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<p>Note: this feature is available with <code>react-scripts@2.0.0</code> and higher.</p>
</blockquote>
<p>Generally, we recommend that you dont reuse the same CSS classes across different components. For example, instead of using a <code>.Button</code> CSS class in <code>&lt;AcceptButton&gt;</code> and <code>&lt;RejectButton&gt;</code> components, we recommend creating a <code>&lt;Button&gt;</code> component with its own <code>.Button</code> styles, that both <code>&lt;AcceptButton&gt;</code> and <code>&lt;RejectButton&gt;</code> can render (but <a href="https://facebook.github.io/react/docs/composition-vs-inheritance.html">not inherit</a>).</p>
<p>Following this rule often makes CSS preprocessors less useful, as features like mixins and nesting are replaced by component composition. You can, however, integrate a CSS preprocessor if you find it valuable.</p>
<p>To use Sass, first install <code>node-sass</code>:</p>
<pre><code class="hljs css language-bash">$ npm install node-sass --save
$ <span class="hljs-comment"># or</span>
$ yarn add node-sass
</code></pre>
<p>Now you can rename <code>src/App.css</code> to <code>src/App.scss</code> and update <code>src/App.js</code> to import <code>src/App.scss</code>.
This file and any other file will be automatically compiled if imported with the extension <code>.scss</code> or <code>.sass</code>.</p>
<p>To share variables between Sass files, you can use Sass imports. For example, <code>src/App.scss</code> and other component style files could include <code>@import &quot;./shared.scss&quot;;</code> with variable definitions.</p>
<p>This will allow you to do imports like</p>
<pre><code class="hljs css language-scss">@<span class="hljs-keyword">import</span> <span class="hljs-string">'styles/_colors.scss'</span>; <span class="hljs-comment">// assuming a styles directory under src/</span>
@<span class="hljs-keyword">import</span> <span class="hljs-string">'~nprogress/nprogress'</span>; <span class="hljs-comment">// importing a css file from the nprogress node module</span>
</code></pre>
<blockquote>
<p><strong>Tip:</strong> You can opt into using this feature with <a href="/create-react-app/docs/adding-a-css-modules-stylesheet">CSS modules</a> too!</p>
</blockquote>
<blockquote>
<p><strong>Note:</strong> You must prefix imports from <code>node_modules</code> with <code>~</code> as displayed above.</p>
</blockquote>
<blockquote>
<p><strong>Note:</strong> If you're using Flow, add the following to your <code>.flowconfig</code> so it'll recognize the <code>.sass</code> or <code>.scss</code> imports.</p>
<pre><code class="hljs">[options]
<span class="hljs-function"><span class="hljs-keyword">module</span>.<span class="hljs-title">file_ext</span>=</span>.sass
<span class="hljs-function"><span class="hljs-keyword">module</span>.<span class="hljs-title">file_ext</span>=</span>.scss
</code></pre>
</blockquote>
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