CMapCompressionType is not exported in the pdf.js distribution

[cemerick]

As implemented in #8064 and demonstrated in #8881 (comment), a CMapReaderFactory must resolve a promise with an object containing a compressionType slot, the value of which should be one of the CMapCompressionType enumeration.

Unfortunately, CMapCompressionType is not exported by pdf.js as it is currently built, so implementing CMapReaderFactory requires copy/pasting the enumeration, or maybe hard-coding the value of compressionType (e.g. if all of the cmaps being loaded from disk are known to be compressed).

No PR at this time; I can see at least three reasonable places where CMapCompressionType could be exported, but I'd rather not guess at the maintainers' desired aesthetic. 😄

[timvandermeij]

Good point. I think this should be added to

pdf.js/src/pdf.js

Line 104 in 6f30cbb

exports.Util = pdfjsSharedUtil.Util;

since Util is also there and comes from the same file.

[cemerick]

Thank you @timvandermeij and @Snuffleupagus 😄