Inject

@tsed/di

Usage

import { Inject } from "@tsed/di";

See /packages/di/src/common/decorators/inject.ts.

Overview

function Inject<T = any>(token?: TokenProvider<T> | (() => TokenProvider<T>), transform?: TransformInjectedProviderCB<T>): any;
export function Inject<T = any>(token?: TokenProvider<T> | (() => TokenProvider<T>), opts?: Partial<Omit<BindInjectablePropertyOpts<T>, "token">>): any;

• token (TokenProvider<T> | (() => TokenProvider<T>)): Optional. The provider token to inject ( for constructor params with TypeScript metadata)

• transform (TransformInjectedProviderCB<T>): Optional. transformation function or injection options

Description

Inject a provider into a constructor parameter or property.

Explicitly declares a dependency injection for constructor parameters or class properties. Supports custom tokens, transformations, and injection options.

Usage

import {Injectable, Inject} from "@tsed/di";

const CONNECTION = Symbol.for("CONNECTION");

@Injectable()
export class MyService {
  // Property injection
  @Inject(CONNECTION)
  connection: Database;

  // Constructor injection
  constructor(
    @Inject(CONNECTION) private db: Database,
    private otherService: OtherService // Auto-injected
  ) {}
}

// With transformation
@Injectable()
export class ProcessorService {
  @Inject(DataService, (service) => service.getData())
  initialData: any[];
}