Function getEmojiWidth

src/ink/stringWidth.ts:106–127

(grapheme: string)

}

function getEmojiWidth(grapheme: string): number {
  // Regional indicators: single = 1, pair = 2
  const first = grapheme.codePointAt(0)!
  if (first >= 0x1f1e6 && first <= 0x1f1ff) {
    let count = 0
    for (const _ of grapheme) count++
    return count === 1 ? 1 : 2
  }

  // Incomplete keycap: digit/symbol + VS16 without U+20E3
  if (grapheme.length === 2) {
    const second = grapheme.codePointAt(1)
    if (
      second === 0xfe0f &&
      ((first >= 0x30 && first <= 0x39) || first === 0x23 || first === 0x2a)
    ) {
      return 1
    }
  }

  return 2
}

function isZeroWidth(codePoint: number): boolean {
  // Fast path for common printable range