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# loud-rejection [](https://travis-ci.org/sindresorhus/loud-rejection) [](https://coveralls.io/github/sindresorhus/loud-rejection?branch=master)
> Make unhandled promise rejections fail loudly instead of the default [silent fail](https://gist.github.com/benjamingr/0237932cee84712951a2)
By default, promises fail silently if you don't attach a `.catch()` handler to them.
Use this in top-level things like tests, CLI tools, apps, etc, **but not in reusable modules.**<br>
Not needed in the browser as unhandled promises are shown in the console.
## Install
```
$ npm install --save loud-rejection
```
## Usage
```js
const loudRejection = require('loud-rejection');
const promiseFn = require('promise-fn');
// Install the unhandledRejection listeners
loudRejection();
promiseFn();
```
Without this module it's more verbose and you might even miss some that will fail silently:
```js
const promiseFn = require('promise-fn');
function error(err) {
console.error(err.stack);
process.exit(1);
}
promiseFn().catch(error);
```
### Register script
Alternatively to the above, you may simply require `loud-rejection/register` and the unhandledRejection listener will be automagically installed for you.
This is handy for ES2015 imports:
```js
import 'loud-rejection/register';
```
## API
### loudRejection([log])
#### log
Type: `Function`<br>
Default: `console.error`
Custom logging function to print the rejected promise. Receives the error stack.
## License
MIT © [Sindre Sorhus](https://sindresorhus.com)