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docs/next/fast-refresh.html
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<ul>
<li>Fast Refresh preserves React local state in function components (and Hooks) by default.</li>
<li>Sometimes you might want to <em>force</em> the state to be reset, and a component to be remounted. For example, this can be handy if you're tweaking an animation that only happens on mount. To do this, you can add <code>// @refresh reset</code> anywhere in the file you're editing. This directive is local to the file, and instructs Fast Refresh to remount components defined in that file on every edit.</li>
<li>You can put <code>console.log</code> or <code>debugger;</code> into the components you edit during a Fast Refresh session.</li>
</ul>
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/react-native/docs/next/running-on-device"><span class="arrow-prev">← </span><span>Running On Device</span></a><a class="docs-next button" href="/react-native/docs/next/debugging"><span>Debugging</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#how-it-works">How It Works</a></li><li><a href="#error-resilience">Error Resilience</a></li><li><a href="#limitations">Limitations</a></li><li><a href="#tips">Tips</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><div><h5>Docs</h5><a href="/react-native/docs/getting-started.html">Getting Started</a><a href="/react-native/docs/tutorial.html">Tutorial</a><a href="/react-native/docs/components-and-apis.html">Components and APIs</a><a href="/react-native/docs/more-resources.html">More Resources</a></div><div><h5>Community</h5><a href="/react-native/help.html">The React Native Community</a><a href="/react-native/showcase.html">Who&#x27;s using React Native?</a><a href="http://stackoverflow.com/questions/tagged/react-native" target="_blank">Ask Questions on Stack Overflow</a><a href="https://github.com/facebook/react-native/blob/master/CONTRIBUTING.md">Contributor Guide</a><a href="https://dev.to/t/reactnative" target="_blank">DEV Community</a></div><div><h5>More Resources</h5><a href="/react-native/blog/">Blog</a><a href="https://twitter.com/reactnative" target="_blank">Twitter</a><a href="https://github.com/facebook/react-native" target="_blank">GitHub</a><a href="http://reactjs.org" target="_blank">React</a></div></section><a href="https://code.facebook.com/projects/" target="_blank" class="fbOpenSource"><img src="/react-native/img/oss_logo.png" alt="Facebook Open Source" width="170" height="45"/></a><section class="copyright">Copyright © 2020 Facebook Inc.</section></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>window.fbAsyncInit = function() {FB.init({appId:'1677033832619985',xfbml:true,version:'v2.7'});};(function(d, s, id){var js, fjs = d.getElementsByTagName(s)[0];if (d.getElementById(id)) {return;}js = d.createElement(s); js.id = id;js.src = '//connect.facebook.net/en_US/sdk.js';fjs.parentNode.insertBefore(js, fjs);}(document, 'script','facebook-jssdk'));
<h2><a class="anchor" aria-hidden="true" id="fast-refresh-and-hooks"></a><a href="#fast-refresh-and-hooks" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Fast Refresh and Hooks</h2>
<p>When possible, Fast Refresh attempts to preserve the state of your component between edits. In particular, <code>useState</code> and <code>useRef</code> preserve their previous values as long as you don't change their arguments or the order of the Hook calls.</p>
<p>Hooks with dependencies—such as <code>useEffect</code>, <code>useMemo</code>, and <code>useCallback</code>—will <em>always</em> update during Fast Refresh. Their list of dependencies will be ignored while Fast Refresh is happening.</p>
<p>For example, when you edit <code>useMemo(() =&gt; x * 2, [x])</code> to <code>useMemo(() =&gt; x * 10, [x])</code>, it will re-run even though <code>x</code> (the dependency) has not changed. If React didn't do that, your edit wouldn't reflect on the screen!</p>
<p>Sometimes, this can lead to unexpected results. For example, even a <code>useEffect</code> with an empty array of dependencies would still re-run once during Fast Refresh. However, writing code resilient to an occasional re-running of <code>useEffect</code> is a good practice even without Fast Refresh. This makes it easier for you to later introduce new dependencies to it.</p>
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/react-native/docs/next/running-on-device"><span class="arrow-prev">← </span><span>Running On Device</span></a><a class="docs-next button" href="/react-native/docs/next/debugging"><span>Debugging</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#how-it-works">How It Works</a></li><li><a href="#error-resilience">Error Resilience</a></li><li><a href="#limitations">Limitations</a></li><li><a href="#tips">Tips</a></li><li><a href="#fast-refresh-and-hooks">Fast Refresh and Hooks</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><div><h5>Docs</h5><a href="/react-native/docs/getting-started.html">Getting Started</a><a href="/react-native/docs/tutorial.html">Tutorial</a><a href="/react-native/docs/components-and-apis.html">Components and APIs</a><a href="/react-native/docs/more-resources.html">More Resources</a></div><div><h5>Community</h5><a href="/react-native/help.html">The React Native Community</a><a href="/react-native/showcase.html">Who&#x27;s using React Native?</a><a href="http://stackoverflow.com/questions/tagged/react-native" target="_blank">Ask Questions on Stack Overflow</a><a href="https://github.com/facebook/react-native/blob/master/CONTRIBUTING.md">Contributor Guide</a><a href="https://dev.to/t/reactnative" target="_blank">DEV Community</a></div><div><h5>More Resources</h5><a href="/react-native/blog/">Blog</a><a href="https://twitter.com/reactnative" target="_blank">Twitter</a><a href="https://github.com/facebook/react-native" target="_blank">GitHub</a><a href="http://reactjs.org" target="_blank">React</a></div></section><a href="https://code.facebook.com/projects/" target="_blank" class="fbOpenSource"><img src="/react-native/img/oss_logo.png" alt="Facebook Open Source" width="170" height="45"/></a><section class="copyright">Copyright © 2020 Facebook Inc.</section></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>window.fbAsyncInit = function() {FB.init({appId:'1677033832619985',xfbml:true,version:'v2.7'});};(function(d, s, id){var js, fjs = d.getElementsByTagName(s)[0];if (d.getElementById(id)) {return;}js = d.createElement(s); js.id = id;js.src = '//connect.facebook.net/en_US/sdk.js';fjs.parentNode.insertBefore(js, fjs);}(document, 'script','facebook-jssdk'));
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docs/next/fast-refresh/index.html
+6 -2
View File
@@ -92,9 +92,13 @@
<ul>
<li>Fast Refresh preserves React local state in function components (and Hooks) by default.</li>
<li>Sometimes you might want to <em>force</em> the state to be reset, and a component to be remounted. For example, this can be handy if you're tweaking an animation that only happens on mount. To do this, you can add <code>// @refresh reset</code> anywhere in the file you're editing. This directive is local to the file, and instructs Fast Refresh to remount components defined in that file on every edit.</li>
<li>You can put <code>console.log</code> or <code>debugger;</code> into the components you edit during a Fast Refresh session.</li>
</ul>
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/react-native/docs/next/running-on-device"><span class="arrow-prev">← </span><span>Running On Device</span></a><a class="docs-next button" href="/react-native/docs/next/debugging"><span>Debugging</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#how-it-works">How It Works</a></li><li><a href="#error-resilience">Error Resilience</a></li><li><a href="#limitations">Limitations</a></li><li><a href="#tips">Tips</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><div><h5>Docs</h5><a href="/react-native/docs/getting-started.html">Getting Started</a><a href="/react-native/docs/tutorial.html">Tutorial</a><a href="/react-native/docs/components-and-apis.html">Components and APIs</a><a href="/react-native/docs/more-resources.html">More Resources</a></div><div><h5>Community</h5><a href="/react-native/help.html">The React Native Community</a><a href="/react-native/showcase.html">Who&#x27;s using React Native?</a><a href="http://stackoverflow.com/questions/tagged/react-native" target="_blank">Ask Questions on Stack Overflow</a><a href="https://github.com/facebook/react-native/blob/master/CONTRIBUTING.md">Contributor Guide</a><a href="https://dev.to/t/reactnative" target="_blank">DEV Community</a></div><div><h5>More Resources</h5><a href="/react-native/blog/">Blog</a><a href="https://twitter.com/reactnative" target="_blank">Twitter</a><a href="https://github.com/facebook/react-native" target="_blank">GitHub</a><a href="http://reactjs.org" target="_blank">React</a></div></section><a href="https://code.facebook.com/projects/" target="_blank" class="fbOpenSource"><img src="/react-native/img/oss_logo.png" alt="Facebook Open Source" width="170" height="45"/></a><section class="copyright">Copyright © 2020 Facebook Inc.</section></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>window.fbAsyncInit = function() {FB.init({appId:'1677033832619985',xfbml:true,version:'v2.7'});};(function(d, s, id){var js, fjs = d.getElementsByTagName(s)[0];if (d.getElementById(id)) {return;}js = d.createElement(s); js.id = id;js.src = '//connect.facebook.net/en_US/sdk.js';fjs.parentNode.insertBefore(js, fjs);}(document, 'script','facebook-jssdk'));
<h2><a class="anchor" aria-hidden="true" id="fast-refresh-and-hooks"></a><a href="#fast-refresh-and-hooks" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Fast Refresh and Hooks</h2>
<p>When possible, Fast Refresh attempts to preserve the state of your component between edits. In particular, <code>useState</code> and <code>useRef</code> preserve their previous values as long as you don't change their arguments or the order of the Hook calls.</p>
<p>Hooks with dependencies—such as <code>useEffect</code>, <code>useMemo</code>, and <code>useCallback</code>—will <em>always</em> update during Fast Refresh. Their list of dependencies will be ignored while Fast Refresh is happening.</p>
<p>For example, when you edit <code>useMemo(() =&gt; x * 2, [x])</code> to <code>useMemo(() =&gt; x * 10, [x])</code>, it will re-run even though <code>x</code> (the dependency) has not changed. If React didn't do that, your edit wouldn't reflect on the screen!</p>
<p>Sometimes, this can lead to unexpected results. For example, even a <code>useEffect</code> with an empty array of dependencies would still re-run once during Fast Refresh. However, writing code resilient to an occasional re-running of <code>useEffect</code> is a good practice even without Fast Refresh. This makes it easier for you to later introduce new dependencies to it.</p>
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/react-native/docs/next/running-on-device"><span class="arrow-prev">← </span><span>Running On Device</span></a><a class="docs-next button" href="/react-native/docs/next/debugging"><span>Debugging</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#how-it-works">How It Works</a></li><li><a href="#error-resilience">Error Resilience</a></li><li><a href="#limitations">Limitations</a></li><li><a href="#tips">Tips</a></li><li><a href="#fast-refresh-and-hooks">Fast Refresh and Hooks</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><div><h5>Docs</h5><a href="/react-native/docs/getting-started.html">Getting Started</a><a href="/react-native/docs/tutorial.html">Tutorial</a><a href="/react-native/docs/components-and-apis.html">Components and APIs</a><a href="/react-native/docs/more-resources.html">More Resources</a></div><div><h5>Community</h5><a href="/react-native/help.html">The React Native Community</a><a href="/react-native/showcase.html">Who&#x27;s using React Native?</a><a href="http://stackoverflow.com/questions/tagged/react-native" target="_blank">Ask Questions on Stack Overflow</a><a href="https://github.com/facebook/react-native/blob/master/CONTRIBUTING.md">Contributor Guide</a><a href="https://dev.to/t/reactnative" target="_blank">DEV Community</a></div><div><h5>More Resources</h5><a href="/react-native/blog/">Blog</a><a href="https://twitter.com/reactnative" target="_blank">Twitter</a><a href="https://github.com/facebook/react-native" target="_blank">GitHub</a><a href="http://reactjs.org" target="_blank">React</a></div></section><a href="https://code.facebook.com/projects/" target="_blank" class="fbOpenSource"><img src="/react-native/img/oss_logo.png" alt="Facebook Open Source" width="170" height="45"/></a><section class="copyright">Copyright © 2020 Facebook Inc.</section></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>window.fbAsyncInit = function() {FB.init({appId:'1677033832619985',xfbml:true,version:'v2.7'});};(function(d, s, id){var js, fjs = d.getElementsByTagName(s)[0];if (d.getElementById(id)) {return;}js = d.createElement(s); js.id = id;js.src = '//connect.facebook.net/en_US/sdk.js';fjs.parentNode.insertBefore(js, fjs);}(document, 'script','facebook-jssdk'));
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