Decorators trong TypeScript là gì?

Decorators là function đặc biệt apply lên class/method/property/accessor/parameter để modify behavior.

• Dùng @decorator syntax.
• TS 5.0+ hỗ trợ TC39 Stage 3 decorators natively (không cần flag).
• Legacy decorators (Angular, NestJS) vẫn dùng experimentalDecorators: true — hai loại không tương thích.
• Decorator factories: @Log() trả về decorator function.

Decorators are special functions applied to classes/methods/properties/accessors/parameters to modify behavior.

• Use @decorator syntax.
• TS 5.0+ supports TC39 Stage 3 decorators natively (no flag needed).
• Legacy decorators (Angular, NestJS) still use experimentalDecorators: true — the two types are incompatible.
• Decorator factories: @Log() returns a decorator function.