Javascript RegExp.escape ponyfill

regexp_escape.mjs

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

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

	return s.replaceAll(NEEDS_ESCAPE, _escape);
}


export default (RegExp.escape ?? escape).bind(RegExp);
//if (!("escape" in RegExp)) RegExp.escape = escape;