TypeScript decorators types

tsdecorators.ts

type PropertyDecorator = (target: any, propertyKey: string | symbol) => void;

type MethodDecorator = (target: any, propertyKey: string | symbol, descriptor: TypedPropertyDescriptor) =>
    TypedPropertyDescriptor | void;

type ClassDecorator = (target: any) => any;

function ClassDecoratorImpl(...decoratorArgs: Array<any>): ClassDecorator {
  console.log('injectable works fine');
  return function(target) {
    // common code для переопределения конструктора
    const originalConstructor = target;

    function construct(constructor: any, args: Array<any>): any {
      // tslint:disable-next-line
      const c: any = function () {
        // tslint:disable-next-line
        return constructor.apply(this, args);
      };

      c.prototype = constructor.prototype;
      return new c();
    }

    // tslint:disable-next-line
    const newConstructor = function (...args) {
      console.log('Injected!');
      const newInstance = construct(originalConstructor, args);
      return newInstance;
    };

    newConstructor.prototype = originalConstructor.prototype;

    return newConstructor;
  }
}