di

Dependency Registration

This feature allows you to register dependencies with the injector. In the code sample, an API key is registered as a value dependency.

const Injector = require('di');
const injector = new Injector();
injector.value('apiKey', '12345');

Dependency Resolution

This feature involves resolving and injecting dependencies into services or other components. The code sample demonstrates how to resolve a 'MyService' instance with 'apiKey' injected into it.

const Injector = require('di');
const injector = new Injector();
function MyService(apiKey) { this.apiKey = apiKey; }
injector.value('apiKey', '12345');
injector.service('myService', MyService, ['apiKey']);
const myServiceInstance = injector.get('myService');

Child Injectors

Child injectors inherit dependencies from their parent injector but can also override them. This feature is useful for creating isolated scopes.

const Injector = require('di');
const parentInjector = new Injector();
const childInjector = parentInjector.createChild();
parentInjector.value('apiKey', '12345');
childInjector.get('apiKey');