Refactor Code

/refactor [options] <file_or_selection>

// Before
function processUsers(users) {
  for (let user of users) {
    if (user.email && user.email.includes('@')) {
      user.isValid = true;
      user.domain = user.email.split('@')[1];
    } else {
      user.isValid = false;
      user.domain = null;
    }
  }
}

// After refactoring with --extract-function
function validateEmail(email) {
  return email && email.includes('@');
}

function extractDomain(email) {
  return email.split('@')[1];
}

function processUsers(users) {
  for (let user of users) {
    if (validateEmail(user.email)) {
      user.isValid = true;
      user.domain = extractDomain(user.email);
    } else {
      user.isValid = false;
      user.domain = null;
    }
  }
}

# Before
def calculate_discount(price, customer_type):
    if customer_type == "premium":
        return price * 0.2
    elif customer_type == "regular":
        return price * 0.1
    else:
        return 0

# After refactoring with --extract-constant
PREMIUM_DISCOUNT_RATE = 0.2
REGULAR_DISCOUNT_RATE = 0.1
PREMIUM_CUSTOMER_TYPE = "premium"
REGULAR_CUSTOMER_TYPE = "regular"

def calculate_discount(price, customer_type):
    if customer_type == PREMIUM_CUSTOMER_TYPE:
        return price * PREMIUM_DISCOUNT_RATE
    elif customer_type == REGULAR_CUSTOMER_TYPE:
        return price * REGULAR_DISCOUNT_RATE
    else:
        return 0

// Before (ES5 style)
function getUserNames(users) {
  var names = [];
  for (var i = 0; i < users.length; i++) {
    if (users[i].active) {
      names.push(users[i].name);
    }
  }
  return names;
}

// After refactoring with --modernize
function getUserNames(users) {
  return users
    .filter(user => user.active)
    .map(user => user.name);
}

{
  "rules": {
    "maxFunctionLength": 20,
    "maxParameterCount": 4,
    "enforceConstantExtraction": true,
    "modernizeFeatures": true
  },
  "exclude": [
    "node_modules/**",
    "dist/**",
    "*.test.js"
  ],
  "backup": {
    "enabled": true,
    "directory": ".refactor-backups"
  }
}