by Bernd-L

GitHub Readme.md

ExDateMan Buildpack

The purpose of this Heroku Buildpack is to write files in the deployed project before compilation.

It is designed to work with TypeScript/node.js projects. Others should work as well, but I didn't test that.


For every file to be written into the deployed project directory, the following steps must be followed:

  1. Create a Heroku config variable which name starts with WF_; the remaining part of the name doesn't matter
  2. Paste the full path of the file to be created relative to your project root into the first line (don't prepend /)
  3. Paste the content of your file into the variable (can be multi-line) into the second line (can be empty)

Note: Only use normal characters for the name of your variables:

  • A-Z
  • a-z
  • underline
  • 0-9


When using Angular, one may want to set their environment configuration files without exposing the API endpoint to the public via GitHub. This use case is present in the ExDateMan repository, and is the reason for the existence of this buildpack.

The environment.prod.ts file in PROJECT_ROOT/src/environments/ would be created by this build pack using the following Heroku config variable: WF_Angular_prod_env with the following content:

// This is a test file which should get copied to Build/src/environments/environment.prod.ts

export const environment = {
  production: true,
  baseUrl: "/",
  greeting: "Hello there!"

The first line will be omitted form the output file. It's just used to tell the buildpack where to create (or replace) the file.


  1. Add the GitHub repository URL as a buildpack to your Heroku app
  2. Move up the newly added buildpack (It should be above any buildpack that relies on the files being created)

Copyright notice

Copyright 2019 Bernd-L.

Licensed under the MIT licence (see the LICENSE file).