112 lines
2.2 KiB
Markdown
112 lines
2.2 KiB
Markdown
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# make-error [](http://travis-ci.org/JsCommunity/make-error)
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> Make your own error types!
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## Features
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- Compatible Node & browsers
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- `instanceof` support
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- `error.name` & `error.stack` support
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- compatible with [CSP](https://en.wikipedia.org/wiki/Content_Security_Policy) (i.e. no `eval()`)
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## Installation
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### Node & [Browserify](http://browserify.org/)/[Webpack](https://webpack.js.org/)
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Installation of the [npm package](https://npmjs.org/package/make-error):
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```
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> npm install --save make-error
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```
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Then require the package:
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```javascript
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var makeError = require('make-error');
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```
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### Browser
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You can directly use the build provided at [unpkg.com](https://unpkg.com):
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```html
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<script src="https://unpkg.com/make-error@1/dist/make-error.js"></script>
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```
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## Usage
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### Basic named error
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```javascript
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var CustomError = makeError('CustomError')
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// Parameters are forwarded to the super class (here Error).
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throw new CustomError('a message')
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```
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### Advanced error class
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```javascript
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function CustomError (customValue) {
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CustomError.super.call(this, 'custom error message')
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this.customValue = customValue
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}
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makeError(CustomError)
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// Feel free to extend the prototype.
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CustomError.prototype.myMethod = function CustomError$myMethod () {
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console.log('CustomError.myMethod (%s, %s)', this.code, this.message)
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}
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//-----
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try {
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throw new CustomError(42)
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} catch (error) {
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error.myMethod()
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}
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```
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### Specialized error
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```javascript
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var SpecializedError = makeError('SpecializedError', CustomError);
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throw new SpecializedError(42);
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```
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### Inheritance
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> Best for ES2015+.
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```javascript
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import {BaseError} from 'make-error'
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class CustomError extends BaseError {
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constructor () {
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super('custom error message')
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}
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}
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```
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## Related
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- [make-error-cause](https://www.npmjs.com/package/make-error-cause): Make your own error types, with a cause!
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## Contributions
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Contributions are *very* welcomed, either on the documentation or on
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the code.
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You may:
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- report any [issue](https://github.com/JsCommunity/make-error/issues)
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you've encountered;
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- fork and create a pull request.
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## License
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ISC © [Julien Fontanet](http://julien.isonoe.net)
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