Heroku Buildpack for monorepos

This buildpack is useful for monorepos that contain multiple build targets which require different buildpacks on Heroku (i.e. they are bound for different Heroku apps).

Based on the "outer" buildpack for create-react-app-buildpack.

Usage

Package configuration

If packages/client uses create-react-app-buildpack and packages/api uses heroku-buildpack-nodejs, you would create a .buildpacks files for each of these directories.

In packages/client/.buildpacks:

https://github.com/heroku/heroku-buildpack-nodejs.git
https://github.com/mars/create-react-app-inner-buildpack.git#v9.0.0
https://github.com/heroku/heroku-buildpack-static.git

(these are taken from the .buildpacks in create-react-app-buildpack)

In packages/api/.buildpacks:

https://github.com/heroku/heroku-buildpack-nodejs.git

Environment configuration (Heroku config vars)

Then, in the Heroku configuration for each app, you tell it where to look for the .buildpacks file by setting the APP_BUILD_ROOT environment variable.

So for the client app, you would add the following config var:

APP_BUILD_ROOT=packages/client

And for the api app, you would add:

APP_BUILD_ROOT=packages/api