@auth0/auth0-spa-js/src/errors.ts

Auth0 SDK for Single Page Applications using Authorization Code Grant Flow with PKCE

export class AuthenticationError extends Error {
  constructor(
    public error: string,
    public error_description: string,
    public state: string
  ) {
    super(error_description);
    //https://github.com/Microsoft/TypeScript-wiki/blob/master/Breaking-Changes.md#extending-built-ins-like-error-array-and-map-may-no-longer-work
    Object.setPrototypeOf(this, AuthenticationError.prototype);
  }
}