Custom error class that inherits from Error

CustomError.js

// Manual inheritance without super call. We can’t use `class` declaration
// since the Babel compilation output will call Error.call(this, arguments),
// which always returns a new Error instance instead of the instance.
// See http://www.ecma-international.org/ecma-262/6.0/#sec-error-constructor
// Apart from this change, we’re using Babel’s approach of inheritance:
// https://github.com/babel/babel/blob/v6.9.0/packages/babel-helpers/src/helpers.js#L210-L225

/* eslint-disable func-style */
function CustomError(message) {
  // NO super call here
  this.message = message;
}
/* eslint-enable func-style */

CustomError.prototype = Object.create(Error.prototype, {
  constructor: {
    value: CustomError,
    enumerable: false,
    writable: true,
    configurable: true
  },
  name: {
    value: 'CustomError',
    enumerable: true,
    writable: false,
    configurable: false
  }
});

// Inherit static methods
if (Object.setPrototypeOf) {
  Object.setPrototypeOf(CustomError, Error);
} else {
  /* eslint-disable no-proto */
  CustomError.__proto__ = Error;
  /* eslint-enable no-proto */
}