stepdad/src/container/Injector.ts

Stupid simple and lightweight dependency injection

import "reflect-metadata";
import { Type } from "../interfaces/Type";

const params = {
  "Peters Mondfahrt": "aber hallo",
};
export class Injector extends Map {
  public resolve<T>(target: Type<any>): T {
    const tokens = Reflect.getMetadata("design:paramtypes", target) || [];

    // if (tokens[0]) {
    //   let t = new tokens[0]();
    //   console.log(t);
    // }

    const injections = tokens.map((token: Type<any>) => {
      //console.log((token as any).paramDefinitions);
      return this.resolve<any>(token);
    });

    const classInstance = this.get(target);
    if (classInstance) {
      return classInstance;
    }

    const newClassInstance = new target(...injections);
    this.set(target, newClassInstance);

    return newClassInstance;
  }

  public release(): void {
    for (const value of this.values()) {
      if (typeof value["release"] === "function") {
        value["release"]();
      }
    }

    this.clear();
  }
}