Overview

npm install eslint-plugin-operability --save-dev

// eslint.config.js
import operability from 'eslint-plugin-operability';

export default [
  operability.configs.recommended,

  // Be extra strict in production code
  {
    files: ['src/**/*.ts'],
    ignores: ['**/*.test.ts', '**/*.spec.ts'],
    rules: {
      'operability/no-console-log': 'error',
    },
  },
];

// ❌ Bad: Debug logging in production
function processPayment(card: Card) {
  console.log('Processing payment:', card); // Exposes sensitive data!
  return paymentService.charge(card);
}

// ✅ Good: Use proper logging
function processPayment(card: Card) {
  logger.info('Processing payment', { cardLast4: card.last4 });
  return paymentService.charge(card);
}

// ❌ Bad: Debugger statement left in code
function calculateTotal(items: Item[]) {
  debugger; // Will pause execution in production!
  return items.reduce((sum, item) => sum + item.price, 0);
}

// ✅ Good: No debug statements
function calculateTotal(items: Item[]) {
  return items.reduce((sum, item) => sum + item.price, 0);
}

// ❌ Bad: Verbose error exposes internals (CWE-209)
throw new Error(
  `Database connection failed at ${host}:${port} with user ${dbUser}`,
);

// ✅ Good: Generic error with internal logging
logger.error('Database connection failed', { host, port, user: dbUser });
throw new Error('Service temporarily unavailable');