Gulpfile that watches for sass/js files and minifies them for production. Includes task for working with Bourbon (sass tool). Also has the package.json for installing dependancies. Tested!

gulpfile.js

var gulp = require('gulp');
var $    = require('gulp-load-plugins')();
var argv = require('yargs').argv;
var autoprefixer = require('gulp-autoprefixer');
var sourcemaps = require('gulp-sourcemaps');
var bourbon = require("bourbon").includePaths;

// Check for --production flag
var PRODUCTION = !!(argv.production);

// Browsers to target when prefixing CSS.
var COMPATIBILITY = ['last 2 versions', 'ie >= 9'];

// File paths to various assets are defined here.
var PATHS = {
  //assets: [
  //  'src/assets/**/*',
  //  '!src/assets/{img,js,scss}/**/*'
  //],
  css: [
    // "bower_components/normalize-css/normalize.css",
    // "bower_components/bootstrap/dist/css/bootstrap.min.css",
    // "bower_components/lightbox2/dist/css/lightbox.min.css",
  ],
  sass: [
    // 'bower_components',
    // 'bower_components/foundation-sites/scss',
    // 'bower_components/motion-ui/src/'
    // 'sass/styles.scss'
  ],
  javascript: [
    'src/js/**/*.js'
  ],
  javascriptVerdors: [
    // 'bower_components/jquery/dist/jquery.js',
    // Paths to individual JS components defined below
    // 'bower_components/popper.js/dist/popper.min.js',
    "bower_components/matchHeight/dist/jquery.matchHeight-min.js",
    // 'src/assets/js/**/!(app).js',
    // 'src/assets/js/app.js'
  ]
};

// Combine JavaScript into one file
// In production, the file is minified
gulp.task('javascript', function() {
  var uglify = $.if(PRODUCTION, $.uglify()
    .on('error', function (e) {
      console.log(e);
    }));

  return gulp.src(PATHS.javascript)
    .pipe($.sourcemaps.init())
    .pipe($.babel( {
      presets: ['es2015']
    }))
    .pipe($.concat('main.js'))
    .pipe(uglify)
    .pipe($.if(!PRODUCTION, $.sourcemaps.write()))
    .pipe(gulp.dest('js'));
});

// copy files into a new dir
gulp.task('copy', () => gulp
  .src('bower_components/popper.js/dist/popper.min.js')
  .pipe(gulp.dest('../js'))
);

gulp.task('copyJS', () => gulp
  .src(PATHS.javascriptVerdors)
  // .src([
  //   PATHS.javascript
  // ])
  .pipe(gulp.dest('./js/vendor'))
);

// copy css from vendors
gulp.task('copyCSS', () => gulp
  // .src('bower_components/normalize-css/.travis.yml')
  .src(PATHS.css)
  // .src([
  //   PATHS.css,
  // ])
  .pipe(gulp.dest('./assets/css/vendor'))
);

// Compile Sass into CSS. In production, the CSS is compressed
gulp.task('sass', function() {

  // return gulp.src('src/sass/styles.scss')
  return gulp.src('src/sass/main.scss')
    .pipe($.sourcemaps.init())
    .pipe($.sass({
      includePaths: PATHS.sass
    })
      .on('error', $.sass.logError))
    .pipe($.autoprefixer({
      browsers: COMPATIBILITY
    }))
    .pipe($.if(PRODUCTION, $.cssnano()))
    .pipe($.if(!PRODUCTION, $.sourcemaps.write()))
    .pipe(gulp.dest('css'));
});

//faq sass
gulp.task('sass-faq', function() {

  return gulp.src('faq/scss/style.scss')
    .pipe($.sourcemaps.init())
    .pipe($.sass({
      includePaths: [PATHS.sass, bourbon]
    })
      .on('error', $.sass.logError))
    .pipe($.autoprefixer({
      browsers: COMPATIBILITY
    }))
    .pipe($.if(PRODUCTION, $.cssnano()))
    .pipe($.if(!PRODUCTION, $.sourcemaps.write()))
    .pipe(gulp.dest('faq/css'));
});

// Build the "dist" folder by running all of the above tasks
gulp.task('build', ['javascript','sass']);
gulp.task('build-faq', ['sass-faq']);
// gulp.task('build', ['javascript', 'sass']);
// gulp.task('build2', ['copy', 'sass']);

gulp.task('faq', ['sass-faq'], function() {
  gulp.watch(['faq/scss/**/*.scss'], ['sass-faq']);
});


gulp.task('default', ['copyJS','javascript','sass'], function() {
  gulp.watch(['src/sass/**/*.scss'], ['sass']);
  gulp.watch(['src/js/**/*.js'], ['javascript']);
});

package.json

{
  "name": "foundation-sites-template",
  "version": "1.0.0",
  "description": "Basic template for a new Bolt theme based on Zurb Foundation for Sites project.",
  "main": "gulpfile.js",
  "scripts": {
    "start": "gulp",
    "build": "gulp build --production",
    "faq": "gulp faq",
    "build-faq": "gulp build-faq --production",
    "postinstall": "bower install"
  },
  "author": "ar-to",
  "license": "MIT",
  "private": false,
  "engineStrict": true,
  "engines": {
    "node": ">5.8",
    "npm": ">3.7"
  },
  "dependencies": {
    "babel-preset-es2015": "^6.24.1",
    "bourbon": "^5.0.0",
    "bower": "^1.8.0",
    "gulp": "^3.9.1",
    "gulp-autoprefixer": "^4.0.0",
    "gulp-babel": "^6.1.2",
    "gulp-concat": "^2.6.1",
    "gulp-cssnano": "^2.1.2",
    "gulp-if": "^2.0.2",
    "gulp-load-plugins": "^1.5.0",
    "gulp-sass": "^3.1.0",
    "gulp-sourcemaps": "^2.6.0",
    "gulp-uglify": "^3.0.0",
    "js-yaml": "^3.9.0",
    "yargs": "^8.0.2"
  }
}