p-is-promise

What is p-is-promise?

The p-is-promise npm package is a simple utility that allows you to check if a value is a Promise. This can be particularly useful when dealing with asynchronous operations in JavaScript, where you might need to differentiate between promises and other types of values.

What are p-is-promise's main functionalities?

Check if a value is a Promise

This feature allows you to easily determine whether a given value is a Promise. It's useful for conditional logic where the handling of a value depends on whether it's asynchronous (a Promise) or synchronous.

const pIsPromise = require('p-is-promise');

console.log(pIsPromise(Promise.resolve())); // true
console.log(pIsPromise('not a promise')); // false

Other packages similar to p-is-promise

is-promise

Similar to p-is-promise, is-promise checks if a value is a Promise. The main difference lies in their implementation and possibly the versions of Node.js they support. Both packages serve a similar purpose, providing a straightforward way to determine if a value conforms to the Promise interface.

README

p-is-promise

Check if something is a promise

Why not is-promise? That module checks for a thenable, not an ES2015 promise. This one is stricter.

You most likely don't need this. Just pass your value to Promise.resolve() and let it handle it.

Can be useful if you need to create a fast path for a synchronous operation.

Install

$ npm install p-is-promise

Usage

const pIsPromise = require('p-is-promise');
const Bluebird = require('bluebird');

pIsPromise(Promise.resolve('🦄'));
//=> true

pIsPromise(Bluebird.resolve('🦄'));
//=> true

pIsPromise('🦄');
//=> false

Related

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