mirror of https://github.com/jkjoy/sunpeiwen.git
78 lines
2.0 KiB
Markdown
78 lines
2.0 KiB
Markdown
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# hard-rejection [](https://travis-ci.org/sindresorhus/hard-rejection)
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> Make unhandled promise rejections fail hard right away instead of the default [silent fail](https://gist.github.com/benjamingr/0237932cee84712951a2)
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Promises fail silently if you don't attach a `.catch()` handler.
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This module exits the process with an error message right away when an unhandled rejection is encountered.<br>
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**Note: That might not be desirable as unhandled rejections can be [handled at a future point in time](https://nodejs.org/api/process.html#process_event_unhandledrejection), although not common. You've been warned.**
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Intended for top-level long-running processes like servers, **but not in reusable modules.**<br>
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For command-line apps and tests, see [`loud-rejection`](https://github.com/sindresorhus/loud-rejection).
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## Install
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```
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$ npm install hard-rejection
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```
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## Usage
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```js
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const hardRejection = require('hard-rejection');
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const promiseFunction = require('some-promise-fn');
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// Install the handler
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hardRejection();
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promiseFunction();
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```
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Without this module it's more verbose and you might even miss some that will fail silently:
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```js
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const promiseFunction = require('some-promise-fn');
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function error(error) {
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console.error(error.stack);
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process.exit(1);
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}
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promiseFunction().catch(error);
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```
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### Register script
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Alternatively to the above, you may simply require `hard-rejection/register` and the handler will be automagically installed for you.
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This is handy for ES2015 imports:
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```js
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import 'hard-rejection/register';
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```
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## API
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### hardRejection([log])
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#### log
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Type: `Function`<br>
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Default: `console.error`
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Custom logging function to print the rejected promise. Receives the error stack.
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## Related
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- [loud-rejection](https://github.com/sindresorhus/loud-rejection) - Make unhandled promise rejections fail loudly instead of the default silent fail
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- [More…](https://github.com/sindresorhus/promise-fun)
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## License
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MIT © [Sindre Sorhus](https://sindresorhus.com)
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