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53 lines
1.9 KiB
Markdown
53 lines
1.9 KiB
Markdown
9 years ago
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# bluebird-tap-error
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Like `.tap` in Bluebird, but for errors. Sees errors, but doesn't catch them. Handy when you want to peek at errors, but want to do the actual error handling elsewhere.
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[![](//img.shields.io/gratipay/joepie91.svg)](https://gratipay.com/joepie91)
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## License
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[WTFPL](http://www.wtfpl.net/txt/copying/) or [CC0](https://creativecommons.org/publicdomain/zero/1.0/), whichever you prefer. A donation and/or attribution are appreciated, but not required.
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## Donate
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My income consists entirely of donations for my projects. If this module is useful to you, consider [making a donation](http://cryto.net/~joepie91/donate.html)!
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You can donate using Bitcoin, PayPal, Gratipay, Flattr, cash-in-mail, SEPA transfers, and pretty much anything else.
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## Contributing
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Pull requests welcome. Please make sure your modifications are in line with the overall code style, and ensure that you're editing the `.coffee` files, not the `.js` files.
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Build tool of choice is `gulp`; simply run `gulp` while developing, and it will watch for changes.
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Be aware that by making a pull request, you agree to release your modifications under the licenses stated above.
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## Usage
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A simple example:
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```javascript
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var Promise = require("bluebird");
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var tapError = require("bluebird-tap-error");
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Promise.try(function() {
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return someBrokenAsyncThing();
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}).catch(tapError(function(err) {
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console.log("We saw an error!", err);
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})).catch(function(err) {
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/* The actual error handling goes here. */
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})
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```
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## API
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### tapError(func)
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Wrap an error handling function in this function to make it tap into errors.
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If an error occurred, it will be received by `func` (like it would happen for a normal `.catch`). The error is passed through as-is so that it can be handled elsewhere.
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Any return value from this callback is ignored - including when the return value is a rejected Promise. You can *only* look at the error, and nothing else.
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* __func__: The callback to use.
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