As far as I can see, the file 1_types.js is explicitly excluded from indexing (note that little cross in the upper left corner of its icon), so the advanced syntax highlighting, etc. is disabled for it
This usually happens with files that are emitted by the built-in Typescript compiler - they are auto-excluded to avoid showing duplicates in completion/navigation/etc. and for better performance
As far as I can see, the file 1_types.js is explicitly excluded from indexing (note that little cross in the upper left corner of its icon), so the advanced syntax highlighting, etc. is disabled for it
This usually happens with files that are emitted by the built-in Typescript compiler - they are auto-excluded to avoid showing duplicates in completion/navigation/etc. and for better performance