gulpfile.js

"use strict";

const gulp = require('gulp'),
    notify = require("gulp-notify"),
    uglify = require('gulp-uglify'),
    concat = require('gulp-concat');

let config = {
    jsPath: './js/modules',
    jsCompressPath: './js/build/compress',
    sassPath: './scss',
    tomcat: '/Users/clovisneto/Liferay/SIGEX/liferay-portal-6.2-ee-sp13/tomcat-7.0.62/',
    themeFolder: 'webapps/sigex-theme'
}

gulp.task('compress', function() {
  return gulp.src(config.jsPath +'/*.js')
    .pipe(uglify())
    .pipe(gulp.dest(config.jsCompressPath))
    .pipe(gulp.dest(config.tomcat + config.themeFolder + '/js/build/compress')).on('end', function(){
      gulp.src(config.jsCompressPath +'/*.js').pipe(concat('main.js'))
      .pipe(gulp.dest('./js/build'))
      .pipe(gulp.dest(config.tomcat + config.themeFolder + '/js/build/'))
      .pipe(notify("Javascript OK!"));
    })
});

// Rerun the task when a file changes
gulp.task('watch', function() {
  gulp.watch(config.jsPath + '/**/*.js', ['compress']);

});

gulp.task('default', ['compress','watch']);