fat-function.js

export const createNewAccount = async (params) => {
  if (!params.username) {
    throw new Error('Missing required username');
  }
  
  if (!params.email) {
    throw new Error ('Missing required email');
  }
  
  if (params.username.length > 25) {
    throw new Error('Invalid username more than 25 characters');
  }
  
  if (params.username.length < 2) {
    throw new Error('Invalid username less than 2 characters');
  }
  
  const emailValidator = new EmailValidator();
  const validatedEmail = emailValidator.validate(params.email);
  
  if (!validatedEmail) {
    throw new Error('Invalid email');
  }
  
  const usernameExists = db.select('*')
    ->from('users')
    ->where('username', username)
    ->first();
  
  if (Object.keys(usernameExists).length > 0) {
    throw new Error('Username exists');
  }
  
  const emailExists = db.select('*')
    ->from('users')
    ->where('email', email)
    ->first();
  
  if (Object.keys(emailExists).length > 0) {
    throw new Error('Email exists');
  }
  
  return db.insert('username,email')
           ->values(params)
           ->table('users');
}