Deferred

Deferred is a simple way to create a promise that can be resolved or rejected at a later time in node-js.

Installation

npm install deferred

or

yarn add deferred

Usage

import { Deferred } from 'deferred';

function doSomethingAsync(): Promise<string> {
  const deferred = new Deferred<string>();

  setTimeout(() => {
    deferred.resolve('Hello World!');
  }, 1000);

  return deferred.promise;
}

function throwSomethingAsync(): Promise<string> {
  const deferred = new Deferred<string, Error>();

  setTimeout(() => {
    deferred.reject(new Error('Something went wrong!'));
  }, 1000);

  return deferred.promise;
}

function main() {
  doSomethingAsync()
    .then((result) => {
      console.log(result);
    })
    .catch((error) => {
      console.error(error);
    });

  throwSomethingAsync()
    .then((result) => {
      console.log(result);
    })
    .catch((error) => {
      console.error(error);
    });
}