Summary

After #19811 we can collect the nested properties in destructuring assignment, so this PR add it and use it to enhance tree shaking for nested exports

// lib.js
export * as a from "./a";
export * as b from "./b";

// index.js
import * as lib from "./lib";
// before the referenced exports is "lib.a", only "lib.b" is tree-shaken, and everything inside "lib.a" is kept
// now the referenced exports is "lib.a.inner", only "lib.a.inner" is kept, everything else is tree-shaken
const { a: { inner } } = lib;

What kind of change does this PR introduce?

feature

Did you add tests for your changes?

Yes

Does this PR introduce a breaking change?

No

If relevant, what needs to be documented once your changes are merged or what have you already documented?

Nothing