Angular-cli: Logic in module file depending on environment

In Angular, you can conditionally apply logic in the module file based on the environment using the Angular CLI environment files. Angular CLI allows you to define multiple environment files (e.g., environment.prod.ts for production and environment.ts for development) and switch between them when building or serving the application.

Here's how you can conditionally apply logic in the module file based on the environment:

1. Set Up Environment Files: First, make sure you have set up your environment files correctly. By default, Angular CLI provides two environment files: environment.ts and environment.prod.ts. You can find these files in the src/environments directory of your Angular project.

   • environment.ts (Development environment):

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   export const environment = {
     production: false,
     apiBaseUrl: 'http://localhost:3000/api', // Example API URL for development
   };
   

   • environment.prod.ts (Production environment):

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   export const environment = {
     production: true,
     apiBaseUrl: 'https://api.example.com', // Example API URL for production
   };
   

2. Import Environment in the Module: In your module file (e.g., app.module.ts), import the environment object from the appropriate environment file and use it to configure your module logic.

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   import { NgModule } from '@angular/core';
   import { BrowserModule } from '@angular/platform-browser';
   import { AppComponent } from './app.component';
   
   // Import environment based on the selected environment
   import { environment } from '../environments/environment';
   
   @NgModule({
     declarations: [AppComponent],
     imports: [BrowserModule],
     providers: [],
     bootstrap: [AppComponent],
   })
   export class AppModule {
     constructor() {
       // Use environment object to apply conditional logic
       if (environment.production) {
         // Logic for production environment
         console.log('Running in production mode');
       } else {
         // Logic for development environment
         console.log('Running in development mode');
       }
   
       console.log('API Base URL:', environment.apiBaseUrl);
     }
   }
   

   In the above example, we use the environment object to check whether we are running in production mode or development mode. Depending on the environment, you can apply different configurations or logic.

3. Build and Serve the Application: When you build or serve your Angular application using the Angular CLI, specify the environment you want to use. By default, ng serve uses the environment.ts file for development, and ng build --prod uses the environment.prod.ts file for production.

   For example, to serve the application using the development environment:

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   ng serve
   

   To build the application for production:

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   ng build --prod
   

By using different environment files and importing the appropriate environment object in your module files, you can conditionally apply logic based on the environment settings. This allows you to have different configurations for development and production, such as different API URLs, logging behavior, and other environment-specific settings.