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injection-js

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injection-js

Dependency Injection library for JavaScript and TypeScript

  • 2.4.0
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What is injection-js?

injection-js is a lightweight dependency injection library for JavaScript and TypeScript, inspired by Angular's dependency injection system. It allows developers to manage dependencies in a clean and modular way, promoting better code organization and testability.

What are injection-js's main functionalities?

Basic Dependency Injection

This example demonstrates basic dependency injection using injection-js. The `Car` class depends on the `Engine` class, and the injector resolves and provides the dependencies automatically.

const { ReflectiveInjector } = require('injection-js');

class Engine {
  start() {
    console.log('Engine started');
  }
}

class Car {
  constructor(engine) {
    this.engine = engine;
  }
  drive() {
    this.engine.start();
    console.log('Car is driving');
  }
}

const injector = ReflectiveInjector.resolveAndCreate([Engine, Car]);
const car = injector.get(Car);
car.drive();

Injection Tokens

This example shows how to use injection tokens to inject primitive values or non-class dependencies. The `ApiService` class depends on an API URL, which is provided using an injection token.

const { ReflectiveInjector, InjectionToken } = require('injection-js');

const API_URL = new InjectionToken('apiUrl');

class ApiService {
  constructor(apiUrl) {
    this.apiUrl = apiUrl;
  }
  getData() {
    console.log(`Fetching data from ${this.apiUrl}`);
  }
}

const injector = ReflectiveInjector.resolveAndCreate([
  { provide: API_URL, useValue: 'https://api.example.com' },
  { provide: ApiService, useClass: ApiService, deps: [API_URL] }
]);

const apiService = injector.get(ApiService);
apiService.getData();

Hierarchical Injectors

This example demonstrates hierarchical injectors, where a child injector can inherit dependencies from a parent injector. The `Car` class is resolved in the child injector, while the `Engine` class is resolved in the parent injector.

const { ReflectiveInjector } = require('injection-js');

class Engine {
  start() {
    console.log('Engine started');
  }
}

class Car {
  constructor(engine) {
    this.engine = engine;
  }
  drive() {
    this.engine.start();
    console.log('Car is driving');
  }
}

const parentInjector = ReflectiveInjector.resolveAndCreate([Engine]);
const childInjector = parentInjector.resolveAndCreateChild([Car]);

const car = childInjector.get(Car);
car.drive();

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Package last updated on 07 Nov 2020

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