Javascript RegExp.escape ponyfill

regexp_escape.mjs

// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/escape#return_value
const R = /(^[0-9a\-zA-Z]|[,-=<>#&!%:;@~'`"])|([\^\$\\\.\*\+\?\(\)\[\]\{\}\|\/])|([\t\f\n\v\r\x20])|((?![\u0000-\u007f])\s)|([\ud800-\udbff](?=$|[^\udc00-\udfff])|(?<=^|[^\ud800-\udbff])[\udc00-\udfff])/g;
const W = { "\u0009": '\\t', "\u000c": '\\f', "\u000a": '\\n', "\u000b": '\\v', "\u000d": '\\r', "\u0020": '\\x20' };

export function escape(s) {
	if (typeof s !== 'string')
		throw new TypeError("input argument must be a string")

	return s.replaceAll(
		R,
		(m, hex, backslash, ascii_whitespace, nonascii_whitespace, lone_surrogate) => {
			if (hex !== undefined)
				return `\\x${hex.charCodeAt(0).toString(16).padStart(2, "0")}`;
			if (backslash !== undefined)
				return `\\${backslash}`;
			if (ascii_whitespace !== undefined)
				return W[ascii_whitespace];
			if (nonascii_whitespace !== undefined)
				return `\\u${nonascii_whitespace.charCodeAt(0).toString(16).padStart(4, "0")}`;
			if (lone_surrogate !== undefined)
				return `\\u${lone_surrogate.charCodeAt(0).toString(16).padStart(4, "0")}`;
			return m;
		}
	);
}

export default (RegExp.escape ?? escape);