ICU
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ICU
Emoji EcosystemInternational Components for Unicode — a widely-used open-source library providing Unicode and internationalization support, including emoji processing.
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.