Very simple logger in nodejs

logger.js

var fs = require('fs');
var Logger = {
    file: null,
    define: function (externFile) {
        fs.exists(externFile, function (exist) {
            if (!exist) {
                fs.writeFile(externFile, function (err, data) {
                    if (err) throw err;
                });
            }
        });
        this.file = externFile;
    },
    showFile: function () {
        return this.file;
    },
    getDate: function () {
        var now     = new Date();
        var annee   = now.getFullYear();
        var mois    = now.getMonth() + 1;
        var jour    = now.getDate();
        var heure   = now.getHours();
        var minute  = now.getMinutes();
        var seconde = now.getSeconds();
        return "[" + jour + "/" + mois + "/" + annee + " " + heure + ":"+ minute + ":" + seconde + "]";
    },
    write: function (file, type, message) { //deprecated
        var date = this.getDate();
        var string = "[" + type + "]";
        string += date;
        string += " " + message + "\n";
        var log = fs.createWriteStream(file, {'flags': 'a'});
        log.end(string);
    },
    success: function (message) {
        var date = this.getDate();
        var string = "[success]" + date + " " + message + "\n";
        var log = fs.createWriteStream(this.showFile(), {'flags': 'a'});
        log.end(string);
    },
    error: function (message) {
        var date = this.getDate();
        var string = "[error]" + date + " " + message + "\n";
        var log = fs.createWriteStream(this.showFile(), {'flags': 'a'});
        log.end(string);
    },
    info: function (message) {
        var date = this.getDate();
        var string = "[info]" + date + " " + message + "\n";
        var log = fs.createWriteStream(this.showFile(), {'flags': 'a'});
        log.end(string);
    },
    clean: function () {
        fs.truncate(this.showFile(), '', console.log("File : " + this.showFile() + " has been clean"));
    },
    fetchContent: function (type) {
        type = type || false;
        var retour;
        fs.readFile(this.showFile(), 'utf-8', function (err, data) {
            if (!type) {
                retour = data.split('\n');
            } else {
                retour = [];
                var reg = /^[.+]$/;
                if (type == "success")  {
                    reg = /^\[success.*$/;
                } else if (type == "error") {
                    reg = /^\[error.*$/;
                } else if (type == "info") {
                    reg = /^\[info.*$/;
                }
                for (var i = 0; i < data.split('\n').length; i++) {
                    if (reg.test(data.split('\n')[i])) {
                        retour.push(data.split('\n')[i]);
                    }
                }
            }
            return retour;
        });
    }
};
module.exports = Logger;