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Environment variables from process into Angular app

Angular already has its own environment system, which allows us to configure everything in src/environments/environment.ts, and we can create as many environments as we need. The problem is, sometimes you want to use the System Environment variables, for example, some configuration from the CI server or if the build process is running an "on-premise" server; in this case, the Angular environment system will not help.

ng-process-env will help you to retrieve values from System Environment variables (process.env[]) and update relevant environment.ts file.

Installing

Just add it into your app.

npm i ng-process-env

Run

ng g ng-process-env:process-env

For monorepo managed by NRWL, use nx command instead of ng

You will be prompted to insert relevant project name.

? Project name to update angular.json config. 
(you can skip and do it later using schematics or manually) my-app
 Project my-app will be updated
    Env File will be created at apps/my-app/src/environments

? You can set name for config to be updated or added as a new one, 'onprem' - default 

Define configuration name. It will create:

• environment.<myconfig>.ts file in your /environments folder.
• <myconfig> section in your angular.json or project.json for nrwl managed monorepo

environment.<myconfig>.ts

export const environment = {
    production: false,
    baseUrl: 'http://localhost:4200',
    envVar: {
        /**
         * Add environment variables you want to retriev from process
         * PORT:4200,
         * VAR_NAME: defaultValue
         */
    }
};

angular.json \ project.json

{
  "targets": {
    "build": {
      ...
      "configurations": {
        "myconfig": {
          "fileReplacements": [
            {
              "replace": "apps/portfolio/src/environments/environment.ts",
              "with": "apps/portfolio/src/environments/environment.myconfig.ts"
            }
          ]
        }
      }
    }
  }
}

Update myconfig section according to your needs

Collect Vars

Open a created file environment.<myconfig>.ts

Update envVar section with variables you want to be retrieved from process.env.

• Important: set default values.

export const environment = {
    production: false,
    baseUrl: 'http://localhost:4200',
    envVar: {
        myVarA: 3,
        myVarB: 'someValue'
    }
};

This part can be run during CI/CD process

To update the created environment.<myconfig>.ts file with variables from process.env.

export myVarA=4
export myVarB=otherValue
ng run my-app:collect-vars

It will change file to:

export const environment = {
    production: false,
    baseUrl: "http://localhost:4200",
    envVar: {
        myVarA: 4 as number,
        myVarB: "otherValue"
    }
};

After it, you can run a build command.