is-promise

What is is-promise?

The is-promise npm package is a simple utility that checks if a given object is a promise. It is useful for ensuring that a value conforms to the Promise interface, which is essential in asynchronous programming.

What are is-promise's main functionalities?

Check if a value is a promise

This feature allows you to check if a given value is a promise. The function returns true if the value is a promise and false otherwise.

const isPromise = require('is-promise');

const promise = new Promise((resolve, reject) => {});
const notPromise = {};

console.log(isPromise(promise)); // true
console.log(isPromise(notPromise)); // false

Other packages similar to is-promise

p-is-promise

The p-is-promise package provides similar functionality to is-promise by checking if a value is a promise. It is also lightweight and straightforward to use, making it a good alternative.

is-promise-like

The is-promise-like package checks if a value is promise-like, meaning it has a then method. This package is slightly more lenient than is-promise, as it does not require the value to be an actual Promise object.

README

is-promise

Test whether an object looks like a promises-a+ promise

Installation

$ npm install is-promise

You can also use it client side via npm.

API

import isPromise from 'is-promise';

isPromise(Promise.resolve());//=>true
isPromise({then:function () {...}});//=>true
isPromise(null);//=>false
isPromise({});//=>false
isPromise({then: true})//=>false

License

MIT