ICU
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ICU
Emoji Ecosystem絵文字処理を含むUnicodeと国際化のサポートを提供する、広く使われているオープンソースライブラリ「International Components for Unicode」。
ICU is the reference implementation for Unicode algorithms. It provides C/C++ and Java libraries for text handling, including: character encoding conversion, text boundary analysis (critical for emoji grapheme clusters), collation (sorting), and locale-sensitive formatting.Many platforms and languages use ICU internally: Node.js, Python, Android, macOS/iOS, and most web browsers. The `Intl.Segmenter` API in JavaScript, which correctly splits text including emoji, is typically backed by ICU.
ICU also provides emoji-aware text segmentation, which is essential for correctly counting and manipulating emoji in strings.