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Viewing file:     index.js (1.57 KB)      -rw-r--r--

/* eslint-disable yoda */

export default function isFullwidthCodePoint(codePoint) {
	if (!Number.isInteger(codePoint)) {
		return false;
	}

	// Code points are derived from:
	// https://unicode.org/Public/UNIDATA/EastAsianWidth.txt
	return codePoint >= 0x1100 && (
		codePoint <= 0x115F || // Hangul Jamo
		codePoint === 0x2329 || // LEFT-POINTING ANGLE BRACKET
		codePoint === 0x232A || // RIGHT-POINTING ANGLE BRACKET
		// CJK Radicals Supplement .. Enclosed CJK Letters and Months
		(0x2E80 <= codePoint && codePoint <= 0x3247 && codePoint !== 0x303F) ||
		// Enclosed CJK Letters and Months .. CJK Unified Ideographs Extension A
		(0x3250 <= codePoint && codePoint <= 0x4DBF) ||
		// CJK Unified Ideographs .. Yi Radicals
		(0x4E00 <= codePoint && codePoint <= 0xA4C6) ||
		// Hangul Jamo Extended-A
		(0xA960 <= codePoint && codePoint <= 0xA97C) ||
		// Hangul Syllables
		(0xAC00 <= codePoint && codePoint <= 0xD7A3) ||
		// CJK Compatibility Ideographs
		(0xF900 <= codePoint && codePoint <= 0xFAFF) ||
		// Vertical Forms
		(0xFE10 <= codePoint && codePoint <= 0xFE19) ||
		// CJK Compatibility Forms .. Small Form Variants
		(0xFE30 <= codePoint && codePoint <= 0xFE6B) ||
		// Halfwidth and Fullwidth Forms
		(0xFF01 <= codePoint && codePoint <= 0xFF60) ||
		(0xFFE0 <= codePoint && codePoint <= 0xFFE6) ||
		// Kana Supplement
		(0x1B000 <= codePoint && codePoint <= 0x1B001) ||
		// Enclosed Ideographic Supplement
		(0x1F200 <= codePoint && codePoint <= 0x1F251) ||
		// CJK Unified Ideographs Extension B .. Tertiary Ideographic Plane
		(0x20000 <= codePoint && codePoint <= 0x3FFFD)
	);
}