Compile node.js with Google Closure

Question

I have a problem with Google Closure Compiler. I want to compile NodeJS code but it seems that Google CC have some problems with require.

One example :

'use strict';

var moment = require('moment');
var crypto = require('crypto');
moment.locale('fr');

//TEMP CONFIG
var oddsProb = 0.85;


class Match {

    constructor(game, date, t1, p1, t2, p2){
        this._isLive = false;
        this.t1 = t1;
        this.t2 = t2;
        this.p1 = p1;
        this.p2 = p2;
        this.p0 = 100-p1-p2;
        this.o1 = (p1==0?0:(oddsProb*100/p1)).toFixed(2);
        this.o2 = (p2==0?0:(oddsProb*100/p2)).toFixed(2);
        this.o0 = (this.p0==0?0:(oddsProb*100/this.p0)).toFixed(2);
        this.date = moment(date);
        this.gameType = game;
        this.fromNowString = this.date.fromNow();
        this._hashCode = crypto.createHash('md5').update(t1+t2+this.date.format("YMMDD")+this.gameType).digest("hex");
        //Validation date
        if(moment().isBefore(date)){
            this._isLive = true;
        }
    }

    serialize(){
        return {
            _id: this._hashCode.substring(0,24),
            date: this.date.valueOf(),
            t1: this.t1,
            p1: this.p1,
            t2: this.t2,
            p2: this.p2,
            p0: this.p0,
            o1: this.o1,
            o2: this.o2,
            o0: this.o0,
            gameType: this.gameType
        }
    }

    static deserialize(s){
        return new Match(s.gameType, moment(s.date), s.t1, s.p1, s.t2, s.p2);
    }

    isLive(){
        return this._isLive;
    }
}

module.exports = Match;

And in other file :

var Match = require('./match');

Google CC gives me this error : ERROR - Variable Match first declared in /src/public/routes.js

My gulpfile :

var gulp = require('gulp');
var source = './src'; // dossier de travail
var destination = './dist'; // dossier à livrer
var closureCompiler = require('google-closure-compiler').gulp();


gulp.task('js-compile', function () {
    return gulp.src(source+'/**/*.js', {base: source})
        .pipe(closureCompiler({
            compilation_level: 'SIMPLE',
            warning_level: 'VERBOSE',
            js_output_file: 'output.min.js'
        }))
        .pipe(gulp.dest(destination));
});

Any idea? Thank you!