TypeScript: декораторы и метапрограммирование

1function Log(constructor: Function) {
2  console.log('Created:', constructor.name);
3}
4
5@Log
6class MyClass {}

1function Log(target: any, key: string, descriptor: PropertyDescriptor) {
2  const original = descriptor.value;
3  descriptor.value = function(...args: any[]) {
4    console.log(`Calling ${key} with`, args);
5    return original.apply(this, args);
6  };
7}