gulpfile.js

var gulp = require('gulp');
var less = require('gulp-less');
var browserSync = require('browser-sync').create();
var header = require('gulp-header');
var cleanCSS = require('gulp-clean-css');
var rename = require("gulp-rename");
var uglify = require('gulp-uglify');
var pkg = require('./package.json');
var webpack = require("webpack");
var WebpackDevServer = require("webpack-dev-server");
var webpackConfig = require('./webpack.config.js');

// Set the banner content
var banner = ['/*!\n',
    ' * Start Bootstrap - <%= pkg.title %> v<%= pkg.version %> (<%= pkg.homepage %>)\n',
    ' * Copyright 2013-' + (new Date()).getFullYear(), ' <%= pkg.author %>\n',
    ' * Licensed under <%= pkg.license.type %> (<%= pkg.license.url %>)\n',
    ' */\n',
    ''
].join('');

// Compile LESS files from /less into /css
gulp.task('less', function() {
    return gulp.src('less/grayscale.less')
        .pipe(less())
        .pipe(header(banner, { pkg: pkg }))
        .pipe(gulp.dest('css'))
        .pipe(browserSync.reload({
            stream: true
        }))
});

// Minify compiled CSS
gulp.task('minify-css', ['less'], function() {
    return gulp.src('css/grayscale.css')
        .pipe(cleanCSS({ compatibility: 'ie8' }))
        .pipe(rename({ suffix: '.min' }))
        .pipe(gulp.dest('css'))
        .pipe(browserSync.reload({
            stream: true
        }))
});

// Minify JS
gulp.task('minify-js', function() {
    return gulp.src('js/grayscale.js')
        .pipe(uglify())
        .pipe(header(banner, { pkg: pkg }))
        .pipe(rename({ suffix: '.min' }))
        .pipe(gulp.dest('js'))
        .pipe(browserSync.reload({
            stream: true
        }))
});

// Copy vendor libraries from /node_modules into /vendor
gulp.task('copy', function() {
    gulp.src(['node_modules/bootstrap/dist/**/*', '!**/npm.js', '!**/bootstrap-theme.*', '!**/*.map'])
        .pipe(gulp.dest('vendor/bootstrap'))

    gulp.src(['node_modules/jquery/dist/jquery.js', 'node_modules/jquery/dist/jquery.min.js'])
        .pipe(gulp.dest('vendor/jquery'))

    gulp.src([
            'node_modules/font-awesome/**',
            '!node_modules/font-awesome/**/*.map',
            '!node_modules/font-awesome/.npmignore',
            '!node_modules/font-awesome/*.txt',
            '!node_modules/font-awesome/*.md',
            '!node_modules/font-awesome/*.json'
        ])
        .pipe(gulp.dest('vendor/font-awesome'))
})

// Run everything
gulp.task('default', ['less', 'minify-css', 'minify-js', 'copy']);

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

// Dev task with browserSync
gulp.task('dev', ['browserSync', 'less', 'minify-css', 'minify-js'], function() {
    gulp.watch('less/*.less', ['less']);
    gulp.watch('css/*.css', ['minify-css']);
    gulp.watch('js/*.js', ['minify-js']);
    // Reloads the browser whenever HTML or JS files change
    gulp.watch('*.html', browserSync.reload);
    gulp.watch('js/**/*.js', browserSync.reload);
});

// ~~~~~~~~~~~~~~~~~~~~~~~

// The development server (the recommended option for development)
gulp.task("default", ["webpack-dev-server"]);

// Build and watch cycle (another option for development)
// Advantage: No server required, can run app from filesystem
// Disadvantage: Requests are not blocked until bundle is available,
//               can serve an old app on refresh
gulp.task("build-dev", ["webpack:build-dev"], function() {
	gulp.watch(["app/**/*"], ["webpack:build-dev"]);
});

// Production build
gulp.task("build", ["webpack:build"]);

gulp.task("webpack:build", function(callback) {
	// modify some webpack config options
	var myConfig = Object.create(webpackConfig);
	myConfig.plugins = myConfig.plugins.concat(
		new webpack.DefinePlugin({
			"process.env": {
				// This has effect on the react lib size
				"NODE_ENV": JSON.stringify("production")
			}
		}),
		new webpack.optimize.DedupePlugin(),
		new webpack.optimize.UglifyJsPlugin()
	);

	// run webpack
	webpack(myConfig, function(err, stats) {
		if(err) throw new gutil.PluginError("webpack:build", err);
		gutil.log("[webpack:build]", stats.toString({
			colors: true
		}));
		callback();
	});
});

// modify some webpack config options
var myDevConfig = Object.create(webpackConfig);
myDevConfig.devtool = "sourcemap";
myDevConfig.debug = true;

// create a single instance of the compiler to allow caching
var devCompiler = webpack(myDevConfig);

gulp.task("webpack:build-dev", function(callback) {
	// run webpack
	devCompiler.run(function(err, stats) {
		if(err) throw new gutil.PluginError("webpack:build-dev", err);
		gutil.log("[webpack:build-dev]", stats.toString({
			colors: true
		}));
		callback();
	});
});

gulp.task("webpack-dev-server", function(callback) {
	// modify some webpack config options
	var myConfig = Object.create(webpackConfig);
	myConfig.devtool = "eval";
	myConfig.debug = true;

	// Start a webpack-dev-server
	new WebpackDevServer(webpack(myConfig), {
		publicPath: "/" + myConfig.output.publicPath,
		stats: {
			colors: true
		}
	}).listen(3000, "localhost", function(err) {
		if(err) throw new gutil.PluginError("webpack-dev-server", err);
		gutil.log("[webpack-dev-server]", "http://localhost:3000/webpack-dev-server/index.html");
	});
});