Ah, so those folders can be out of sync then.
@Darkladen mentioned that he noticed the js/ and jsm/ folders were out of sync (differing set of classes) when he had some confusion trying to use both scripts and modules:
The js/jsm process is not so clear, and CONTRIBUTING.md made it seem as if js/ is the source of truth.
I pushed the change to the js/ folder instead of jsm/ folder.
Here’s the final patch: Comparing mrdoob:dev...trusktr:patch-21 · mrdoob/three.js · GitHub
Hope that helps.
EDIT: I didn’t update Chinese docs.