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'use strict';

var implementation = require('./implementation');

var zeroWidthSpace = '\u200b';
var mongolianVowelSeparator = '\u180E';

module.exports = function getPolyfill() {
	if (
		String.prototype.trim
		&& zeroWidthSpace.trim() === zeroWidthSpace
		&& mongolianVowelSeparator.trim() === mongolianVowelSeparator
		&& ('_' + mongolianVowelSeparator).trim() === ('_' + mongolianVowelSeparator)
		&& (mongolianVowelSeparator + '_').trim() === (mongolianVowelSeparator + '_')
	) {
		return String.prototype.trim;
	}
	return implementation;
};