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    <p>npm has a support for a <code>postinstall</code> step (among many others) that might be just what you're looking for.</p> <p>The node.js heroku buildpack runs this command when you push to heroku to resolve build dependencies:</p> <pre><code>$ npm install --production </code></pre> <p><a href="https://devcenter.heroku.com/articles/nodejs-support#build-behavior" rel="noreferrer">https://devcenter.heroku.com/articles/nodejs-support#build-behavior</a></p> <p>If you take a look at the npm documentation, you can setup a series of scripts to run either before or after anyone runs <code>npm install</code> for your package. It's configured in the <code>scripts</code> property of <code>package.json</code>. The <code>scripts</code> property allows to run custom scripts (including <code>grunt</code>) when certain things happen in a package's lifecycle.</p> <p>For example, to echo some text and run the <code>grunt</code> command whenever anyone (including Heroku) runs <code>npm install</code>, add this to your <code>package.json</code>:</p> <pre><code>{ ... "scripts": { "postinstall": "echo postinstall time; ./node_modules/grunt-cli/bin/grunt &lt;your task name&gt;" }, ... } </code></pre> <p><a href="https://npmjs.org/doc/scripts.html" rel="noreferrer">https://npmjs.org/doc/scripts.html</a></p> <p>Important caveats:</p> <ul> <li>You might have to change the path to the grunt binary in the <code>postinstall</code> script, check the error output if the <code>grunt</code> command doesn't execute.</li> <li><code>grunt</code> and <code>grunt-cli</code> must be listed as a <code>dependency</code> in your <code>package.json</code> so it gets installed by Heroku. Listing them under <code>devDependencies</code> is not sufficient since Heroku won't install those. Also, note that Heroku won't install it as a global package so to execute it on Heroku you're going to have to use a relative path (as it is configured above).</li> </ul> <p>If this doesn't work (you'll probably need to fiddle with the relative paths a bit), then you might want to consider writing <a href="https://devcenter.heroku.com/articles/buildpack-api" rel="noreferrer">your own custom buildpack for Heroku</a>.</p> <h2>Update</h2> <p>As of 0.4, the <code>grunt</code> package no longer contains the <code>grunt</code> binary, which is now part of the <code>grunt-cli</code> package. The answer has been updated to reflect this.</p>
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    1. COExcellent explanation. I haven't knew that. I will read about buildpacks. It helps me as I mentioned above. But actually I haven't seen how it exactly works :)
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