2.5.0

What's Changed

This release has no breaking API changes and focuses on making encoding.js faster and smaller: a roughly 60% reduction in minified bundle size, faster character encoding conversions, and lower memory usage.
And I've finally set up GitHub Sponsors!

Features

• Improve TypeScript definitions: support case-insensitive encoding names and aliases through EncodingName, allow string input in urlEncode() and base64Encode(), and accept typed arrays in the Zenkaku/Hankaku conversion functions (d769950)

Bug Fixes

• Fix an extra NUL byte when decoding JIS X 0212 0x2237 from EUCJP and JIS by @youdie006 in #69
• Ignore stray continuation bytes when converting from UTF8, preventing the previous character from being repeated (#71)
• Use the fallback character for values above U+10FFFF when converting from UNICODE to UTF8 (#71)
• Fix codeToString() and string output potentially throwing a RangeError on a deep call stack (055ede8)
• Fix base64Decode() to ignore non-ASCII characters (61e7dc2)
• Fix convert() to return a new array even when no conversion is needed (86f2a7e)

Performance

Smaller bundle size

Reduced the bundle size by compressing the UTF-8 to JIS conversion tables into a compact text format. Conversion results and APIs are unchanged.

The tables are expanded lazily only when a conversion is actually needed, rather than at module load time, to avoid unnecessary initialization overhead. See #70 for more details.

	v2.4.0	v2.5.0	Change
encoding.js	304 KB	148 KB	-51%
encoding.min.js	229 KB	88 KB	-62%
encoding.min.js (gzip)	76 KB	39 KB	-49%

Faster conversions

Improved conversion performance by prioritizing typed arrays.
This makes convert() about 1.5-3.5x faster for most encoding pairs (about 1.3x when converting from UTF-8) and reduces peak memory during conversion by about 25-60%.

Selected benchmark results from #71 (in ops/sec, higher is better):

Conversion	v2.4.0	v2.5.0	Speedup
SJIS -> UNICODE	64.51	160	2.5x
EUCJP -> UNICODE	65.96	182	2.8x
UNICODE -> SJIS	23.63	54.25	2.3x
UNICODE -> UTF8	54.85	183	3.3x
SJIS -> UTF8	84.82	154	1.8x
UTF8 -> SJIS	62.02	79.35	1.3x

Benchmark on Node.js v24 with the full text of "I Am a Cat" (about 350,000 characters), type: 'array'.

Other performance improvements:

• Improve codeToString() and string output performance by keeping the fast conversion path available after processing large arrays (055ede8)
• Improve the performance of stringToCode(), base64Encode(), urlDecode() and the Zenkaku/Hankaku conversion functions by preallocating result arrays, up to about 3x faster for large input (055ede8, cf887c6)

Maintenance

• Update minify options to keep encoding.min.js ES5-compatible (9a8d3b2)
• Update devDependencies (9357cc1, f0c942e)

GitHub Sponsors

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If encoding.js is useful to you, please consider supporting my work.
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New Contributors

• @youdie006 made their first contribution in #69

Full Changelog: 2.4.0...2.5.0