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https://github.com/sindresorhus/loud-rejection

Make unhandled promise rejections fail loudly instead of the default silent fail
https://github.com/sindresorhus/loud-rejection

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Make unhandled promise rejections fail loudly instead of the default silent fail

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# loud-rejection



> 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.



This tool keeps track of unhandled rejections globally. If any remain unhandled at the end of your process, it logs them to STDERR and exits with code 1.



Use this in top-level things like tests, CLI tools, apps, etc, **but not in reusable modules.**


Not needed in the browser as unhandled rejections are shown in the console.



**With [Node.js 15](https://medium.com/@nodejs/node-js-v15-0-0-is-here-deb00750f278), this package is moot as the default behavior then is to throw on unhandled rejections.**



## Install



```

$ npm install loud-rejection

```



## Usage



```js

const loudRejection = require('loud-rejection');

const promiseFunction = require('promise-fn');



// Install the `unhandledRejection` listeners

loudRejection();



promiseFunction();

```



Without this module it's more verbose and you might even miss some that will fail silently:



```js

const promiseFunction = require('promise-fn');



function error(error) {

	console.error(error.stack);

	process.exit(1);

}



promiseFunction().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`


Default: `console.error`



Custom logging function to print the rejected promise. Receives the error stack.



## Related



- [hard-rejection](https://github.com/sindresorhus/hard-rejection) - Make unhandled promise rejections fail hard right away instead of the default silent fail

- [More…](https://github.com/sindresorhus/promise-fun)



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