p-is-promise
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Package description
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.
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')); // falseSimilar 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.
While not limited to promises, is-thenable checks if a value is 'thenable', meaning it has a then method like a Promise. This can be broader than just checking for promises, as it includes any object that implements the then method, making it useful in more generic situations where you might deal with promise-like objects.
Readme
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.
$ npm install p-is-promise
const pIsPromise = require('p-is-promise');
const Bluebird = require('bluebird');
pIsPromise(Promise.resolve('🦄'));
//=> true
pIsPromise(Bluebird.resolve('🦄'));
//=> true
pIsPromise('🦄');
//=> false
MIT © Sindre Sorhus
FAQs
Check if something is a promise
The npm package p-is-promise receives a total of 5,412,750 weekly downloads. As such, p-is-promise popularity was classified as popular.
We found that p-is-promise demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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