Error-class NPM

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.

const errorClass = require('error-class')
const SpecialError = errorClass('SpecialError')
const instance = new SpecialError('foobar')
instance.message // 'foobar'

Details

const errorClass = require('error-class')
const HumanError = errorClass('HumanError')

const hungryError = new HumanError('I\'m hungry!')
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 instanceof Error // True, errors inherit from native `Error` class.
thirstyError instanceof HumanError // Also true, of course.