Optimizing Angular 2 TypeScript with enableProdMode for JSPM bundling.QRectPreparing Angular 2

I am in the process of developing an Angular 2 application and packaging it using SystemJS/JSPM.

During the development phase, I include the app in index.html:

<script src="jspm_packages/system.js"></script>
<script src="systemjs.config.js"></script>
<script src="systemjs.importapp.js"></script>

For bundling, I use the following command:

jspm bundle-sfx app assets/js/myapp.sfx.min.js --minify --no-mangle --skip-source-maps

I then update a version of index.html with

<script src="assets/js/myapp.sfx.min.js" defer></script>

which replaces the three scripts mentioned above.

The starting point in my main.ts file looks like this:

// CORE IMPORTS
import 'es6-shim';
import 'reflect-metadata';
import 'zone.js';
import 'zone.js/dist/zone';
import 'zone.js/dist/long-stack-trace-zone';
import 'rxjs';

// ADD ALL OPERATORS TO OBSERVABLES
import 'rxjs/Rx';

// APP INITIALISATION
import {bootstrap} from 'angular2/platform/browser';
import {enableProdMode} from 'angular2/core';
import {AppComponent} from './app.component';
import {ROUTER_PROVIDERS} from 'angular2/router';

bootstrap(AppComponent, [
  ROUTER_PROVIDERS
]);

My challenge is to conditionally call enableProdMode() only when I am bundling with jspm bundle-sfx.

What would be the most effective approach to achieve this?

Answer №1

I have discovered a solution for this issue by creating an external JSON file called environment.json in the same directory as the main entry point main.ts for my application. The content of this JSON file is as follows:

{
  'env': 'dev'
}

In the main.ts file:

import _environment from './environment.json!json';

if (_environment.env === 'dev') {
  console.log('Operating in development mode.')
}

if (_environment.env === 'prod') {
  console.log('Operating in production mode.');
  enableProdMode();
}

To make this work, you need to install the SystemJS JSON plugin:

jspm install json

After that, in my build script, I change the value of env to prod just before creating the bundle, and then switch it back to dev afterwards using jq.

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