`Promise#finally()` ponyfill - Invoked when the promise is settled regardless of outcome
The p-finally npm package is designed to allow you to attach a handler that will be called when a promise is settled (either fulfilled or rejected). This is useful for running cleanup code or finalizing operations, regardless of the promise's outcome.
Attaching a finally handler to a promise
This feature allows you to execute code after a promise has been settled, regardless of whether it was fulfilled or rejected. It's particularly useful for cleanup operations.
const pFinally = require('p-finally');
const promise = new Promise((resolve, reject) => {
// Some asynchronous operation
});
pFinally(promise, () => {
// Code to run on promise settlement
});Bluebird is a comprehensive promise library that includes a .finally() method among its wide array of features. Compared to p-finally, Bluebird offers a much broader set of promise-related utilities, but it's also larger in size, which might be an overkill for projects only needing a finally functionality.
Q is another promise library that supports a .finally() method. Similar to Bluebird, Q provides a wide range of promise manipulation capabilities. It's more feature-rich than p-finally but also larger, making p-finally a lightweight alternative if the finally functionality is the main requirement.
Promise#finally()ponyfill - Invoked when the promise is settled regardless of outcome
Useful for cleanup.
$ npm install p-finally
import pFinally from 'p-finally';
const directory = createTempDirectory();
await pFinally(write(directory), () => {
cleanup(directory);
});
Returns a Promise.
Type: Function
Note: Throwing or returning a rejected promise will reject promise with the rejection reason.
FAQs
`Promise#finally()` ponyfill - Invoked when the promise is settled regardless of outcome
We found that p-finally 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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