CustomError in NodeJS

console.log

MyCustomError
true
MyCustomError: message
    at Object.<anonymous> (......./Errors.test.js:4:9)
    at Module._compile (module.js:571:32)
    at Object.Module._extensions..js (module.js:580:10)
    at Module.load (module.js:488:32)
    at tryModuleLoad (module.js:447:12)
    at Function.Module._load (module.js:439:3)
    at Module.runMain (module.js:605:10)
    at run (bootstrap_node.js:427:7)
    at startup (bootstrap_node.js:151:9)
    at bootstrap_node.js:542:3
MyCustomError
    at Object.<anonymous> (......./Errors.test.js:13:9)
    at Module._compile (module.js:571:32)
    at Object.Module._extensions..js (module.js:580:10)
    at Module.load (module.js:488:32)
    at tryModuleLoad (module.js:447:12)
    at Function.Module._load (module.js:439:3)
    at Module.runMain (module.js:605:10)
    at run (bootstrap_node.js:427:7)
    at startup (bootstrap_node.js:151:9)
    at bootstrap_node.js:542:3

Error.js

module.exports = function CustomError(message) {
  this.name = this.constructor.name
  this.message = message
  Error.captureStackTrace(this, this.constructor)
}

module.exports.prototype.inspect = function () {
  return this.stack
}

Error.test.js

class MyCustomError extends require('./Errors') {}

try {
  throw new MyCustomError ('message')
} catch (err) {
  console.log(err.constructor.name);
  console.log(err instanceof MyCustomError)
  console.log(err);
}

try {
  throw new MyCustomError ()
} catch (err) {
  console.log(err);
}

hi