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<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Adding Flow · Create React App</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta name="description" content="Flow is a static type checker that helps you write code with fewer bugs. Check out this [introduction to using static types in JavaScript](https://medium.com/@preethikasireddy/why-use-static-types-in-javascript-part-1-8382da1e0adb) if you are new to this concept."/><meta name="docsearch:language" content="en"/><meta property="og:title" content="Adding Flow · Create React App"/><meta property="og:type" content="website"/><meta property="og:url" content="https://facebook.github.io/create-react-app/index.html"/><meta property="og:description" content="Flow is a static type checker that helps you write code with fewer bugs. Check out this [introduction to using static types in JavaScript](https://medium.com/@preethikasireddy/why-use-static-types-in-javascript-part-1-8382da1e0adb) if you are new to this concept."/><meta property="og:image" content="https://facebook.github.io/create-react-app/img/logo-og.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://facebook.github.io/create-react-app/img/logo-og.png"/><link rel="shortcut icon" href="/create-react-app/img/favicon/favicon.ico"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script type="text/javascript" src="https://buttons.github.io/buttons.js"></script><link rel="stylesheet" href="/create-react-app/css/main.css"/></head><body class="sideNavVisible separateOnPageNav"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a 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class="navToggle" id="navToggler"><i></i></div><h2><i>›</i><span>Building your App</span></h2><div class="tocToggler" id="tocToggler"><i class="icon-toc"></i></div></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle">Welcome</h3><ul><li class="navListItem"><a class="navItem" href="/create-react-app/docs/documentation-intro">About Docs</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Getting Started</h3><ul><li class="navListItem"><a class="navItem" href="/create-react-app/docs/getting-started">Getting Started</a></li><li class="navListItem"><a class="navItem" href="/create-react-app/docs/folder-structure">Folder Structure</a></li><li class="navListItem"><a class="navItem" href="/create-react-app/docs/available-scripts">Available Scripts</a></li><li class="navListItem"><a class="navItem" href="/create-react-app/docs/supported-browsers-features">Supported Browsers and Features</a></li><li class="navListItem"><a class="navItem" 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href="/create-react-app/docs/importing-a-component">Importing a Component</a></li><li class="navListItem"><a class="navItem" href="/create-react-app/docs/using-global-variables">Using Global Variables</a></li><li class="navListItem"><a class="navItem" href="/create-react-app/docs/adding-bootstrap">Adding Bootstrap</a></li><li class="navListItem navListItemActive"><a class="navItem" href="/create-react-app/docs/adding-flow">Adding Flow</a></li><li class="navListItem"><a class="navItem" href="/create-react-app/docs/adding-typescript">Adding TypeScript</a></li><li class="navListItem"><a class="navItem" href="/create-react-app/docs/adding-relay">Adding Relay</a></li><li class="navListItem"><a class="navItem" href="/create-react-app/docs/adding-a-router">Adding a Router</a></li><li class="navListItem"><a class="navItem" href="/create-react-app/docs/adding-custom-environment-variables">Environment Variables</a></li><li class="navListItem"><a class="navItem" href="/create-react-app/docs/making-a-progressive-web-app">Making a Progressive Web App</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Testing</h3><ul><li class="navListItem"><a class="navItem" href="/create-react-app/docs/running-tests">Running Tests</a></li><li class="navListItem"><a class="navItem" href="/create-react-app/docs/debugging-tests">Debugging Tests</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Back-End Integration</h3><ul><li class="navListItem"><a class="navItem" href="/create-react-app/docs/proxying-api-requests-in-development">Proxying in Development</a></li><li class="navListItem"><a class="navItem" href="/create-react-app/docs/fetching-data-with-ajax-requests">Fetching Data</a></li><li class="navListItem"><a class="navItem" href="/create-react-app/docs/integrating-with-an-api-backend">Integrating with an API</a></li><li class="navListItem"><a class="navItem" href="/create-react-app/docs/title-and-meta-tags">Title & Meta Tags</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Deployment</h3><ul><li class="navListItem"><a class="navItem" href="/create-react-app/docs/deployment">Deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Advanced Usage</h3><ul><li class="navListItem"><a class="navItem" href="/create-react-app/docs/can-i-use-decorators">Can I Use Decorators?</a></li><li class="navListItem"><a class="navItem" href="/create-react-app/docs/pre-rendering-into-static-html-files">Pre-Rendering Static HTML</a></li><li class="navListItem"><a class="navItem" href="/create-react-app/docs/advanced-configuration">Advanced Configuration</a></li><li class="navListItem"><a class="navItem" href="/create-react-app/docs/alternatives-to-ejecting">Alternatives to Ejecting</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Support</h3><ul><li class="navListItem"><a class="navItem" href="/create-react-app/docs/troubleshooting">Troubleshooting</a></li></ul></div></div></section></div><script>
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</script></nav></div><div class="container mainContainer docMainContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/facebook/create-react-app/edit/master/docusaurus/docs/adding-flow.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 class="postHeaderTitle">Adding Flow</h1></header><article><div><span><p>Flow is a static type checker that helps you write code with fewer bugs. Check out this <a href="https://medium.com/@preethikasireddy/why-use-static-types-in-javascript-part-1-8382da1e0adb">introduction to using static types in JavaScript</a> if you are new to this concept.</p>
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<p>Recent versions of <a href="https://flow.org/">Flow</a> work with Create React App projects out of the box.</p>
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<p>To add Flow to a Create React App project, follow these steps:</p>
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<ol>
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<li>Run <code>npm install --save flow-bin</code> (or <code>yarn add flow-bin</code>).</li>
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<li>Add <code>"flow": "flow"</code> to the <code>scripts</code> section of your <code>package.json</code>.</li>
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<li>Run <code>npm run flow init</code> (or <code>yarn flow init</code>) to create a <a href="https://flow.org/en/docs/config/"><code>.flowconfig</code> file</a> in the root directory.</li>
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<li>Add <code>// @flow</code> to any files you want to type check (for example, to <code>src/App.js</code>).</li>
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</ol>
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<p>Now you can run <code>npm run flow</code> (or <code>yarn flow</code>) to check the files for type errors.
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You can optionally use an IDE like <a href="https://nuclide.io/docs/languages/flow/">Nuclide</a> for a better integrated experience.
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In the future we plan to integrate it into Create React App even more closely.</p>
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<p>To learn more about Flow, check out <a href="https://flow.org/">its documentation</a>.</p>
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