Co-e NPM | npm.io

co-e

Better error stack and error controlling for co and koa

Installation

$ npm install co-e

Example

var e = require('co-e');

// better error stack for debugging
try {
  var resp = yield e(somethingWillGoWrong());
  // Or
  var resp = yield e('should return something', somethingWillGoWrong());
} catch(err) {
  console.log(err.stack); //=> Better error stack
}

// defer without label
var a = yield e.defer(somethingWillGoWrong());
// Still running...
if (e.hasError()) { // Chech the last time e.defer
  console.log(e.error().stack);
}

// defer with labels
var foo = yield e.defer('foo', somethingWillGoWrong());
var bar = yield e.defer('bar', somethingWillGoWrong());

if (e.hasError('foo') && e.hasError('bar')) {
  // ...
}

API

e(label, gen)
e.defer(label, gen)
e.hasError(label)
e.error(label)

Why `co-e`?

function somethingWrong will be called in example.js.

Before

Error: Something wrong
    at somethingWrong (/path/to/script/examples.js:5:9)
    at GeneratorFunctionPrototype.next (native)
    at onFulfilled (/path/to/script/node_modules/co/index.js:61:19)
    at /path/to/script/node_modules/co/index.js:50:5
    at co (/path/to/script/node_modules/co/index.js:49:10)
    at toPromise (/path/to/script/node_modules/co/index.js:114:63)
    at next (/path/to/script/node_modules/co/index.js:95:29)
    at onFulfilled (/path/to/script/node_modules/co/index.js:65:7)
    at /path/to/script/node_modules/co/index.js:50:5
    at co (/path/to/script/node_modules/co/index.js:49:10)

After

Error: Something wrong
    at somethingWrong (/path/to/script/examples.js:5:9)
    at /path/to/script/examples.js:61:9
    at GeneratorFunctionPrototype.next (native)
    at onFulfilled (/path/to/script/node_modules/co/index.js:61:19)
    at /path/to/script/node_modules/co/index.js:50:5
    at co (/path/to/script/node_modules/co/index.js:49:10)
    at Object.<anonymous> (/path/to/script/examples.js:60:1)
    at Module._compile (module.js:446:26)
    at Object.Module._extensions..js (module.js:464:10)
    at Module.load (module.js:341:32)

Contributing

Fork this repo
Clone your repo
Install dependencies
Checkout a feature branch
Feel free to add your features
Make sure your features are fully tested
Open a pull request, and enjoy <3

MIT license

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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