Custom Error message with status code

// custom erroe message showing class extending building Error class
class AppError extends Error {
  public statusCode: number;

  constructor(statusCode: number, message: string, stack = '') {
    super(message);
    this.statusCode = statusCode;

    if (stack) {
      this.stack = stack;
    } else {
      Error.captureStackTrace(this, this.constructor);
    }
  }
}


// use of custom error message in pre hook
// check if the department does not exist
academicDepartmentSchema.pre('findOneAndUpdate', async function (next) {
  const query = this.getQuery();
  // console.log(query);

  const isDepartmentExist = await AcademicDepartment.findOne(query);

  if (!isDepartmentExist) {
    throw new AppError(404, 'This department does not exists');
  }
  next();
});


// ===========================================

// Gloabal Error Handler

const handlerGlobalError = (
  err: any,
  req: Request,
  res: Response,
  next: NextFunction,
) => {
  const statusCode = err.statusCode || 500;
  const message = err.message || 'Something went wrong!';

  return res.status(statusCode).json({
    success: false,
    message,
    error: err,
  });
};