web.atob.js
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	var $ = require('../internals/export');
	var getBuiltIn = require('../internals/get-built-in');
	var uncurryThis = require('../internals/function-uncurry-this');
	var fails = require('../internals/fails');
	var toString = require('../internals/to-string');
	var hasOwn = require('../internals/has-own-property');
	var validateArgumentsLength = require('../internals/validate-arguments-length');
	var ctoi = require('../internals/base64-map').ctoi;

	var disallowed = /[^\d+/a-z]/i;
	var whitespaces = /[\t\n\f\r ]+/g;
	var finalEq = /[=]+$/;

	var $atob = getBuiltIn('atob');
	var fromCharCode = String.fromCharCode;
	var charAt = uncurryThis(''.charAt);
	var replace = uncurryThis(''.replace);
	var exec = uncurryThis(disallowed.exec);

	var NO_SPACES_IGNORE = fails(function () {
	return $atob(' ') !== '';
	});

	var NO_ENCODING_CHECK = !fails(function () {
	$atob('a');
	});

	var NO_ARG_RECEIVING_CHECK = !NO_SPACES_IGNORE && !NO_ENCODING_CHECK && !fails(function () {
	$atob();
	});

	var WRONG_ARITY = !NO_SPACES_IGNORE && !NO_ENCODING_CHECK && $atob.length !== 1;

	// `atob` method
	// https://html.spec.whatwg.org/multipage/webappapis.html#dom-atob
	$({ global: true, enumerable: true, forced: NO_SPACES_IGNORE \|\| NO_ENCODING_CHECK \|\| NO_ARG_RECEIVING_CHECK \|\| WRONG_ARITY }, {
	atob: function atob(data) {
	validateArgumentsLength(arguments.length, 1);
	if (NO_ARG_RECEIVING_CHECK \|\| WRONG_ARITY) return $atob(data);
	var string = replace(toString(data), whitespaces, '');
	var output = '';
	var position = 0;
	var bc = 0;
	var chr, bs;
	if (string.length % 4 == 0) {
	string = replace(string, finalEq, '');
	}
	if (string.length % 4 == 1 \|\| exec(disallowed, string)) {
	throw new (getBuiltIn('DOMException'))('The string is not correctly encoded', 'InvalidCharacterError');
	}
	while (chr = charAt(string, position++)) {
	if (hasOwn(ctoi, chr)) {
	bs = bc % 4 ? bs * 64 + ctoi[chr] : ctoi[chr];
	if (bc++ % 4) output += fromCharCode(255 & bs >> (-2 * bc & 6));
	}
	} return output;
	}
	});

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