Setting the desired configuration for launching an Aurelia application

After creating a new Aurelia Typescript application using the au new command from the Aurelia CLI, I noticed that there is a config directory at the root of the project. Inside this directory, there are two files: environment.json and environment.production.json. Here is how mine are configured:

environment.json

{
  "debug": true,
  "testing": true,
  "stringVal": "Hello World"
}

environment.production.json

{
  "debug": false,
  "testing": false,
  "stringVal": "Hello Production"
}

I am looking to have the ability to switch between configurations when running the application from the command line. Below are my current app.ts and app.html files:

app.ts

import environment from '../config/environment.json';
export class App {
  public message = environment.stringVal;
}

app.html

<template>
  <h1>${message}</h1>
</template>

Additionally, here is my main.ts file:

import {Aurelia} from 'aurelia-framework';
import environment from '../config/environment.json';
import {PLATFORM} from 'aurelia-pal';

export function configure(aurelia: Aurelia): void {
  aurelia.use
    .standardConfiguration()
    .feature(PLATFORM.moduleName('resources/index'));

  aurelia.use.developmentLogging(environment.debug ? 'debug' : 'warn');

  if (environment.testing) {
    aurelia.use.plugin(PLATFORM.moduleName('aurelia-testing'));
  }

  aurelia.start().then(() => aurelia.setRoot(PLATFORM.moduleName('app')));
}
  1. What code changes are needed to read stringVal from a different configuration file without hard-coding the import?
  2. Which flags should be used with au run or npm start in the command line to specify the desired configuration?

Answer №1

After reviewing your code, it seems that the issue with question #1 should already be resolved by passing the correct environment parameter to your run function. One suggestion I have is to create an environment.ts file that can manage this for you. Here's an example:

environment.ts

import env from '../config/environment.json';

function getEnvironmentValue() {
    return env.stringVal;
}

export { getEnvironmentValue }

Then in your app.ts file, you can use it like this:

import { getEnvironmentValue } from './environment';
export class App {
  public message = getEnvironmentValue();
}

Regarding question #2, it has been addressed in the comments on your post, but I'll also mention it here. You should use --env for this purpose. Below are the scripts I utilize for my Au1 Project:

    "scripts": {
        "analyze": "webpack --env production --analyze",
        "build": "webpack --env production",
        "build:dev": "webpack",
        "build:staging": "webpack --env staging",
        "start": "webpack-dev-server"
    },

I have separate files such as environment.staging.json, environment.json, and environment.production.json in my config folder, and they all function properly.

I hope this information proves helpful! Best of luck with your project.

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