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class="section-content"><div class="section-inner sectionLayout--insetColumn"><figure name="2430" id="2430" class="graf graf--figure graf--layoutConstrainedHeightPreview graf--leading"><div class="aspectRatioPlaceholder is-locked" style="max-width: 450.63829787234044px; max-height: 240px;"><div class="aspectRatioPlaceholder-fill" style="padding-bottom: 53.300000000000004%;"></div><img class="graf-image" data-image-id="1*dpF4Tf97ukK5wCUCeDbCbg.png" data-width="706" data-height="376" src="https://cdn-images-1.medium.com/max/901/1*dpF4Tf97ukK5wCUCeDbCbg.png"></div></figure><h3 name="2060" id="2060" class="graf graf--h3 graf-after--figure graf--title">Announcing User Defined Type Guards in Flow</h3><p name="49d2" id="49d2" class="graf graf--p graf-after--h3 graf--trailing">Flow now lets you define a function that encodes a type predicate over its…</p></div></div></section></a></div><div class="postArticle-readMore"><a class="button button--smaller button--chromeless 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Medium" aria-label="Latest stories published on Flow – Medium" data-action="open-post" data-action-source="---------3" data-action-value="https://medium.com/flow-type/announcing-conditional-types-765b421f3a87?source=---------3" data-action-index="3" data-post-id="765b421f3a87"><section class="section section--body section--first section--last"><div class="section-divider"><hr class="section-divider"></div><div class="section-content"><div class="section-inner sectionLayout--insetColumn"><figure name="5af1" id="5af1" class="graf graf--figure graf--layoutConstrainedHeightPreview graf--leading"><div class="aspectRatioPlaceholder is-locked" style="max-width: 548px; max-height: 214px;"><div class="aspectRatioPlaceholder-fill" style="padding-bottom: 39.1%;"></div><img class="graf-image" data-image-id="1*kX5EhkWiLPiwmF3SSFTYKw.png" data-width="548" data-height="214" src="https://cdn-images-1.medium.com/max/1200/1*kX5EhkWiLPiwmF3SSFTYKw.png"></div></figure><h3 name="3ea4" id="3ea4" class="graf graf--h3 graf-after--figure graf--title">Announcing Conditional Types</h3><p name="1f91" id="1f91" class="graf graf--p graf-after--h3 graf--trailing"><span class="markup--anchor markup--p-anchor" data-action="open-inner-link" data-action-value="https://flow.org/en/docs/types/conditional/">Conditional types</span> allow you to choose between two different output types by inspecting an input type. The…</p></div></div></section></a></div><div class="postArticle-readMore"><a class="button button--smaller button--chromeless u-baseColor--buttonNormal" href="https://medium.com/flow-type/announcing-conditional-types-765b421f3a87?source=---------3" data-action="open-post" data-action-source="---------3" data-action-value="https://medium.com/flow-type/announcing-conditional-types-765b421f3a87?source=---------3" data-post-id="765b421f3a87">Read more…</a></div><div class="u-clearfix u-paddingTop10"><div class="u-floatLeft"><div class="multirecommend js-actionMultirecommend u-flexCenter" data-post-id="765b421f3a87" data-is-flush-left="true" data-source="listing-----765b421f3a87---------------------clap_preview"><div class="u-relative u-foreground"><button class="button button--primary button--chromeless u-accentColor--buttonNormal button--withIcon button--withSvgIcon clapButton js-actionMultirecommendButton clapButton--darker" data-action="sign-up-prompt" data-sign-in-action="multivote" 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2024</time></a><span class="middotDivider u-fontSize12"></span><span class="readingTime" title="2 min read"></span></div></div></div></div></div><div class="postArticle-content"><a href="https://medium.com/flow-type/new-type-casting-syntax-for-flow-as-3ef41567ff3e?source=---------4" title="Latest stories published on Flow – Medium" aria-label="Latest stories published on Flow – Medium" data-action="open-post" data-action-source="---------4" data-action-value="https://medium.com/flow-type/new-type-casting-syntax-for-flow-as-3ef41567ff3e?source=---------4" data-action-index="4" data-post-id="3ef41567ff3e"><section class="section section--body section--first section--last"><div class="section-divider"><hr class="section-divider"></div><div class="section-content"><div class="section-inner sectionLayout--insetColumn"><figure name="95fe" id="95fe" class="graf graf--figure graf--layoutConstrainedHeightPreview graf--leading"><div class="aspectRatioPlaceholder is-locked" style="max-width: 322.5px; max-height: 240px;"><div class="aspectRatioPlaceholder-fill" style="padding-bottom: 74.4%;"></div><img class="graf-image" data-image-id="1*Qz7Vz1kppEptexmWxwn8ww.png" data-width="344" data-height="256" src="https://cdn-images-1.medium.com/max/645/1*Qz7Vz1kppEptexmWxwn8ww.png"></div></figure><h3 name="0239" id="0239" class="graf graf--h3 graf-after--figure graf--title">New type casting syntax for Flow: “as”</h3><p name="5b06" id="5b06" class="graf graf--p graf-after--h3 graf--trailing">To make it easier for new users to get started with <span class="markup--anchor markup--p-anchor" data-action="open-inner-link" data-action-value="https://flow.org/en/docs/">Flow</span>, we’re updating our type casting…</p></div></div></section></a></div><div class="postArticle-readMore"><a class="button button--smaller button--chromeless u-baseColor--buttonNormal" href="https://medium.com/flow-type/new-type-casting-syntax-for-flow-as-3ef41567ff3e?source=---------4" data-action="open-post" 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href="https://medium.com/flow-type/improved-flow-docs-and-try-flow-5da5e4831b5e?source=---------5" title="Latest stories published on Flow – Medium" aria-label="Latest stories published on Flow – Medium" data-action="open-post" data-action-source="---------5" data-action-value="https://medium.com/flow-type/improved-flow-docs-and-try-flow-5da5e4831b5e?source=---------5" data-action-index="5" data-post-id="5da5e4831b5e"><section class="section section--body section--first section--last"><div class="section-divider"><hr class="section-divider"></div><div class="section-content"><div class="section-inner sectionLayout--insetColumn"><figure name="previewImage" id="previewImage" class="graf graf--figure graf--layoutCroppedHeightPreview graf--leading"><div class="aspectRatioPlaceholder is-locked"><div class="aspectRatioPlaceholder-fill" style="padding-bottom: 30%;"></div><img class="graf-image" data-image-id="0*-FY6CARAa-bToGpo" data-width="1600" data-height="868" data-is-featured="true" src="https://cdn-images-1.medium.com/fit/t/1600/480/0*-FY6CARAa-bToGpo"></div></figure><h3 name="4082" id="4082" class="graf graf--h3 graf-after--figure graf--title">Improved Flow Docs and Try Flow</h3><p name="ed19" id="ed19" class="graf graf--p graf-after--h3 graf--trailing">We’ve refreshed our <span class="markup--anchor markup--p-anchor" data-action="open-inner-link" data-action-value="https://flow.org/en/docs/">documentation</span>, and added the ability to configure options and lints in <span class="markup--anchor markup--p-anchor" data-action="open-inner-link" data-action-value="https://flow.org/try/">Try Flow</span>!</p></div></div></section></a></div><div class="postArticle-readMore"><a class="button button--smaller button--chromeless u-baseColor--buttonNormal" href="https://medium.com/flow-type/improved-flow-docs-and-try-flow-5da5e4831b5e?source=---------5" data-action="open-post" data-action-source="---------5" 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stories published on Flow – Medium" aria-label="Latest stories published on Flow – Medium" data-action="open-post" data-action-source="---------6" data-action-value="https://medium.com/flow-type/announcing-5-new-flow-tuple-type-features-ff4d7f11c50a?source=---------6" data-action-index="6" data-post-id="ff4d7f11c50a"><section class="section section--body section--first section--last"><div class="section-divider"><hr class="section-divider"></div><div class="section-content"><div class="section-inner sectionLayout--insetColumn"><h3 name="previewTitle" id="previewTitle" class="graf graf--h3 graf--leading graf--title">Announcing 5 new Flow tuple type features</h3><h4 name="previewSubtitle" id="previewSubtitle" class="graf graf--h4 graf-after--h3 graf--subtitle">Labeled tuple elements, read-only tuples, optional tuple elements, tuple spread, and more.</h4><p name="previewSnippet0" id="previewSnippet0" class="graf graf--p graf-after--h4 graf--trailing">Tuples are a lighter weight alternative to objects when you want to group data…</p></div></div></section></a></div><div class="postArticle-readMore"><a class="button button--smaller button--chromeless u-baseColor--buttonNormal" href="https://medium.com/flow-type/announcing-5-new-flow-tuple-type-features-ff4d7f11c50a?source=---------6" data-action="open-post" data-action-source="---------6" data-action-value="https://medium.com/flow-type/announcing-5-new-flow-tuple-type-features-ff4d7f11c50a?source=---------6" data-post-id="ff4d7f11c50a">Read more…</a></div><div class="u-clearfix u-paddingTop10"><div class="u-floatLeft"><div class="multirecommend js-actionMultirecommend u-flexCenter" data-post-id="ff4d7f11c50a" data-is-flush-left="true" data-source="listing-----ff4d7f11c50a---------------------clap_preview"><div class="u-relative u-foreground"><button class="button button--primary button--chromeless u-accentColor--buttonNormal button--withIcon button--withSvgIcon clapButton js-actionMultirecommendButton 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0 010 1H19v2.5a.5.5 0 11-1 0V6h-2.5a.5.5 0 010-1H18V2.5z" fill="#292929"/><path d="M7 7a1 1 0 011-1h3.5a.5.5 0 000-1H8a2 2 0 00-2 2v14a.5.5 0 00.805.396L12.5 17l5.695 4.396A.5.5 0 0019 21v-8.5a.5.5 0 00-1 0v7.485l-5.195-4.012a.5.5 0 00-.61 0L7 19.985V7z" fill="#292929"/></svg></span></span></button></div></div></div></div><div class="u-paddingTop20 u-paddingBottom25 u-borderBottomLight js-block"><div class="postArticle postArticle--short js-postArticle js-trackPostPresentation" data-post-id="b49341256640" data-source="---------7"><div class="u-clearfix u-marginBottom15 u-paddingTop5"><div class="postMetaInline u-floatLeft u-sm-maxWidthFullWidth"><div class="u-flexCenter"><div class="postMetaInline-avatar u-flex0"><a class="link u-baseColor--link avatar" href="https://medium.com/@darichey" data-action="show-user-card" data-action-value="5fee5a0ae64" data-action-type="hover" data-user-id="5fee5a0ae64" dir="auto"><img 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js-postMetaInlineSupplemental"><a class="link link--darken" href="https://medium.com/flow-type/flow-can-now-detect-unused-promises-b49341256640?source=---------7" data-action="open-post" data-action-value="https://medium.com/flow-type/flow-can-now-detect-unused-promises-b49341256640?source=---------7" data-action-source="preview-listing" ><time datetime="2023-04-10T21:22:01.990Z">Apr 10, 2023</time></a><span class="middotDivider u-fontSize12"></span><span class="readingTime" title="2 min read"></span></div></div></div></div></div><div class="postArticle-content"><a href="https://medium.com/flow-type/flow-can-now-detect-unused-promises-b49341256640?source=---------7" title="Latest stories published on Flow – Medium" aria-label="Latest stories published on Flow – Medium" data-action="open-post" data-action-source="---------7" data-action-value="https://medium.com/flow-type/flow-can-now-detect-unused-promises-b49341256640?source=---------7" data-action-index="7" data-post-id="b49341256640"><section class="section section--body section--first section--last"><div class="section-divider"><hr class="section-divider"></div><div class="section-content"><div class="section-inner sectionLayout--insetColumn"><h3 name="f0ad" id="f0ad" class="graf graf--h3 graf--leading graf--title">Flow can now detect unused Promises</h3><p name="7061" id="7061" class="graf graf--p graf-after--h3 graf--trailing">As of v0.201.0, Flow can now lint against unused/floating Promises. Unused promises can be dangerous, because errors are potentially unhandled, and the code may not execute in the intended order. They are usually mistakes that Flow is perfectly positioned to warn you…</p></div></div></section></a></div><div class="postArticle-readMore"><a class="button button--smaller button--chromeless u-baseColor--buttonNormal" href="https://medium.com/flow-type/flow-can-now-detect-unused-promises-b49341256640?source=---------7" data-action="open-post" data-action-source="---------7" data-action-value="https://medium.com/flow-type/flow-can-now-detect-unused-promises-b49341256640?source=---------7" data-post-id="b49341256640">Read more…</a></div><div class="u-clearfix u-paddingTop10"><div class="u-floatLeft"><div class="multirecommend js-actionMultirecommend u-flexCenter" data-post-id="b49341256640" data-is-flush-left="true" data-source="listing-----b49341256640---------------------clap_preview"><div class="u-relative u-foreground"><button class="button button--primary button--chromeless u-accentColor--buttonNormal button--withIcon button--withSvgIcon clapButton js-actionMultirecommendButton 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class="section-divider"><hr class="section-divider"></div><div class="section-content"><div class="section-inner sectionLayout--insetColumn"><figure name="previewImage" id="previewImage" class="graf graf--figure graf--layoutCroppedHeightPreview graf--leading"><div class="aspectRatioPlaceholder is-locked"><div class="aspectRatioPlaceholder-fill" style="padding-bottom: 30%;"></div><img class="graf-image" data-image-id="1*iAWZHLO6O7pSAxP079bUcg.png" data-width="1280" data-height="720" data-is-featured="true" src="https://cdn-images-1.medium.com/fit/t/1600/480/1*iAWZHLO6O7pSAxP079bUcg.png"></div></figure><h3 name="b12c" id="b12c" class="graf graf--h3 graf-after--figure graf--trailing graf--title">Announcing Partial & Required Flow utility types + catch annotations</h3></div></div></section></a></div><div class="postArticle-readMore"><a class="button button--smaller button--chromeless u-baseColor--buttonNormal" 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data-action="show-user-card" data-action-source="---------9" data-action-value="95a4c0399e1f" data-action-type="hover" data-user-id="95a4c0399e1f" dir="auto">George Zahariev</a> in <a class="ds-link ds-link--styleSubtle link--darken link--accent u-accentColor--textNormal" href="https://medium.com/flow-type?source=---------9" data-action="show-collection-card" data-action-source="---------9" data-action-value="flow-type" data-action-type="hover">Flow</a><div class="ui-caption u-fontSize12 u-baseColor--textNormal u-textColorNormal js-postMetaInlineSupplemental"><a class="link link--darken" href="https://medium.com/flow-type/exact-object-types-by-default-by-default-cc559af6f69?source=---------9" data-action="open-post" data-action-value="https://medium.com/flow-type/exact-object-types-by-default-by-default-cc559af6f69?source=---------9" data-action-source="preview-listing" ><time datetime="2023-02-16T18:07:09.644Z">Feb 16, 2023</time></a><span class="middotDivider u-fontSize12"></span><span class="readingTime" title="2 min read"></span></div></div></div></div></div><div class="postArticle-content"><a href="https://medium.com/flow-type/exact-object-types-by-default-by-default-cc559af6f69?source=---------9" title="Latest stories published on Flow – Medium" aria-label="Latest stories published on Flow – Medium" data-action="open-post" data-action-source="---------9" data-action-value="https://medium.com/flow-type/exact-object-types-by-default-by-default-cc559af6f69?source=---------9" data-action-index="9" data-post-id="cc559af6f69"><section class="section section--body section--first section--last"><div class="section-divider"><hr class="section-divider"></div><div class="section-content"><div class="section-inner sectionLayout--insetColumn"><h3 name="f249" id="f249" class="graf graf--h3 graf--leading graf--title">Exact object types by default, by default</h3><p name="3b52" id="3b52" class="graf graf--p graf-after--h3 graf--trailing">We <span class="markup--anchor markup--p-anchor" data-action="open-inner-link" data-action-value="https://medium.com/flow-type/on-the-roadmap-exact-objects-by-default-16b72933c5cf">announced 5 years ago</span> a plan to eventually make <span class="markup--anchor markup--p-anchor" data-action="open-inner-link" data-action-value="https://flow.org/en/docs/types/objects/#toc-exact-object-types">exact object types</span> the <span class="markup--anchor markup--p-anchor" data-action="open-inner-link" data-action-value="https://flow.org/en/docs/config/options/#toc-exact-by-default-boolean">default</span>. We are now proceeding with this plan. Starting with Flow 0.200, you must explicitly set either <code class="markup--code markup--p-code">exact_by_default=true</code> or <code class="markup--code markup--p-code">exact_by_default=false</code> in the <code class="markup--code markup--p-code">[options]</code> section of…</p></div></div></section></a></div><div class="postArticle-readMore"><a class="button button--smaller button--chromeless u-baseColor--buttonNormal" href="https://medium.com/flow-type/exact-object-types-by-default-by-default-cc559af6f69?source=---------9" data-action="open-post" data-action-source="---------9" data-action-value="https://medium.com/flow-type/exact-object-types-by-default-by-default-cc559af6f69?source=---------9" data-post-id="cc559af6f69">Read more…</a></div><div class="u-clearfix u-paddingTop10"><div class="u-floatLeft"><div class="multirecommend js-actionMultirecommend u-flexCenter" data-post-id="cc559af6f69" data-is-flush-left="true" 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link--darken u-accentColor--textDarken u-baseColor--link" href="https://medium.com/flow-type/about">About</a></span></div></div></header><div class="u-tableCell"><a class="link u-baseColor--link avatar avatar--roundedRectangle" href="https://medium.com/flow-type" title="Go to Flow" aria-label="Go to Flow"><img src="https://cdn-images-1.medium.com/fit/c/72/72/1*mlCLV-3rGy-pLbUsMYEGoA.png" class="avatar-image u-size36x36 u-xs-size32x32" alt="Flow"></a></div><div class="u-tableCell u-verticalAlignMiddle u-textColorNormal u-fontSize16 u-breakWord u-paddingLeft10">Flow</div><div class="u-fontSize14 u-lineHeightBaseSans u-textColorDark u-paddingTop15 u-paddingBottom15"><div class="u-marginBottom15 u-breakWord">The official publication for the Flow static type checker for JavaScript. Code faster. Code smarter. Code confidently.</div><a class=" link--darken u-accentColor--textDarken link--accent u-accentColor--textNormal" href="https://medium.com/flow-type/about">More information</a></div><div class="u-fontSize14 u-lineHeightBaseSans u-textColorDark u-paddingBottom15"><header class="heading heading--allCaps heading--light" ><div class="u-clearfix"><div class="heading-content u-floatLeft"><span class="heading-title">Followers</span></div></div></header>1.5K </div><div class="u-fontSize14 u-lineHeightBaseSans u-marginBottom4 u-paddingBottom15"><header class="heading heading--allCaps heading--light" ><div class="u-clearfix"><div class="heading-content u-floatLeft"><span class="heading-title">Elsewhere</span></div></div></header><div class="linkSet"><a class="button button--dark button--chromeless is-touchIconBlackPulse u-baseColor--buttonDark button--withIcon button--withSvgIcon button--dark button--chromeless" href="https://twitter.com/flowtype" title="X profile" aria-label="X profile" 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