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Angular CLI: multiple apps in the same project

You may need to have an Angular project that has multiple apps so you can run the build of a particular app, say depending on the customer you’re preparing the build for. In my case, I wanted to create a project with multiple apps that I use in my Angular workshops. Having a single project with multiple apps allows you to run a time-consuming npm or yarn install once, and just modify the name of the app you want to run.

For example, you may have multiple versions of the main bootstrap file that load different root modules. The file .angular-cli.json has the apps section with the property main, and before to run a particular app, I’d instruct the students to modify .angular-cli.json to point at a particular app, e.g. "main": "main1.ts". To run another app, I’d instruct them to change this line to "main": "main2.ts".

But then I figured out that you can configure multiple apps in the same .angular-cli.json and run the build for a particular app by name. The apps property is an array, and you just need to configure each app there. For example, the following fragment shows how I configured two applications – app1 and app2 in the same .angular-cli.json:

"apps": [
    { "name":"app1",
      "root": "src",
      "outDir": "dist",
      "assets": [
        "assets",
        "favicon.ico"
      ],
      "index": "index.html",
      "main": "main-resolver.ts",
      "polyfills": "polyfills.ts",
      "test": "test.ts",
      "tsconfig": "tsconfig.app.json",
      "testTsconfig": "tsconfig.spec.json",
      "prefix": "app",
      "styles": [
        "styles.css",
       "..[email protected]/material/core/theming/prebuilt/indigo-pink.css"
      ],
      "scripts": [],
      "environmentSource": "environments/environment.ts",
      "environments": {
        "dev": "environments/environment.ts",
        "prod": "environments/environment.prod.ts"
      }
    },
    { "name":"app2",
      "root": "src",
      "outDir": "dist",
      "assets": [
        "assets",
        "favicon.ico"
      ],
      "index": "index.html",
      "main": "main-luxury.ts",
      "polyfills": "polyfills.ts",
      "test": "test.ts",
      "tsconfig": "tsconfig.app.json",
      "testTsconfig": "tsconfig.spec.json",
      "prefix": "app",
      "styles": [
        "styles.css",
      "scripts": [],
      "environmentSource": "environments/environment.ts",
      "environments": {
        "dev": "environments/environment.ts",
        "prod": "environments/environment.prod.ts"
      }
    }
  ],

Now to bootstrap the app main-resolver.ts I run the following command:

ng serve --app app1

To bootstrap the main-luxury.ts, I run this:

ng serve --app app2

You can also refer to each app by its index in the apps array:

ng serve --app 0
or
ng serve --app 1

The option –app is available for the ng build command as well. This is a pretty useful Angular CLI feature and I wanted to share my findings with you.


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More Stories By Yakov Fain

Yakov Fain is a Java Champion and a co-founder of the IT consultancy Farata Systems and the product company SuranceBay. He wrote a thousand blogs (http://yakovfain.com) and several books about software development. Yakov authored and co-authored such books as "Angular 2 Development with TypeScript", "Java 24-Hour Trainer", and "Enterprise Web Development". His Twitter tag is @yfain

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