sheetjs/bits/87_read.js

function readSync(data, opts) {
	var zip, d = data;
	var o = opts||{};
	if(!o.type) o.type = (has_buf && Buffer.isBuffer(data)) ? "buffer" : "base64";
	switch(o.type) {
		case "base64": zip = new jszip(d, { base64:true }); break;
		case "binary": zip = new jszip(d, { base64:false }); break;
		case "buffer": zip = new jszip(d); break;
		case "file": zip=new jszip(d=_fs.readFileSync(data)); break;
		default: throw new Error("Unrecognized type " + o.type);
	}
	return parse_zip(zip, o);
}

function readFileSync(data, opts) {
	var o = opts||{}; o.type = 'file'
  var wb = readSync(data, o);
  wb.FILENAME = data;
	return wb;
}