number.isnan/polyfill.js

ES2015-compliant shim for Number.isNaN - the global isNaN returns false positives.

'use strict';

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

module.exports = function getPolyfill() {
	if (Number.isNaN && Number.isNaN(NaN) && !Number.isNaN('a')) {
		return Number.isNaN;
	}
	return implementation;
};