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backend/node_modules/string-width/index.js

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+import stripAnsi from 'strip-ansi';
+import eastAsianWidth from 'eastasianwidth';
+import emojiRegex from 'emoji-regex';
+
+export default function stringWidth(string, options = {}) {
+	if (typeof string !== 'string' || string.length === 0) {
+		return 0;
+	}
+
+	options = {
+		ambiguousIsNarrow: true,
+		...options
+	};
+
+	string = stripAnsi(string);
+
+	if (string.length === 0) {
+		return 0;
+	}
+
+	string = string.replace(emojiRegex(), '  ');
+
+	const ambiguousCharacterWidth = options.ambiguousIsNarrow ? 1 : 2;
+	let width = 0;
+
+	for (const character of string) {
+		const codePoint = character.codePointAt(0);
+
+		// Ignore control characters
+		if (codePoint <= 0x1F || (codePoint >= 0x7F && codePoint <= 0x9F)) {
+			continue;
+		}
+
+		// Ignore combining characters
+		if (codePoint >= 0x300 && codePoint <= 0x36F) {
+			continue;
+		}
+
+		const code = eastAsianWidth.eastAsianWidth(character);
+		switch (code) {
+			case 'F':
+			case 'W':
+				width += 2;
+				break;
+			case 'A':
+				width += ambiguousCharacterWidth;
+				break;
+			default:
+				width += 1;
+		}
+	}
+
+	return width;
+}