mvp-di/src/Bind.ts

A simple DI package inspired by the MVP pattern. It can inject the presentation layer in React.js/React Native applications.

export function bind<T extends Function>(target: Object, propertyKey: string, descriptor: TypedPropertyDescriptor<any>): TypedPropertyDescriptor<any> {
  if (!descriptor || (typeof descriptor.value !== 'function')) {
    throw new TypeError(`Only methods can be decorated with @bind. <${propertyKey}> is not a method!`);
  }

  return {
    configurable: true,
    get(this: T): T {
      const bound: T = descriptor.value!.bind(this);
      Object.defineProperty(this, propertyKey, {
        value: bound,
        configurable: true,
        writable: true
      });
      return bound;
    }
  };
}