Use node.js in a symfony2 app on Heroku

So we wanted to minify our Javascript and CSS files in our symfony 2 app.

Following the symfony's cookbook seemed pretty easy but we just did not know how to install/use node executable on Heroku.

Turns out to be fairly easy : you have to use multiple heroku buildpacks.

• If you have not done it yet add a default buildpack :
  

  heroku buildpacks:set heroku/php

• Then add the nodejs buildpack in order to be able to use uglifyjs2 :
  

  heroku buildpacks:add -i 1 heroku/nodejs

• Add a file at the root of your symfony project named package.json with the following content in it :
  

  { "engines": { "node": "4.2.3" } }

  N.B.: of course replace "4.2.3" with the node version your are using (that you can find with node -v)

• Finally follow the cookbook and you should be able to minify your files on heroku without any problems.

The command heroku buildpacks should print something like that : 

Cheers!