In JS, typedef rename and find-all-refs doesn't work across files

[sandersn]

// @Filename: mod1.js
module.exports = { e: 1, m: 1 }
/** @typedef {number} Foo */

// @Filename: use.js
/** @type {import('./mod1').Foo} */
var foo = 12

Expected behavior:
Renaming Foo in use.js should rename it. Find-all-refs on Foo in use.js should list all references

Actual behavior:
Neither work. However, goto-def does work.

[ghost]

@sandersn That example doesn't type-check (and goto-def doesn't work for me): module.exports = { e: number, m: number }; fails because number is not a value, and /** @type {Foo} */ fails because Foo was never imported. Also, I thought a comment that doesn't precede anything was ignored?

[sandersn]

1. Sorry, I typed up the repro based on code in a test buffer. I fixed the type errors.
2. I observed the problem with import('./mod1').Foo; I don't know if renaming Foo should work for `const mod1 = require('./mod1'); /** @type {mod1.Foo} */. Probably yes?
3. We have special-case code in the binder for typedef that is supposed to grab every typedef, even at the end of a file. I think they attach to the end of file node or something.