Straightforward ES6 class you can extend to make custom errors that are all instanceof Error with proper stacks.
npm install custom-error-class
const CustomError = require('custom-error-class')
class MyError extends CustomError {
constructor () {
super('an error happened')
this.code = 'SOME_CODE'
}
}
// Use this error as you normally would.
throw new MyError()
Credits to @pfrazee who wrote most of it.
MIT