Use static class methods in ES6 to perform lightweight dependency injection / IOC

injector.js

class Injector {

  static register(key) {
    this.Components = this.Components || {};
    this.Components[key] = key;
    console.log(this.Components);
  }

  passthru(key) {
    Injector.register(key);
  }
}

Injector.register('foo');

const inst = new Injector();
inst.passthru('bar');