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co-mono/packages/tui/CHANGELOG.md
nathyong 6e4270a286 tui: only check for emojis in visibleWidth when necessary 
The initial render of a session, and any re-draws caused by terminal
resizing are noticeably slow, especially on conversations with 20+
turns and many tool calls.

From profiling with `bun --cpu-prof` (available since bun 1.3.2), the
majority of the rendering (90%) is spent on detection of emojis in the
string-width library, running the expensive `/\p{RGI_Emoji}$/v`
regular expression on every individual grapheme cluster in the entire
scrollback. I believe it essentially expands to a fixed search against
every possible emoji sequence, hence the amount of CPU time spent in it.

This change replaces the `stringWidth` from string-width with a
`graphemeWidth` function that performs a similar check, but avoids
running the `/\p{RGI_Emoji}$/v` regex for emoji detection unless it
contains codepoints that could be emojis.

The `visibleWidth` function also has two more optimisations:
- Short-circuits string length detection for strings that are entirely
  printable ASCII characters
- Adds a cache for non-ASCII segments to avoid recomputing string length
  when resizing
2026-01-02 01:56:11 +01:00

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Changelog

[Unreleased]

Added

  • isShiftCtrlO() key detection function for Shift+Ctrl+O (Kitty protocol)
  • isShiftCtrlD() key detection function for Shift+Ctrl+D (Kitty protocol)
  • TUI.onDebug callback for global debug key handling (Shift+Ctrl+D)
  • wrapTextWithAnsi() utility now exported (wraps text to width, preserving ANSI codes)

Changed

  • README.md completely rewritten with accurate component documentation, theme interfaces, and examples
  • visibleWidth() reimplemented with grapheme-based width calculation, 10x faster on Bun and ~15% faster on Node (#369 by @nathyong)

Fixed

  • Markdown component now renders HTML tags as plain text instead of silently dropping them (#359)
  • Crash in visibleWidth() and grapheme iteration when encountering undefined code points (#372 by @HACKE-RC)
  • ZWJ emoji sequences (rainbow flag, family, etc.) now render with correct width instead of being split into multiple characters (#369 by @nathyong)

[0.29.0] - 2025-12-25

Added

  • Auto-space before pasted file paths: When pasting a file path (starting with /, ~, or .) and the cursor is after a word character, a space is automatically prepended for better readability. Useful when dragging screenshots from macOS. (#307 by @mitsuhiko)
  • Word navigation for Input component: Added Ctrl+Left/Right and Alt+Left/Right support for word-by-word cursor movement. (#306 by @kim0)
  • Full Unicode input: Input component now accepts Unicode characters beyond ASCII. (#306 by @kim0)

Fixed

  • Readline-style Ctrl+W: Now skips trailing whitespace before deleting the preceding word, matching standard readline behavior. (#306 by @kim0)