const emojiRegex = require('emoji-regex');
const regex = emojiRegex();

const string = "This string has emoji 👩 and 👩🏿 modified emoji and supermodiied emoji 💂🏾‍♀️";

function stringReverse(string) {

	let match;
	const emojis = [];
	const separator = `unique_separator_${Math.random()}`;
	const reversedSeparator = [...separator].reverse().join('');

	while (match = regex.exec(string)) {
		emojis.push(emoji);
	}

	return [...string.replace(regex, separator)].reverse().join('').replace(new RegExp(reversedSeparator, 'gm'), () => emojis.pop());

}

console.log(string); // This string has emoji 👩 and 👩🏿 modified emoji and supermodiied emoji 💂🏾‍♀️
console.log(stringReverse(string)); // 💂🏾‍♀️ ijome deiidomrepus dna ijome deifidom 👩🏿 dna 👩 ijome sah gnirts sihT