start, but we're open to a follow-on proposal providing this kind of generalization.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">What are you open to changing? When do we have to settle down on the details?</h3><a id="user-content-what-are-you-open-to-changing-when-do-we-have-to-settle-down-on-the-details" class="anchor" aria-label="Permalink: What are you open to changing? When do we have to settle down on the details?" href="#what-are-you-open-to-changing-when-do-we-have-to-settle-down-on-the-details"><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">We are planning to make descisions and reach consensus during specific stages of this proposal. Here's our plan.</p> <details> <summary><em>Original plan before Stage 2 and Stage 3</em></summary> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Before stage 2</h4><a id="user-content-before-stage-2" class="anchor" aria-label="Permalink: Before stage 2" href="#before-stage-2"><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">We have achieved consensus on the following core decisions as part of Stage 2, including:</p> <ul dir="auto"> <li>The attribute form; key-value or single string (<a href="https://github.com/tc39/proposal-import-attributes/issues/12" data-hovercard-type="issue" data-hovercard-url="/tc39/proposal-import-attributes/issues/12/hovercard">#12</a>)</li> </ul> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="// Not selected import value from &quot;module&quot; as &quot;json&quot;; // Not selected import value from &quot;module&quot; with type: &quot;json&quot;; // Proposal that was approved from Stage 2 to Stage 3 the first time import value from &quot;module&quot; assert { type: &quot;json&quot; };"><pre><span class="pl-c">// Not selected</span> <span class="pl-k">import</span> <span class="pl-s1">value</span> <span class="pl-k">from</span> <span class="pl-s">"module"</span> <span class="pl-s1">as</span> "<span class="pl-s1">json</span>"<span class="pl-kos">;</span> <span class="pl-c">// Not selected</span> <span class="pl-k">import</span> <span class="pl-s1">value</span> <span class="pl-k">from</span> <span class="pl-s">"module"</span> <span class="pl-s1">with</span> <span class="pl-s1">type</span>: "<span class="pl-s1">json</span>"<span class="pl-kos">;</span> <span class="pl-c">// Proposal that was approved from Stage 2 to Stage 3 the first time</span> <span class="pl-k">import</span> <span class="pl-s1">value</span> <span class="pl-k">from</span> <span class="pl-s">"module"</span> <span class="pl-s1">assert</span> <span class="pl-kos">{</span> <span class="pl-s1">type</span>: "<span class="pl-s1">json</span>" <span class="pl-kos">}</span><span class="pl-kos">;</span></pre></div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Before stage 3</h4><a id="user-content-before-stage-3" class="anchor" aria-label="Permalink: Before stage 3" href="#before-stage-3"><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">After Stage 2 and before Stage 3, we're open to settling on some less core details, such as:</p> <ul dir="auto"> <li>Considering alternatives for the <code>with</code>/<code>if</code>/<code>assert</code> keywords (<a href="https://github.com/tc39/proposal-import-attributes/issues/3" data-hovercard-type="issue" data-hovercard-url="/tc39/proposal-import-attributes/issues/3/hovercard">#3</a>)</li> </ul> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import value from &quot;module&quot; when { type: 'json' }; import value from &quot;module&quot; given { type: 'json' };"><pre><span class="pl-k">import</span> <span class="pl-s1">value</span> <span class="pl-k">from</span> <span class="pl-s">"module"</span> <span class="pl-s1">when</span> <span class="pl-kos">{</span> <span class="pl-s1">type</span>: '<span class="pl-s1">json</span>' <span class="pl-kos">}</span><span class="pl-kos">;</span> <span class="pl-k">import</span> <span class="pl-s1">value</span> <span class="pl-k">from</span> <span class="pl-s">"module"</span> <span class="pl-s1">given</span> <span class="pl-kos">{</span> <span class="pl-s1">type</span>: '<span class="pl-s1">json</span>' <span class="pl-kos">}</span><span class="pl-kos">;</span></pre></div> <ul dir="auto"> <li>How dynamic import would accept import attributes:</li> </ul> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import(&quot;foo.wasm&quot;, { with: { type: &quot;webassembly&quot; } });"><pre><span class="pl-k">import</span><span class="pl-kos">(</span><span class="pl-s">"foo.wasm"</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">with</span>: <span class="pl-kos">{</span> <span class="pl-c1">type</span>: <span class="pl-s">"webassembly"</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">For consistency the <code>assert</code> key is used for both dynamic and static imports.</p> <p dir="auto">An alternative would be to remove the <code>assert</code> nesting in the object:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import(&quot;foo.wasm&quot;, { type: &quot;webassembly&quot; });"><pre><span class="pl-k">import</span><span class="pl-kos">(</span><span class="pl-s">"foo.wasm"</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">type</span>: <span class="pl-s">"webassembly"</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <p dir="auto">However, that's not possible with the <code>Worker</code> API since it already uses an object with a <code>type</code> key as the second parameter. Which would make the APIs inconsistent.</p> </details> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Before Stage 4</h4><a id="user-content-before-stage-4" class="anchor" aria-label="Permalink: Before Stage 4" href="#before-stage-4"><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> <ul dir="auto"> <li>The integration of import attributes into various host environments. <ul dir="auto"> <li>For example, in the Web Platform, how import attributes would be enabled when launching a worker (if that is supported in the initial version to be shipped on the Web) or included in a <code>&lt;script&gt;</code> tag.</li> </ul> </li> </ul> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="new Worker(&quot;foo.wasm&quot;, { type: &quot;module&quot;, with: { type: &quot;webassembly&quot; } });"><pre><span class="pl-k">new</span> <span class="pl-v">Worker</span><span class="pl-kos">(</span><span class="pl-s">"foo.wasm"</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">type</span>: <span class="pl-s">"module"</span><span class="pl-kos">,</span> <span class="pl-c1">with</span>: <span class="pl-kos">{</span> <span class="pl-c1">type</span>: <span class="pl-s">"webassembly"</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">Standardization here would consist of building consensus not just in TC39 but also in WHATWG HTML as well as the Node.js ESM effort and a general audit of semantic requirements across various host environments (<a href="https://github.com/tc39/proposal-import-attributes/issues/10" data-hovercard-type="issue" data-hovercard-url="/tc39/proposal-import-attributes/issues/10/hovercard">#10</a>, <a href="https://github.com/tc39/proposal-import-attributes/issues/24" data-hovercard-type="issue" data-hovercard-url="/tc39/proposal-import-attributes/issues/24/hovercard">#24</a> and <a href="https://github.com/tc39/proposal-import-attributes/issues/25" data-hovercard-type="issue" data-hovercard-url="/tc39/proposal-import-attributes/issues/25/hovercard">#25</a>).</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">History</h2><a id="user-content-history" class="anchor" aria-label="Permalink: History" href="#history"><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> <ul dir="auto"> <li><strong>2019-12</strong>: The proposal, named <em>module attributes</em> is approved for Stage 1 (<a href="https://github.com/tc39/notes/blob/c7fa95d3f2d0af68eaba9d388d5f79f2e166a4cc/meetings/2019-12/december-5.md#module-attributes-for-stage-1">notes part 1</a>, <a href="https://github.com/tc39/notes/blob/c7fa95d3f2d0af68eaba9d388d5f79f2e166a4cc/meetings/2019-12/december-5.md#module-attributes-continuation-of-earlier-discussion">notes part 2</a>, <a href="https://docs.google.com/presentation/d/1pyRtuOjnaTV_wr3a7sOZEt3PVxrbhgy_JCXovm0Dklk" rel="nofollow">slides</a>) to explore metadata for module imports, and to explore guarantees about modules with no code execution.</li> <li><strong>2020-06</strong>: <em>Module attributes</em> advances to Stage 2 (<a href="https://github.com/tc39/notes/blob/c7fa95d3f2d0af68eaba9d388d5f79f2e166a4cc/meetings/2020-06/june-3.md#module-attributes-for-stage-2">notes part 1</a>, <a href="https://github.com/tc39/notes/blob/c7fa95d3f2d0af68eaba9d388d5f79f2e166a4cc/meetings/2020-06/june-4.md#continuation-module-attributes-for-stage-2">notes part 2</a>, <a href="https://docs.google.com/presentation/d/1MOVBh0gw7-tqEx-maEvS2HsgwXd5X5pcwL80V67xCIg" rel="nofollow">slides</a>), with consensus based on the restriction that import attributes cannot be part of the cache key in the modules map. The proposed syntax is <code>import { x } from "./mod" with type: "json", something: "else";</code>.</li> <li><strong>2020-09</strong>: The proposal, renamed to <em>import assertions</em>, advances to Stage 3 (<a href="https://github.com/tc39/notes/blob/c7fa95d3f2d0af68eaba9d388d5f79f2e166a4cc/meetings/2020-09/sept-22.md#import-assertions-for-stage-3">notes</a>, <a href="https://docs.google.com/presentation/d/1RuWMkNAatIZ6lhcdslD8cUD-zntioptqH1-hTbVlhzg" rel="nofollow">slides</a>). The rename better describes the agreed assert-only semantics, and the keyword changes from <code>with</code> to <code>assert</code>. However, the proposal relaxes the caching restriction so that HTML can still include the module type as part of the cache key, while still respecting the "spirit" of the proposal.</li> <li><strong>2021-05</strong>–<strong>2022-02</strong>: The proposal, with the <code>import { x } from "./mod" assert { type: "json" };</code> syntax, is implemented and shipped in Chrome, Node.js and Deno. They all support the <a href="https://github.com/tc39/proposal-json-modules">JSON modules</a> proposal.</li> <li><strong>2023-01</strong>: Due to <a href="https://github.com/whatwg/html/issues/7233" data-hovercard-type="issue" data-hovercard-url="/whatwg/html/issues/7233/hovercard">incompatibility</a> with the semantics needed by HTML for non-JavaScript modules, specifically regarding HTTP fetching and CSPs, the proposal is demoted back to Stage 2 (<a href="https://github.com/tc39/notes/blob/c7fa95d3f2d0af68eaba9d388d5f79f2e166a4cc/meetings/2023-01/jan-31.md#problems-with-import-assertions-for-module-types-and-a-possible-general-solution--downgrade-to-stage-2">notes part 1</a>, <a href="https://github.com/tc39/notes/blob/c7fa95d3f2d0af68eaba9d388d5f79f2e166a4cc/meetings/2023-01/feb-02.md#import-assertions">notes part 2</a>, <a href="https://docs.google.com/presentation/d/1HbWhyo4tSnpv4vMZqCa2YQvi_mKdpDi4JWWBtSUQqQY" rel="nofollow">slides</a>) to investigate a solution to the web platform's needs.</li> <li><strong>2023-03</strong>: The proposal is renamed to <em>Import attributes</em> and moves back to Stage 3 (TODO: notes, <a href="https://docs.google.com/presentation/d/1Abdr54Iflz_4sah2_yX2qS3K09qDJGV84qIZ6pHAqIk" rel="nofollow">slides</a>). The restriction on the cache key is completely removed, and the keyword changes back from <code>assert</code> to <code>with</code>: <code>import { x } from "./mod" with { type: "json" };</code>. For compatibility with existing implementations, the <code>assert</code> keyword will still be supported until it's safe to remove it, if it will ever be.</li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Specification</h2><a id="user-content-specification" class="anchor" aria-label="Permalink: Specification" href="#specification"><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> <ul dir="auto"> <li><a href="https://tc39.es/proposal-import-attributes/" rel="nofollow">Specification Outline</a></li> <li><a href="https://github.com/whatwg/html/pull/5658" data-hovercard-type="pull_request" data-hovercard-url="/whatwg/html/pull/5658/hovercard">Pull Request for HTML spec integration</a></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="3Xlo0zLigbMjFbNKZpDqzVRgc83j1LrfuKknAczUdO3pC3u2wxGKrvANkfn/JuuGBY9fBeTzMY2a1/HdNR6d8g==" /> </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"> Proposal for syntax to import ES modules with 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1-1.088-.79l.72-4.194L.818 6.374a.75.75 0 0 1 .416-1.28l4.21-.611L7.327.668A.75.75 0 0 1 8 .25Zm0 2.445L6.615 5.5a.75.75 0 0 1-.564.41l-3.097.45 2.24 2.184a.75.75 0 0 1 .216.664l-.528 3.084 2.769-1.456a.75.75 0 0 1 .698 0l2.77 1.456-.53-3.084a.75.75 0 0 1 .216-.664l2.24-2.183-3.096-.45a.75.75 0 0 1-.564-.41L8 2.694Z"></path> </svg> <strong>599</strong> stars </a> </div> <h3 class="sr-only">Watchers</h3> <div class="mt-2"> <a href="/tc39/proposal-import-attributes/watchers" data-view-component="true" class="Link Link--muted"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-eye mr-2"> <path d="M8 2c1.981 0 3.671.992 4.933 2.078 1.27 1.091 2.187 2.345 2.637 3.023a1.62 1.62 0 0 1 0 1.798c-.45.678-1.367 1.932-2.637 3.023C11.67 13.008 9.981 14 8 14c-1.981 0-3.671-.992-4.933-2.078C1.797 10.83.88 9.576.43 8.898a1.62 1.62 0 0 1 0-1.798c.45-.677 1.367-1.931 2.637-3.022C4.33 2.992 6.019 2 8 2ZM1.679 7.932a.12.12 0 0 0 0 .136c.411.622 1.241 1.75 2.366 2.717C5.176 11.758 6.527 12.5 8 12.5c1.473 0 2.825-.742 3.955-1.715 1.124-.967 1.954-2.096 2.366-2.717a.12.12 0 0 0 0-.136c-.412-.621-1.242-1.75-2.366-2.717C10.824 4.242 9.473 3.5 8 3.5c-1.473 0-2.825.742-3.955 1.715-1.124.967-1.954 2.096-2.366 2.717ZM8 10a2 2 0 1 1-.001-3.999A2 2 0 0 1 8 10Z"></path> </svg> <strong>58</strong> watching </a> </div> <h3 class="sr-only">Forks</h3> <div class="mt-2"> <a href="/tc39/proposal-import-attributes/forks" data-view-component="true" class="Link Link--muted"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-repo-forked mr-2"> <path d="M5 5.372v.878c0 .414.336.75.75.75h4.5a.75.75 0 0 0 .75-.75v-.878a2.25 2.25 0 1 1 1.5 0v.878a2.25 2.25 0 0 1-2.25 2.25h-1.5v2.128a2.251 2.251 0 1 1-1.5 0V8.5h-1.5A2.25 2.25 0 0 1 3.5 6.25v-.878a2.25 2.25 0 1 1 1.5 0ZM5 3.25a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Zm6.75.75a.75.75 0 1 0 0-1.5.75.75 0 0 0 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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> You can’t perform that action at this time. </div> <template id="site-details-dialog"> <details class="details-reset details-overlay details-overlay-dark lh-default color-fg-default hx_rsm" open> <summary role="button" aria-label="Close dialog"></summary> <details-dialog class="Box Box--overlay d-flex flex-column anim-fade-in fast hx_rsm-dialog hx_rsm-modal"> <button class="Box-btn-octicon m-0 btn-octicon position-absolute right-0 top-0" type="button" aria-label="Close dialog" data-close-dialog> <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 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