gulpfile.js

var gulp = require('gulp');
var sass = require('gulp-sass');
var header = require('gulp-header');
var cleanCSS = require('gulp-clean-css');
var rename = require("gulp-rename");
var uglify = require('gulp-uglify');
var autoprefixer = require('gulp-autoprefixer');
var pkg = require('./package.json');

// Set the banner content
var banner = ['/*!\n',
  ' * bootstra-suggest - <%= pkg.title %> v<%= pkg.version %> (<%= pkg.homepage %>)\n',
  ' * Copyright 2013-' + (new Date()).getFullYear(), ' <%= pkg.author %>\n',
  ' * Licensed under <%= pkg.license %> (https://github.com/lodev09/<%= pkg.name %>/blob/master/LICENSE)\n',
  ' */\n',
  '\n'
].join('');

// Compile and minify SCSS
gulp.task('css', function(done) {
  gulp.src('./src/**/*.scss')
    .pipe(sass.sync({
      outputStyle: 'expanded'
    }).on('error', sass.logError))
    .pipe(autoprefixer({
      browsers: ['last 2 versions'],
      cascade: false
    }))
    .pipe(header(banner, {
      pkg: pkg
    }))
    .pipe(gulp.dest('./dist'))

  gulp.src([
      './css/*.css',
      '!./css/*.min.css'
    ])
    .pipe(cleanCSS())
    .pipe(rename({
      suffix: '.min'
    }))
    .pipe(gulp.dest('./dist'));

  done();
});

// JS
gulp.task('js', function(done) {
  gulp.src([
      './src/*.js',
      '!./src/*.min.js'
    ])
    .pipe(uglify())
    .pipe(rename({
      suffix: '.min'
    }))
    .pipe(header(banner, {
      pkg: pkg
    }))
    .pipe(gulp.dest('./dist'));

  gulp.src([
      './src/*.js'
    ])
    .pipe(gulp.dest('./dist'))

  done();
});

// Default task
gulp.task('default', gulp.parallel('css', 'js'));