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 validateArgumentsLength = require('../internals/validate-arguments-length'); var itoc = require('../internals/base64-map').itoc; var $btoa = getBuiltIn('btoa'); var charAt = uncurryThis(''.charAt); var charCodeAt = uncurryThis(''.charCodeAt); var NO_ARG_RECEIVING_CHECK = !!$btoa && !fails(function () { $btoa(); }); var WRONG_ARG_CONVERSION = !!$btoa && fails(function () { return $btoa(null) !== 'bnVsbA=='; }); var WRONG_ARITY = !!$btoa && $btoa.length !== 1; // `btoa` method // https://html.spec.whatwg.org/multipage/webappapis.html#dom-btoa $({ global: true, enumerable: true, forced: NO_ARG_RECEIVING_CHECK || WRONG_ARG_CONVERSION || WRONG_ARITY }, { btoa: function btoa(data) { validateArgumentsLength(arguments.length, 1); if (NO_ARG_RECEIVING_CHECK || WRONG_ARG_CONVERSION || WRONG_ARITY) return $btoa(toString(data)); var string = toString(data); var output = ''; var position = 0; var map = itoc; var block, charCode; while (charAt(string, position) || (map = '=', position % 1)) { charCode = charCodeAt(string, position += 3 / 4); if (charCode > 0xFF) { throw new (getBuiltIn('DOMException'))('The string contains characters outside of the Latin1 range', 'InvalidCharacterError'); } block = block << 8 | charCode; output += charAt(map, 63 & block >> 8 - position % 1 * 8); } return output; } });