Ableitung von Error für benutzerdefinierte Ausnahmehiearchien

class ValidationError extends Error {
  constructor(public readonly field: string, message: string) {
    super(message);
    this.name = 'ValidationError';
  }
}
 
function parseAge(input: unknown): number {
  if (typeof input !== 'number') {
    throw new ValidationError('age', 'Expected age to be a number');
  }
  if (input < 0 || input > 120) {
    throw new ValidationError('age', 'Age must be between 0 and 120');
  }
  return input;
}