How to use the xlsjs.readFile function in xlsjs

readXLS = function(filename) {
	// console.time(filename);
	// var workbook, worksheet, datasheet;
	try {
		var name = filename.split('.');
		if (name[name.length - 1] == 'xlsx')
			workbook = XLSX.readFile(filename);
		else workbook = XLS.readFile(filename);
		// var datasheet = workbook.Sheets['data'];
		// var worksheet = workbook.Sheets['metadata'];
		// if (datasheet == null || worksheet == null) {
		// 	process.stderr.write("Can't read sheets from file!");
		// 	process.exit(13);
		// 	return null;}
	} catch(e) {
		process.stderr.write(e.toString());
		process.exit(14);
		return null;}
	return workbook;
}

exports.readJSON = function(filename) {
	console.time(filename);
	var workbook, worksheet, datasheet;
	try {
		var name = filename.split('.');
		if (name[name.length - 1] == 'xlsx')
			workbook = XLSX.readFile(filename);
		else workbook = XLS.readFile(filename);
		var datasheet = workbook.Sheets['data'];
		var worksheet = workbook.Sheets['metadata'];
		if (datasheet == null || worksheet == null) {
			process.stderr.write("Can't read sheets from file!");
			process.exit(13);
			return null;}
	} catch(e) {
		process.stderr.write(e.toString());
		process.exit(14);
		return null;}
	var result = {};
	try {
		var dataset_name = GetValue(worksheet, 'dataset');
		result[dataset_name] = {};
		result[dataset_name]['note'] = GetValue(worksheet, 'dataset.note');
		result[dataset_name]['label'] = GetValue(worksheet, 'dataset.note');

var XLS = require('xlsjs');
var _ = require('underscore');
var fs = require('fs');


var workbook = XLS.readFile('./data/asylum-data.xls');

//console.log(workbook);
//console.log(workbook.SheetNames);

var months = _.range(1, 8);

var originCountries = ['SYR', 'AFG', 'SRB', 'IRQ', 'ALB', 'ERT', 'PAK', 'SOM', 'CHI', 'UKR'];

var asylumCountries = _.range(10, 56).map(function(number) {
	var cell = workbook.Sheets.SYR["A" + number];

	var country;
	if (number == 50) {
		country = "USA";

	} else if (cell == null) {

VB.prototype.load_excel = function(input) {
  return xlsjs.readFile(input);
}

reporter.beforeRenderListeners.add(definition.name, this, function(req, res) {

        if (req.files && req.files.file) {
            var file = req.files.file;

            if (path.extname(file.path) === ".xls") {
                //TODO async!!!!
                var xls = XLS.readFile(file.path);
                var data = XLS.utils.sheet_to_row_object_array(xls.Sheets.Sheet1);
                req.data = { rows: [] };

                data.forEach(function(r) {
                    var item = {};

                    for (var key in r) {
                        if (r.hasOwnProperty(key))
                            item[key] = r[key];
                    }

                    req.data.rows.push(item);
                });
            }
        }
    });