Taobao Frontend Technology
Apr 26, 2022 · Frontend Development
What’s New in TC39? Exploring Decorators, Type Annotations & Immutable Arrays
The article reviews recent TC39 proposal updates—including decorators reaching Stage 3, type annotations entering Stage 1, the Change‑Array‑by‑Copy immutable methods, RegExp set notation, decorator metadata, and native once‑only functions—explaining their motivations, new syntax, stage‑gate criteria, and example implementations for JavaScript developers.
JavaScriptTC39Type Annotations
0 likes · 24 min read