multiple consumers of a promise

produce_consume.ts

function defer<T>(): {
  promise: Promise<T>;
  resolve: (resp: T) => void;
  reject: (err: any) => void;
} {
  const answer: any = {};
  answer.promise = new Promise((resolve, reject) => {
    answer.resolve = resolve;
    answer.reject = reject;
  });
  return answer;
}

class Producer {
    ready: Promise<number>;

    constructor() {
        const { promise, resolve, reject } = defer<number>();
        this.ready = promise;
        const num = Math.floor(1000 * Math.random());
        setTimeout(resolve, 1000, num);
    }
}

class Consumer {
    constructor(public name: string, public prod: Producer) {
        this.prod.ready.then((num: number) => {
            console.log(`${this.name} got ${num}`);
        })
    }
}

console.log('START');

const prod = new Producer();

const consumer1 = new Consumer("consumer 1", prod);
const consumer2 = new Consumer("consumer 2", prod);