Investigate ECMAScript decorators

[shrinktofit]

Now that decorators proposal comes to stage 3, we should watch on it. It will eventually become standard and seems can solve our performance problem introduced from legacy decorator model.

What we should watch:

• Decorator proposal status: https://github.com/tc39/proposal-decorators

• Babel's implementation status:

  • https://babeljs.io/docs/en/babel-plugin-proposal-decorators

• TypeScript's implementation status:

  • TypeScript Design Meeting Notes, 4/13/2022

What we should concern:

• The decorator model and performance.

• Migration.

  • Once we adopt the new specification, can we ensure the full-compatibility? I'm afraid not. The model has changed and we should consider on users' wrapping-invocation.

  • How about the legacy decorators written by users themself.