1class CustomError extends Error {
2  constructor(foo = 'bar', ...params) {
3    // Pass remaining arguments (including vendor specific ones) to parent constructor
4    super(...params)
5
6    // Maintains proper stack trace for where our error was thrown (only available on V8)
7    if (Error.captureStackTrace) {
8      Error.captureStackTrace(this, CustomError)
9    }
10
11    this.name = 'CustomError'
12    // Custom debugging information
13    this.foo = foo
14    this.date = new Date()
15  }
16}
17
18try {
19  throw new CustomError('baz', 'bazMessage')
20} catch(e) {
21  console.error(e.name)    //CustomError
22  console.error(e.foo)     //baz
23  console.error(e.message) //bazMessage
24  console.error(e.stack)   //stacktrace
25}

1class Testing extends Error {
2  constructor(message) {
3    super(message);
4    this.name = this.constructor.name;
5    this.message = message;
6    Error.captureStackTrace(this, this.constructor);
7  }
8}