71 lines
2.4 KiB
Markdown
71 lines
2.4 KiB
Markdown
# err-code
|
|
|
|
[![NPM version][npm-image]][npm-url] [![Downloads][downloads-image]][npm-url] [![Build Status][travis-image]][travis-url] [![Dependency status][david-dm-image]][david-dm-url] [![Dev Dependency status][david-dm-dev-image]][david-dm-dev-url] [![Greenkeeper badge][greenkeeper-image]][greenkeeper-url]
|
|
|
|
[npm-url]:https://npmjs.org/package/err-code
|
|
[downloads-image]:http://img.shields.io/npm/dm/err-code.svg
|
|
[npm-image]:http://img.shields.io/npm/v/err-code.svg
|
|
[travis-url]:https://travis-ci.org/IndigoUnited/js-err-code
|
|
[travis-image]:http://img.shields.io/travis/IndigoUnited/js-err-code/master.svg
|
|
[david-dm-url]:https://david-dm.org/IndigoUnited/js-err-code
|
|
[david-dm-image]:https://img.shields.io/david/IndigoUnited/js-err-code.svg
|
|
[david-dm-dev-url]:https://david-dm.org/IndigoUnited/js-err-code?type=dev
|
|
[david-dm-dev-image]:https://img.shields.io/david/dev/IndigoUnited/js-err-code.svg
|
|
[greenkeeper-image]:https://badges.greenkeeper.io/IndigoUnited/js-err-code.svg
|
|
[greenkeeper-url]:https://greenkeeper.io/
|
|
|
|
Create new error instances with a code and additional properties.
|
|
|
|
|
|
## Installation
|
|
|
|
```console
|
|
$ npm install err-code
|
|
// or
|
|
$ bower install err-code
|
|
```
|
|
|
|
The browser file is named index.umd.js which supports CommonJS, AMD and globals (errCode).
|
|
|
|
|
|
## Why
|
|
|
|
I find myself doing this repeatedly:
|
|
|
|
```js
|
|
var err = new Error('My message');
|
|
err.code = 'SOMECODE';
|
|
err.detail = 'Additional information about the error';
|
|
throw err;
|
|
```
|
|
|
|
|
|
## Usage
|
|
|
|
Simple usage.
|
|
|
|
```js
|
|
var errcode = require('err-code');
|
|
|
|
// fill error with message + code
|
|
throw errcode(new Error('My message'), 'ESOMECODE');
|
|
// fill error with message + code + props
|
|
throw errcode(new Error('My message'), 'ESOMECODE', { detail: 'Additional information about the error' });
|
|
// fill error with message + props
|
|
throw errcode(new Error('My message'), { detail: 'Additional information about the error' });
|
|
```
|
|
|
|
## Pre-existing fields
|
|
|
|
If the passed `Error` already has a `.code` field, or fields specified in the third argument to `errcode` they will be overwritten, unless the fields are read only or otherwise throw during assignment in which case a new object will be created that shares a prototype chain with the original `Error`. The `.stack` and `.message` properties will be carried over from the original error and `.code` or any passed properties will be set on it.
|
|
|
|
|
|
## Tests
|
|
|
|
`$ npm test`
|
|
|
|
|
|
## License
|
|
|
|
Released under the [MIT License](http://www.opensource.org/licenses/mit-license.php).
|