build/lib/i18n.ts/stripComments
function stripComments(content: string): string {
	/**
	* First capturing group matches double quoted string
	* Second matches single quotes string
	* Third matches block comments
	* Fourth matches line comments
	*/
	const regexp = /("(?:[^\\\"]*(?:\\.)?)*")|('(?:[^\\\']*(?:\\.)?)*')|(\/\*(?:\r?\n|.)*?\*\/)|(\/{2,}.*?(?:(?:\r?\n)|$))/g;
	let result = content.replace(regexp, (match, _m1, _m2, m3, m4) => {
		// Only one of m1, m2, m3, m4 matches
		if (m3) {
			// A block comment. Replace with nothing
			return '';
		} else if (m4) {
			// A line comment. If it ends in \r?\n then keep it.
			let length = m4.length;
			if (length > 2 && m4[length - 1] === '\n') {
				return m4[length - 2] === '\r' ? '\r\n' : '\n';
			} else {
				return '';
			}
		} else {
			// We match a string
			return match;
		}
	});
	return result;
}