Angular Version Display: Multiple Methods Compared (environment.ts, VERSION, and more)

1. Using environment.ts (Recommended):

   • Create an environment.ts file in your src/environments directory (if it doesn't exist).
   • Import the version from your package.json using a technique like require (for older Angular CLI versions) or import (for newer versions with --resolveJsonModule enabled in tsconfig.json).
   • Define an appVersion property in environment.ts to hold the version number.
   • In your component's TypeScript file, import environment and access environment.appVersion.
   • Display the version in your component's template using string interpolation.

   Example (environment.ts):

   import { version } from '../../package.json'; // Adjust the path if necessary
   
   export const environment = {
     production: false,
     appVersion: version
   };
   

   Example (component TypeScript):

   import { Component } from '@angular/core';
   import { environment } from 'src/environments/environment';
   
   @Component({
     selector: 'app-my-component',
     templateUrl: './my-component.component.html'
   })
   export class MyComponent {
     appVersion = environment.appVersion;
   }
   

   <p>App Version: {{ appVersion }}</p>
   

2. Using VERSION from @angular/core (Limited Information):

   • Import VERSION from @angular/core in your component.
   • Access the full property of VERSION to get the version string.

   Example:

   import { Component } from '@angular/core';
   import { VERSION } from '@angular/core';
   
   @Component({
     selector: 'app-my-component',
     templateUrl: './my-component.component.html'
   })
   export class MyComponent {
     appVersion = VERSION.full;
   }
   

   Note: This method only provides the full version string, not specific version components like major, minor, or patch.

Additional Considerations:

• Ionic Framework: If you're using Ionic, the approach remains similar. Create an environment variable or use VERSION from @angular/core within your Ionic component.
• Automatic Version Updates: Consider using a version management tool like semantic-release to automate version updates during build processes.

Example Codes for Displaying App Version in Angular

environment.ts:

// src/environments/environment.ts
import { version } from '../../package.json'; // Adjust the path if necessary

export const environment = {
  production: false,
  appVersion: version
};

Component (TypeScript):

// src/app/my-component/my-component.component.ts
import { Component } from '@angular/core';
import { environment } from 'src/environments/environment';

@Component({
  selector: 'app-my-component',
  templateUrl: './my-component.component.html'
})
export class MyComponent {
  appVersion = environment.appVersion;
}

Component (Template):

<p>App Version: {{ appVersion }}</p>

Explanation:

1. • Imports the version from package.json. Adjust the path if your package.json is located differently.
   • Defines environment with production and appVersion properties. appVersion holds the version number from package.json.
2. • Imports Component from @angular/core and environment from your environment.ts file.
   • Defines the MyComponent class with a selector and template URL.
   • In the class, sets appVersion to the value of environment.appVersion.

import { Component } from '@angular/core';
import { VERSION } from '@angular/core';

@Component({
  selector: 'app-my-component',
  templateUrl: './my-component.component.html'
})
export class MyComponent {
  appVersion = VERSION.full;
}

<p>App Version: {{ appVersion }}</p>

Inline Script (Not Recommended):

This method is generally not recommended as it tightly couples the version information with the component template, making maintenance less flexible.

<p>App Version: {{ (typeof window !== 'undefined' && window['appVersion']) || 'N/A' }}</p>

1. VERSION from @angular/core:

2. • This approach checks if window object exists (indicating a browser environment).
   • If it does, it tries to access a hypothetical appVersion property on window. This property might not be universally available and could be unreliable.
   • If window.appVersion is not found, it displays "N/A".

Important Notes:

• The VERSION from @angular/core approach only provides limited information (full version string).
• The inline script method is not recommended due to tight coupling and potential unreliability.