string.prototype.padstart/shim.js

ES2017 spec-compliant String.prototype.padStart shim.

'use strict';

var getPolyfill = require('./polyfill');
var define = require('define-properties');

module.exports = function shimPadStart() {
	var polyfill = getPolyfill();
	define(String.prototype, { padStart: polyfill }, {
		padStart: function testPadStart() {
			return String.prototype.padStart !== polyfill;
		}
	});
	return polyfill;
};