string.prototype.trimleft/polyfill.js

ES2019 spec-compliant String.prototype.trimLeft shim.

'use strict';

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

module.exports = function getPolyfill() {
	if (!String.prototype.trimLeft) {
		return implementation;
	}
	var zeroWidthSpace = '\u200b';
	if (zeroWidthSpace.trimLeft() !== zeroWidthSpace) {
		return implementation;
	}
	return String.prototype.trimLeft;
};