NPM doesn't install module dependencies when deploying a Grunt app to heroku

Question

I\'v made a static single page site using grunt. I\'m now trying to deploy it to heroku using the heroku-buildpack-nodejs-grunt for node grunt.

Below is a pic of my roo

Answer 1

The only thing I can think of is that maybe Heroku installs your devDependencies first, tries to run Grunt, but since it didn't install load-grunt-tasks yet, you don't get the grunt.loadNpmTasks( 'grunt-contrib-uglify' ); line (which load-grunt-tasks does for you), and thus Grunt can't find the package.

Can you try changing your Gruntfile to explicitly list out all npm modules using the grunt.loadNpmTasks() method?

EDIT:

Just remembered another thing I had to do:

heroku labs:enable user-env-compile -a myapp
heroku config:set NODE_ENV=production

(Obviously replacing myapp with your Heroku app name.)

This makes Heroku allow user set environment variables and then sets your server to production. Try that, and set your dependencies and devDependencies as you had them originally (just to see if it works).