Custom error in JS

e.js

class GoodError extends Error {
    constructor(...args) {
        super(...args);
        this.name = 'GoodError';
        Error.captureStackTrace(this, GoodError);
    }
}

e.ts

export class GoodError extends Error {
  public name = 'GoodError';

  constructor(...args) {
    super(...args);
    Error.captureStackTrace(this, GoodError);
  }
}

JSON.stringify(err, Object.getOwnPropertyNames(err))