Dep in Angular

dep-manager.ts

import { NgModule } from '@angular/core';
import 'reflect-metadata';

export class DepManager {
  static requiredProps = ['declarations', 'imports'];
  static setDeps(component: Object, deps: NgModule): void {
    Reflect.defineMetadata('deps', deps, component);
  }

  static getDeps(component: Object): NgModule {
    let deps = Reflect.getMetadata('deps', component);
    deps = deps || {};
    for (const prop of DepManager.requiredProps) {
      if (!deps.hasOwnProperty(prop)) {
        deps[prop] = new Array();
      }
    }
    return deps;
  }
}