A more elegant implementation of a polyfill for replaceAll method on strings by Chris Ferdinandi (source https://vanillajstoolkit.com/polyfills/stringreplaceall/ )

String.replaceAll.js

/**
 * String.prototype.replaceAll() polyfill
 * https://vanillajstoolkit.com/polyfills/stringreplaceall/
 * @author Chris Ferdinandi
 * @license MIT
 */
if (!String.prototype.replaceAll) {
	String.prototype.replaceAll = function(str, newStr){

		// If a regex pattern
		if (Object.prototype.toString.call(str).toLowerCase() === '[object regexp]') {
			return this.replace(str, newStr);
		}

		// If a string
		return this.replace(new RegExp(str, 'g'), newStr);

	};
}