In the last week for some reason, my Vercel Hack stopped working. The variables were not importing as expected.

In case this does not work for you, here is the webpack version. I wonder if using webpack actually slows down the build process or not? Should it be avoided? Comment if you know please. I am thinking you should avoid any external dependencies when possible, but this makes using process.env seemless.

Here are instructions with Angular Universal. I had to compile different results on Google, as I tried to simplify things that others seem to over complicate --- as usual. ( ͡° ͜ʖ ͡°)

Install Dependencies

npm i -D @angular-builders/custom-webpack
npm i -D @angular-builders/dev-server
npm i -D dotenv

Create custom-webpack.config.ts

Always use Typescript! This should be a rule for all JS developer companies. Put this in your root directory.

import { EnvironmentPlugin } from 'webpack';
import { config } from 'dotenv';

config();

module.exports = {
  plugins: [
    new EnvironmentPlugin([
      'FIREBASE_API_DEV',
      'FIREBASE_API_PROD'
    ])
  ]
}

Of course I am using a Firebase example here, as you can import it as a JSON file.

Edit Environment Files

environment.prod.ts

export const environment = {
  production: true,
  firebase: JSON.parse(process.env.FIREBASE_API_PROD as string)
};

If you are just importing a string, you don't need JSON.parse() here. Do the same for all environment version files.

Edit Angular.json

Replace projects.architect.build.builder:
From:

@angular-devkit/build-angular:browser

To:

@angular-builders/custom-webpack:browser

Replace projects.architect.serve.builder:
From:

@angular-devkit/build-angular:dev-server

To:

@angular-builders/custom-webpack:dev-server

Replace projects.architect.test.builder:
From:

@angular-devkit/build-angular:karma

To:

@angular-builders/custom-webpack:karma

Replace projects.architect.server.builder:
From:

@angular-devkit/build-angular:server

To:

@angular-builders/custom-webpack:server

Add to:
projects.architect.server.options
projects.architect.build.options
projects.architect.test.options

"customWebpackConfig": {
  "path": "./custom-webpack.config.ts"
},

Create Your .env File

Put your variables in your .env file as usual:

FIREBASE_API_DEV={"apiKey":"..." ...}
FIREBASE_API_PROD={...}

And done. Here is my repository if you need an example.

NOTE: Remember to add .env to your .gitignore file.

J