by lingolive

GitHub Readme.md


A buildpack to support Heroku deployments with polymer-cli.


Heroku Dashboard

Add a custom buildpack to your to your applications Settings tab under section Buildpacks by using the URL of this repository, instead of the short name of Heroku's own buildpacks. It goes alongside your Ruby and Node buildpacks, placed in last position.

After the release of registered buildpacks, it will be available under the name lingolive/polymer-cli-buildpack, adhearing to the suggested naming conventions there.

Heroku CLI

First, check your Heroku app has the Ruby and Node buildpacks added, in the command line run:

heroku buildpacks

If they are added you should see:

your-app-1234 Buildpack
1. heroku/nodejs
2. heroku/ruby

To add the Polymer CLI Rails buildpack in the last index, run this command:

heroku buildpacks:add --index 3 https://github.com/lingolive/polymer-cli-buildpack.git


On deployment, the buildpack runs the build command polymer build or yarn build.

Package Manager

Heroku supports both NPM and Yarn as Javascript package managers. This buildpack will detect which one to use automatically, based on the persence of a version-lock file. Projects that use yarn have a yarn.lock file, while those that use npm have a package-lock.json (or none if using an older version of npm).

This buildpack will set the YARN environment variable accordingly, which will make that the effective package manager for Javascript.


  1. Fork it!
  2. Create your feature branch: git checkout -b my-new-feature
  3. Commit your changes: git commit -am 'Add some feature'
  4. Push to the branch: git push origin my-new-feature
  5. Submit a pull request :D


Forked from https://github.com/febeling/webpack-rails-buildpack on August 18, 2018.


polymer-cli-buildpack built and maintained by Lingo Live https://github.com/febeling/webpack-rails-buildpack by Florian Ebeling.


See LICENSE.md file.