function logWithConfig(config: { level: 'log' | 'warn' | 'error', message?: string }) { return function (target: any, propertyKey: string, descriptor: PropertyDescriptor) { const originalMethod = descriptor.value; descriptor.value = function (...args: any[]) { const { message = 'Processing payment' } = config; console.log(`${message}: ${propertyKey}`); const result = originalMethod.apply(this, args); console.log(`${propertyKey} completed`); return result; }; return descriptor; }; } class PaymentService { @logWithConfig({ level: 'log', message: 'Processing payment' }) processPayment(amount: number) { console.log(`Processing payment of $${amount}`); } } const ps = new PaymentService(); ps.processPayment(25);