error-class

Error Class

This module provides typed errors that closely emulate the native Error class to a pedantic degree.

$ npm install error-class

Usage

The default export is a function that accepts only one argument, the name of the typed error.

var errorClass = require('error-class')

var SpecialError = errorClass('SpecialError')

var instance = new SpecialError('foobar')
instance.message // 'foobar'

Details

import errorClass from 'error-class'

const HumanError = errorClass('HumanError')

const hungryError = new HumanError(`I'm hungry!`)
hungryError.name // 'HumanError'
hungryError.message // `I'm hungry!`
hungryError.stack // Platform-specific error stack trace.
hungryError.hasOwnProperty('name') // false (!)
hungryError.hasOwnProperty('message') // true
hungryError.hasOwnProperty('stack') // true


// Just like native errors, it doesn't require using `new`.
const thirstyError = HumanError(`I'm thirsty!`)
Object.keys(thirstyError).length === 0 // True, all properties are non-enumerable.
Object.keys(Object.getPrototypeOf(instance)).length === 0 // Prototype non-enumerable.
thirstyError.constructor === HumanError // True.
thirstyError.constructor.name === 'HumanError' // True.
thirstyError instanceof Error // True, errors inherit from native `Error` class.
thirstyError instanceof HumanError // Also true, of course.

License

This software is licensed under the MIT License.