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<div id="mula-timer" class="disabled"><table><tbody><tr><td>Load</td><td>2451ms</td></tr><tr><td>Last render</td><td>2663ms</td></tr><tr><td>Average render</td><td>2663ms</td></tr><tr><td>Renders</td><td>1</td></tr><tr><td>Re-renders</td><td>0</td></tr></tbody></table></div>
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<h1 class="post-subhead">Using React's JSX with CoffeeScript and Sublime Text</h1>
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<div class="meta"><span class="author">Lari Hoppula | </span>
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<a style="color: #205caa;" href="http://facebook.github.io/react/" title="React.js">React.js</a> has been gaining ground lately in JavaScript world, replacing many libraries traditionally used for view manipulation. It embraces one-way data flow and separation of view component’s data (props) and its internal state. For more detailed explanation of React’s strengths, <a style="color: #205caa;" href="https://www.youtube.com/watch?v=DgVS-zXgMTk">check out Pete Hunt’s excellent presentation from JSConf.Asia 2013</a> and <a style="color: #205caa;" href="http://facebook.github.io/react/docs/thinking-in-react.html">Thinking in React article</a> from React’s docs.</p>
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<a style="color: #205caa;" href="http://facebook.github.io/react/docs/jsx-in-depth.html" title="JSX">JSX</a> is XML-syntaxed markup that is embedded to React component’s render method. React JSX compiler transforms embedded JSX markup to React.DOM.* calls in compiled JavaScript. Writing JSX is easy for anyone who knows HTML and it’s certainly much easier to grasp than writing nested React.DOM.* calls manually.</p>
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<h2 id="problem-coffeescript-jsx-dont-play-well-with-each-other" style="font-weight: 300; color: #000000;">Problem: CoffeeScript + JSX don’t play well with each other</h2>
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<p style="color: #000000;">Until recently, you were forced to write your CoffeeScript React component renders by <a style="color: #205caa;" href="http://www.rigelgroupllc.com/blog/2013/11/19/using-reactjs-with-coffeescript/">shelling out to JS with backticks</a> or <a style="color: #205caa;" href="http://blog.vjeux.com/2013/javascript/react-coffeescript.html">desugaring React.DOM to create lightweight DSL</a>.</p>
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<p style="color: #000000;">Luckily for us wanting the real deal, <a style="color: #205caa;" href="https://github.com/jsdf">James Friend</a> has created <a style="color: #205caa;" href="https://github.com/jsdf/coffee-react-transform">CoffeeScript transformer for JSX</a> which allows you to write that nicely formatted JSX also in your .coffee files.</p>
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<p style="color: #000000;"><a style="color: #205caa;" href="https://github.com/jsdf/coffee-react-transform">coffee-react-transform</a> can be used through <a style="color: #205caa;" href="https://github.com/jsdf/coffee-react-transform#cli">CLI</a> or <a style="color: #205caa;" href="https://github.com/jsdf/coffee-react-transform#api">API</a>. If you want CoffeeScript executable that understands CJSX, you can use <a style="color: #205caa;" href="https://github.com/jsdf/coffee-react">coffee-react</a> from the same author.</p>
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<h2 id="requiring-cjsxified-coffee-files-in-node" style="font-weight: 300; color: #000000;">Requiring CJSXified .coffee files in node</h2>
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<p style="color: #000000;">If you want to use the vanilla coffee executable to require CJSX enhanced files, you can use <a style="color: #205caa;" href="https://github.com/SimonDegraeve/node-cjsx">node-cjsx</a> module, which transparently compiles CJSX with <a style="color: #205caa;" href="https://github.com/jsdf/coffee-react-transform">coffee-react-transform</a> before second compilation step with regular coffee binary. Just add <code>require('node-cjsx').transform()</code> to your app and you’re good to go.</p>
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<h2 id="sublime-text" style="font-weight: 300; color: #000000;">Sublime Text</h2>
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<p style="color: #000000;">If you use <a style="color: #205caa;" href="http://www.sublimetext.com/">Sublime Text</a>, there’s a way to make working with CJSX much more enjoyable.</p>
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<p style="color: #000000;">First, you can install <a style="color: #205caa;" href="https://github.com/reactjs/sublime-react">sublime-react</a> which just had <a style="color: #205caa;" href="https://github.com/reactjs/sublime-react/pull/9">CJSX support committed in</a> by <a style="color: #205caa;" href="https://github.com/tgriesser">Tim Griesser</a>. It provides syntax highlighting and <a style="color: #205caa;" href="https://github.com/reactjs/sublime-react#documentation-of-available-snippets-jsx">autocompletion snippets</a> for CJSX.</p>
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<p style="color: #000000;">Second, you can change <a style="color: #205caa;" href="https://github.com/aponxi/sublime-better-coffeescript">Better CoffeeScript</a> plugin to use previously mentioned <a style="color: #205caa;" href="https://github.com/jsdf/coffee-react">coffee-react</a> as its coffee executable. Easy way to do that is to create symbolic link from your cjsx binary (e.g. <em>~/.nvm/v0.10.28/bin/cjsx</em>) to<em>~/bin/coffee</em> and setting <em>~/bin</em> as <strong><code>"binDir"</code></strong> in <em>CoffeeScript.sublime-settings</em>. Also remember to change<strong>`“envPATH”</strong> in that same settings file to a directory containing node executable (e.g. <em>~/nvm/v0.10.28/bin</em>).</p>
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<p style="color: #000000;"><strong>NOTE:</strong> <em>Replace ~ with your home dir, so e.g. ~/bin becomes /Users/hoppula/bin, Sublime does not seem to understand ~/ in config files</em>.</p>
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<p style="color: #000000;">Now you’ll get a nice preview of compiled JavaScript when you press <code>ALT+SHIFT+D</code> while editing your component’s .coffee file.</p>
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<h3 id="cjsx-to-javascript-conversion-example" style="font-weight: 300; color: #000000;">CJSX to JavaScript conversion example</h3>
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<h5 id="coffeescript-source" style="font-weight: 300; color: #000000;">CoffeeScript source</h5>
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<div class="highlight" style="color: #000000;">
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<pre><code class="coffeescript"><span class="c1" style="font-style: italic; color: #999988;"># @cjsx React.DOM</span>
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<span class="nv" style="color: #008080;">React = </span><span class="nx">require</span> <span class="s" style="color: #dd1144;">'react'</span>
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<span class="nv" style="color: #008080;">Team = </span><span class="nx">React</span><span class="p">.</span><span class="nx">createClass</span>
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<span class="nv" style="color: #008080;">render: </span><span class="nf" style="font-weight: bold; color: #990000;">-></span>
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<span class="o" style="font-weight: bold;"><</span><span class="nx">div</span> <span class="nx">className</span><span class="o" style="font-weight: bold;">=</span><span class="s" style="color: #dd1144;">"team"</span><span class="o" style="font-weight: bold;">></span>
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<span class="o" style="font-weight: bold;"><</span><span class="nx">div</span><span class="o" style="font-weight: bold;">></span><span class="p">{</span><span class="nx">@props</span><span class="p">.</span><span class="nx">team</span><span class="p">.</span><span class="nx">name</span><span class="p">}</span><span class="o" style="font-weight: bold;"></</span><span class="nx">div</span><span class="o" style="font-weight: bold;">></span>
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<span class="o" style="font-weight: bold;"><</span><span class="nx">div</span><span class="o" style="font-weight: bold;">></span><span class="p">{</span><span class="nx">@props</span><span class="p">.</span><span class="nx">team</span><span class="p">.</span><span class="nx">city</span><span class="p">}</span><span class="o" style="font-weight: bold;"></</span><span class="nx">div</span><span class="o" style="font-weight: bold;">></span>
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<span class="o" style="font-weight: bold;"></</span><span class="nx">div</span><span class="o" style="font-weight: bold;">></span>
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<span class="nv" style="color: #008080;">module.exports = </span><span class="nx">Team</span>
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</code></pre>
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</div>
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<h5 id="compiled-javascript" style="font-weight: 300; color: #000000;">Compiled JavaScript</h5>
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<div class="highlight" style="color: #000000;">
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<pre><code class="javascript"><span class="kd" style="font-weight: bold;">var</span> <span class="nx">React</span><span class="p">,</span> <span class="nx">Team</span><span class="p">;</span>
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<span class="nx">React</span> <span class="o" style="font-weight: bold;">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1" style="color: #dd1144;">'react'</span><span class="p">);</span>
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<span class="nx">Team</span> <span class="o" style="font-weight: bold;">=</span> <span class="nx">React</span><span class="p">.</span><span class="nx">createClass</span><span class="p">({</span>
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<span class="nx">render</span><span class="o" style="font-weight: bold;">:</span> <span class="kd" style="font-weight: bold;">function</span><span class="p">()</span> <span class="p">{</span>
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<span class="k" style="font-weight: bold;">return</span> <span class="nx">React</span><span class="p">.</span><span class="nx">DOM</span><span class="p">.</span><span class="nx">div</span><span class="p">({</span>
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<span class="s2" style="color: #dd1144;">"className"</span><span class="o" style="font-weight: bold;">:</span> <span class="s2" style="color: #dd1144;">"team"</span>
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<span class="p">},</span> <span class="nx">React</span><span class="p">.</span><span class="nx">DOM</span><span class="p">.</span><span class="nx">div</span><span class="p">(</span><span class="kc" style="font-weight: bold;">null</span><span class="p">,</span> <span class="k" style="font-weight: bold;">this</span><span class="p">.</span><span class="nx">props</span><span class="p">.</span><span class="nx">team</span><span class="p">.</span><span class="nx">name</span><span class="p">),</span>
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<span class="nx">React</span><span class="p">.</span><span class="nx">DOM</span><span class="p">.</span><span class="nx">div</span><span class="p">(</span><span class="kc" style="font-weight: bold;">null</span><span class="p">,</span> <span class="k" style="font-weight: bold;">this</span><span class="p">.</span><span class="nx">props</span><span class="p">.</span><span class="nx">team</span><span class="p">.</span><span class="nx">city</span><span class="p">));</span>
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<span class="p">}</span>
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<span class="p">});</span>
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<span class="nx">module</span><span class="p">.</span><span class="nx">exports</span> <span class="o" style="font-weight: bold;">=</span> <span class="nx">Team</span><span class="p">;</span>
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</code></pre>
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</div>
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<h2 id="browserify" style="font-weight: 300; color: #000000;">Browserify</h2>
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<p style="color: #000000;"><a style="color: #205caa;" href="https://github.com/jsdf">James Friend</a> has also written <a style="color: #205caa;" href="https://github.com/jsdf/coffee-reactify">coffee-reactify</a> browserify plugin, so you can easily use that same view code when rendering on server and in browser.</p>
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<p><em>This blog post is an extended version of story that was originally published on <a href="http://lari.hoppula.com/2014/06/10/using-reacts-jsx-with-coffeescript-and-sublime-text/">my personal blog</a></em>.</p>
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