gulpfile.js

// Utilities
var autoprefixer = require('gulp-autoprefixer');
var cssmin = require('gulp-cssmin');
var jsmin = require('gulp-jsmin');

// Gulp
var gulp = require('gulp');

// Gulp Plugins
var sass = require('gulp-sass');
var rename = require('gulp-rename');

// Path Config
var configPath = {
	inputCSS: 'src/*.scss',
	outputCSS: 'dist/css/',
	// Js Path
	inputJS: 'dist/js/*.js',
	outputJS: 'dist/js/'
}

gulp.task('createCSS', function () {
   // Find main `.css` file from the `src/` folder
   return gulp.src(configPath.inputCSS)
      // Run Sass on those files
      .pipe(sass({outputStyle: 'expanded'}))
      .pipe(autoprefixer({
         browser: ['last 2 versions'],
         cascade: false
      }))
      .pipe(gulp.dest(configPath.outputCSS))

		.pipe(cssmin())
		.pipe(rename({suffix: '.min'}))
      // Write the resulting CSS in the output folder
		.pipe(gulp.dest(configPath.outputCSS))		
});

// Minify JS File
gulp.task('minifyJS', function () {
   return gulp.src(configPath.inputJS)
		.pipe(jsmin())
      .pipe(rename({suffix: '.min'}))
      // Write the resulting Minify JS in the output folder
      .pipe(gulp.dest(configPath.outputJS))
});