es-arraybuffer-base64/Uint8Array.fromBase64/shim.js

An ES-spec-compliant shim/polyfill/replacement for ArrayBuffer base64 methods that works as far down as ES3

'use strict';

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

module.exports = function shimUint8ArrayFromBase64() {
	var polyfill = getPolyfill();

	if (typeof Uint8Array === 'function') {
		define(
			Uint8Array,
			{ fromBase64: polyfill },
			{ fromBase64: function () { return Uint8Array.fromBase64 !== polyfill; } }
		);
	}

	return polyfill;
};