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<a href=".." >Extending the Composer</a>
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<h1 id="extending-the-composer"><a name="extending-the-composer" class="plugin-anchor" href="#extending-the-composer"><i class="fa fa-link" aria-hidden="true"></i></a>Extending the Composer</h1>
<p>The composer lies at the heart of Nylas Mail, and many improvements to the mail experience require deep integration with the composer. To enable these sort of plugins, the {DraftStore} exposes an extension API.</p>
<p>This API allows your package to:</p>
<ul>
<li><p>Display warning messages before a draft is sent. (ie: &quot;Are you sure you want to send this without attaching a file?&quot;)</p>
</li>
<li><p>Intercept keyboard and mouse events to the composer&apos;s text editor.</p>
</li>
<li><p>Transform the draft and make additional changes before it is sent.</p>
</li>
</ul>
<p>To create your own composer extensions, subclass {ComposerExtension} and override the methods your extension needs.</p>
<p>In the sample packages repository, <a href="">templates</a> is an example of a package which uses a ComposerExtension to enhance the composer experience.</p>
<h3 id="example"><a name="example" class="plugin-anchor" href="#example"><i class="fa fa-link" aria-hidden="true"></i></a>Example</h3>
<p>This extension displays a warning before sending a draft that contains the names of competitors&apos; products. If the user proceeds to send the draft containing the words, it appends a disclaimer.</p>
<pre><code class="lang-coffee">{ComposerExtension} = <span class="hljs-built_in">require</span> <span class="hljs-string">&apos;nylas-exports&apos;</span>
<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">ProductsExtension</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">ComposerExtension</span></span>
@warningsForSending: <span class="hljs-function"><span class="hljs-params">({draft})</span> -&gt;</span>
words = [<span class="hljs-string">&apos;acme&apos;</span>, <span class="hljs-string">&apos;anvil&apos;</span>, <span class="hljs-string">&apos;tunnel&apos;</span>, <span class="hljs-string">&apos;rocket&apos;</span>, <span class="hljs-string">&apos;dynamite&apos;</span>]
body = draft.body.toLowercase()
<span class="hljs-keyword">for</span> word <span class="hljs-keyword">in</span> words
<span class="hljs-keyword">if</span> body.indexOf(word) &gt; <span class="hljs-number">0</span>
<span class="hljs-keyword">return</span> [<span class="hljs-string">&quot;with the word &apos;<span class="hljs-subst">#{word}</span>&apos;?&quot;</span>]
<span class="hljs-keyword">return</span> []
@applyTransformsForSending: <span class="hljs-function"><span class="hljs-params">({draftBodyRootNode, draft})</span> -&gt;</span>
<span class="hljs-keyword">if</span> @warningsForSending({draft})
el = <span class="hljs-built_in">document</span>.createElement(<span class="hljs-string">&apos;p&apos;</span>);
el.innerText = <span class="hljs-string">&quot;This email contains competitor&apos;s product names or trademarks used in context.&quot;</span>
draftBodyRootNode.appendChild(el)
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