in src/common/base64.js [32:41]
function bufferToBinaryString (buffer) {
var bytes = new Uint8Array(buffer);
var CHUNK_SIZE = 1 << 15;
var string = '';
for (var i = 0; i < bytes.length; i += CHUNK_SIZE) {
var chunk = bytes.subarray(i, i + CHUNK_SIZE);
string += String.fromCharCode.apply(null, chunk);
}
return string;
}