Tips for setting default values on Angular environments

Question

Tips for setting default values on Angular environments

For my Angular application, I have multiple environment files:

environment.ts
environment.dev.ts
environment.prod.ts

Instead of duplicating default variables in each file, I want to have them shared across all environments. For example, if I define a variable 'homeUrl' only in environment.ts like this:

export const environment = {
  production: false,
  apiUrl: 'http://some-backend-url/',
  homeUrl: '/illustrator/directory'
};

When running the application using the dev configuration, the variables from environment.dev.ts are loaded correctly, but 'homeUrl' remains undefined as it is only specified in the environment.ts file.

Is there a way to utilize default variables shared across environments without redundancy?

angular typescript

Answer 1

Answer №1

You have the ability to bring in default variables from an external source.

default.ts:

export const defaultVars = {
  apiUrl: 'http://some-backend-url/',
  homeUrl: '/illustrator/directory'
}

within environment.ts:

import {defaultVars} from 'defaultVars'

export const environment = {
  ...defaultVars,
  production: false
}

then you can easily import these variables into all files. This way, any modifications made in defaultVars.ts will automatically be applied across all environments.

Answer 2

You have the ability to bring in default variables from an external source.

default.ts:

export const defaultVars = {
  apiUrl: 'http://some-backend-url/',
  homeUrl: '/illustrator/directory'
}

within environment.ts:

import {defaultVars} from 'defaultVars'

export const environment = {
  ...defaultVars,
  production: false
}

then you can easily import these variables into all files. This way, any modifications made in defaultVars.ts will automatically be applied across all environments.

Answer 3

Answer №2

My response enhances Oleg's answer:

1. Primary interface:

// configuration.ts
export interface Configuration {
   isProduction: boolean;
   apiEndpoint: string;
   homepageUrl: string;
   // additional necessary configuration definitions.
}

2. Fundamental environment:

// environment.base.ts
export const fundamentalEnvironment = {
  apiEndpoint: 'http://example-backend-url/',
  homepageUrl: '/designer/directory'
  // include more basic, default, shared configuration definitions.
}

3. Deployment environment:

// environment.prod.ts
export const environment: Configuration = {
    ...fundamentalEnvironment,
  isProduction: true,
}

4. Testing environment:

// environment.dev.ts
export const environment: Configuration = {
    ...fundamentalEnvironment,
  isProduction: false,
}

Answer 4

My response enhances Oleg's answer:

1. Primary interface:

// configuration.ts
export interface Configuration {
   isProduction: boolean;
   apiEndpoint: string;
   homepageUrl: string;
   // additional necessary configuration definitions.
}

2. Fundamental environment:

// environment.base.ts
export const fundamentalEnvironment = {
  apiEndpoint: 'http://example-backend-url/',
  homepageUrl: '/designer/directory'
  // include more basic, default, shared configuration definitions.
}

3. Deployment environment:

// environment.prod.ts
export const environment: Configuration = {
    ...fundamentalEnvironment,
  isProduction: true,
}

4. Testing environment:

// environment.dev.ts
export const environment: Configuration = {
    ...fundamentalEnvironment,
  isProduction: false,
}

Answer 5

Answer №3

Instead of just using object spreading/assignment for environment configurations, you have the option to define them as classes that inherit from a 'base' class.

// environment.ts
export class environment {
  static value = 'DefaultValue';
  static homeUrl = 'DefaultUrl';
}

Then, in your other environment configurations...

// environment.dev.ts, environment.prod.ts...
import { environment as EnvironmentBase } from './environment';

export class environment extends EnvironmentBase {
  static newThing = '??';
  static homeUrl = 'NewUrl'; // overridden
}

It's important to note that these configurations are now classes instead of object literals, so their properties should be static for proper access. Additionally, you may need to import the base configuration with a different name to avoid conflicts, or create a separate base class altogether.

Answer 6

Instead of just using object spreading/assignment for environment configurations, you have the option to define them as classes that inherit from a 'base' class.

// environment.ts
export class environment {
  static value = 'DefaultValue';
  static homeUrl = 'DefaultUrl';
}

Then, in your other environment configurations...

// environment.dev.ts, environment.prod.ts...
import { environment as EnvironmentBase } from './environment';

export class environment extends EnvironmentBase {
  static newThing = '??';
  static homeUrl = 'NewUrl'; // overridden
}

It's important to note that these configurations are now classes instead of object literals, so their properties should be static for proper access. Additionally, you may need to import the base configuration with a different name to avoid conflicts, or create a separate base class altogether.

Answer 7

Answer №4

Here is a neat approach I came up with and wanted to share:

Essentially, I'm establishing an Interface and a class to manage my default values

//config.model.ts

interface IConfig {
  mode?: string;
  setting?: boolean;
  category: string;
}

export class Config {

  constructor(setting: IConfig) {
    return Object.assign(this, setting);
  }

  // default values
  mode = 'basic';
  setting = true;
  
  // readonly values
  readonly apiKey = 'api_key';
}

Now, in your configuration file, you can implement this as follows:

export const config = new Config({
  mode: 'advanced',
  category: "local",
});

Benefits include:

You can specify required fields in all your configuration files (e.g., category)
There are default values available for certain fields, which are not mandatory (e.g., mode, setting)
You also have read-only fields that cannot be modified and remain consistent across all configurations (e.g., apiKey)

Answer 8

Here is a neat approach I came up with and wanted to share:

Essentially, I'm establishing an Interface and a class to manage my default values

//config.model.ts

interface IConfig {
  mode?: string;
  setting?: boolean;
  category: string;
}

export class Config {

  constructor(setting: IConfig) {
    return Object.assign(this, setting);
  }

  // default values
  mode = 'basic';
  setting = true;
  
  // readonly values
  readonly apiKey = 'api_key';
}

Now, in your configuration file, you can implement this as follows:

export const config = new Config({
  mode: 'advanced',
  category: "local",
});

Benefits include:

You can specify required fields in all your configuration files (e.g., category)
There are default values available for certain fields, which are not mandatory (e.g., mode, setting)
You also have read-only fields that cannot be modified and remain consistent across all configurations (e.g., apiKey)

Tips for setting default values on Angular environments

Answer №1

Answer №2

Answer №3

Answer №4

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