Package Exports

promise.prototype.finally
promise.prototype.finally/auto
promise.prototype.finally/shim

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (promise.prototype.finally) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

promise.prototype.finally

ES Proposal spec-compliant shim for Promise.prototype.finally. Invoke its "shim" method to shim Promise.prototype.finally if it is unavailable or noncompliant. Note: a global Promise must already exist: the es6-shim is recommended.

This package implements the es-shim API interface. It works in an ES3-supported environment that has Promise available globally, and complies with the proposed spec.

Most common usage:

var assert = require('assert');
var promiseFinally = require('promise.prototype.finally');

var resolved = Promise.resolve(42);
var rejected = Promise.reject(-1);

promiseFinally(resolved, function () {
    assert.equal(arguments.length, 0);

    return Promise.resolve(true);
}).then(function (x) {
    assert.equal(x, 42);
});

promiseFinally(rejected, function () {
    assert.equal(arguments.length, 0);
}).catch(function (e) {
    assert.equal(e, -1);
});

promiseFinally(rejected, function () {
    assert.equal(arguments.length, 0);

    throw false;
}).catch(function (e) {
    assert.equal(e, false);
});

promiseFinally.shim(); // will be a no-op if not needed

resolved.finally(function () {
    assert.equal(arguments.length, 0);

    return Promise.resolve(true);
}).then(function (x) {
    assert.equal(x, 42);
});

rejected.finally(function () {
    assert.equal(arguments.length, 0);
}).catch(function (e) {
    assert.equal(e, -1);
});

rejected.finally(function () {
    assert.equal(arguments.length, 0);

    throw false;
}).catch(function (e) {
    assert.equal(e, false);
});

Tests

Simply clone the repo, npm install, and run npm test

Thanks

Huge thanks go out to @matthew-andrews, who provided the npm package name for v2 of this module. v1 is both in the original repo and preserved in a branch