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perf: reduce bundle size by compressing conversion tables - #70
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… UTF-8 tables Move U+2016 (0xE28096) and U+00AC (0xC2AC) entries to the alias table
polygonplanet
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Store the UTF-8 to JIS conversion tables in a compressed text format and expand them on the first call to
convert().The tables are expanded lazily only when a conversion is actually needed, rather than at module load time, to avoid unnecessary initialization overhead.
The first encode now has an extra step to expand the tables (about 7ms on Node 24), but loading is faster (15ms -> 3.6ms) because the tables are much smaller, so load + first conversion is faster overall (16ms -> 11ms).
For decoding, expanding the tables takes about as long as the previous
init_JIS_TO_UTF8_TABLE()did, even though it now builds both directions at once.Conversion results are unchanged.
Follow-up: Added
tests/gen-compressed-table.jsin 48a884f to generate the compressed conversion tables insrc/from the readable source tables intests/.