is-promise
Advanced tools
Package description
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.
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)); // falseThe 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.
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.
The is-promise-object package checks if a value is an object that conforms to the Promise interface. It is similar to is-promise but focuses on ensuring the value is an object with a then method.
Readme
Test whether an object looks like a promises-a+ promise
$ npm install is-promise
You can also use it client side via npm.
import isPromise from 'is-promise';
isPromise(Promise.resolve());//=>true
isPromise({then:function () {...}});//=>true
isPromise(null);//=>false
isPromise({});//=>false
isPromise({then: true})//=>false
MIT
FAQs
Test whether an object looks like a promises-a+ promise
The npm package is-promise receives a total of 6,261,907 weekly downloads. As such, is-promise popularity was classified as popular.
We found that is-promise demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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