Track the list of currently unhandled promise rejections.
$ npm install --save currently-unhandled
const currentlyUnhandled = require('currently-unhandled')(); // <- note the invocation
var fooError = new Error('foo');
var p = Promise.reject(new Error('foo'));
// on the next tick - unhandled rejected promise is added to the list:
currentlyUnhandled();
//=> [{promise: p, reason: fooError}]'
p.catch(() => {});
// on the next tick - handled promise is now removed from the list:
currentlyUnhandled();
//=> [];
Returns an array of objects with promise
and reason
properties representing the rejected promises that currently do not have a rejection handler. The list grows and shrinks as unhandledRejections are published, and later handled.
This module can be bundled with browserify
. At time of writing, it will work with native Promises in the Chrome browser only. For best cross-browser support, use bluebird
instead of native Promise support in browsers.
MIT © James Talmage
# currently-unhandled [![Build Status](https://travis-ci.org/jamestalmage/currently-unhandled.svg?branch=master)](https://travis-ci.org/jamestalmage/currently-unhandled) [![Coverage Status](https://coveralls.io/repos/github/jamestalmage/currently-unhandled/badge.svg?branch=master)](https://coveralls.io/github/jamestalmage/currently-unhandled?branch=master) > Track the list of currently unhandled promise rejections. ## Install ``` $ npm install --save currently-unhandled ``` ## Usage ```js const currentlyUnhandled = require('currently-unhandled')(); // <- note the invocation var fooError = new Error('foo'); var p = Promise.reject(new Error('foo')); // on the next tick - unhandled rejected promise is added to the list: currentlyUnhandled(); //=> [{promise: p, reason: fooError}]' p.catch(() => {}); // on the next tick - handled promise is now removed from the list: currentlyUnhandled(); //=> []; ``` ## API ### currentlyUnhandled() Returns an array of objects with `promise` and `reason` properties representing the rejected promises that currently do not have a rejection handler. The list grows and shrinks as unhandledRejections are published, and later handled. ## Browser Support This module can be bundled with `browserify`. At time of writing, it will work with native Promises in the Chrome browser only. For best cross-browser support, use `bluebird` instead of native Promise support in browsers. ## License MIT © [James Talmage](http://github.com/jamestalmage)