mTHMMY/gulpfile.js

var gulp = require('gulp');
var sass = require('gulp-sass');
var cleanCSS = require('gulp-clean-css');
var rename = require("gulp-rename");
var autoprefixer = require('gulp-autoprefixer');
var browserSync = require('browser-sync').create();

// Compile SCSS
gulp.task('css:compile', function() {
  return gulp.src('./scss/**/*.scss')
    .pipe(sass.sync({
      outputStyle: 'expanded'
    }).on('error', sass.logError))
    .pipe(autoprefixer({
      browsers: ['last 2 versions'],
      cascade: false
    }))
    .pipe(gulp.dest('./css'))
});

// Minify CSS
gulp.task('css:minify', ['css:compile'], function() {
  return gulp.src([
      './css/*.css',
      '!./css/*.min.css'
    ])
    .pipe(cleanCSS())
    .pipe(rename({
      suffix: '.min'
    }))
    .pipe(gulp.dest('./css'))
    .pipe(browserSync.stream());
});

// CSS
gulp.task('css', ['css:compile', 'css:minify']);

// Default task
gulp.task('default', ['css']);

// Configure the browserSync task
gulp.task('browserSync', function() {
  browserSync.init({
    server: {
      baseDir: "./"
    }
  });
});

// Dev task
gulp.task('dev', ['css', 'browserSync'], function() {
  gulp.watch('./scss/*.scss', ['css']);
  gulp.watch('./*.html', browserSync.reload);
});