* Always export typedefs
This actually just required deleting a check in declareModuleMembers
and checking for external AND commonjs modules in a couple of places.
However, while experimenting with this feature, I discovered that even
previously-exported typedefs would only be exported if they came after a
commonjs export node. So I added a commonjs check to the pass in the
parser. It will not catch nested module.exports, but it will catch
top-level assignments.
The new test tests both changes.
* Post-bind typedef instead of pre-checking for commonjs
* Duplicate identifier errors
* Fix class type reference resolution+update baselines
* Move to a type-based check for duplicate identifiers