gulpfile.babel.js
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	'use strict';

	import plugins from 'gulp-load-plugins';
	import yargs from 'yargs';
	import browser from 'browser-sync';
	import gulp from 'gulp';
	import panini from 'panini';
	import rimraf from 'rimraf';
	import sherpa from 'style-sherpa';
	import yaml from 'js-yaml';
	import fs from 'fs';
	import webpackStream from 'webpack-stream';
	import webpack2 from 'webpack';
	import named from 'vinyl-named';

	// Load all Gulp plugins into one variable
	const $ = plugins();

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

	// Load settings from settings.yml
	const { COMPATIBILITY, PORT, UNCSS_OPTIONS, PATHS } = loadConfig();

	function loadConfig() {
	let ymlFile = fs.readFileSync('config.yml', 'utf8');
	return yaml.load(ymlFile);
	}

	// Build the "dist" folder by running all of the below tasks
	gulp.task('build',
	gulp.series(clean, gulp.parallel(pages, sass, javascript, images, copy)));

	// Build the site, run the server, and watch for file changes
	gulp.task('default',
	gulp.series('build', server, watch));

	// Delete the "dist" folder
	// This happens every time a build starts
	function clean(done) {
	rimraf(PATHS.dist, done);
	}

	// Copy files out of the assets folder
	// This task skips over the "img", "js", and "scss" folders, which are parsed separately
	function copy() {
	return gulp.src(PATHS.assets)
	.pipe(gulp.dest(PATHS.dist + '/assets'));
	}

	// Copy page templates into finished HTML files
	function pages() {
	return gulp.src('src/pages/*/.{html,hbs,handlebars}')
	.pipe(panini({
	root: 'src/pages/',
	layouts: 'src/layouts/',
	partials: 'src/partials/',
	data: 'src/data/',
	helpers: 'src/helpers/'
	}))
	.pipe(gulp.dest(PATHS.dist));
	}

	// Load updated HTML templates and partials into Panini
	function resetPages(done) {
	panini.refresh();
	done();
	}

	// Compile Sass into CSS
	// In production, the CSS is compressed
	function sass() {
	return gulp.src('src/assets/scss/app.scss')
	.pipe($.sourcemaps.init())
	.pipe($.sass({
	includePaths: PATHS.sass
	})
	.on('error', $.sass.logError))
	.pipe($.autoprefixer({
	browsers: COMPATIBILITY
	}))
	// Comment in the pipe below to run UnCSS in production
	//.pipe($.if(PRODUCTION, $.uncss(UNCSS_OPTIONS)))
	.pipe($.if(PRODUCTION, $.cleanCss({ compatibility: 'ie9' })))
	.pipe($.if(!PRODUCTION, $.sourcemaps.write()))
	.pipe(gulp.dest(PATHS.dist + '/assets/css'))
	.pipe(browser.reload({ stream: true }));
	}

	let webpackConfig = {
	module: {
	rules: [
	{
	test: /.js$/,
	use: [
	{
	loader: 'babel-loader'
	}
	]
	}
	]
	}
	}
	// Combine JavaScript into one file
	// In production, the file is minified
	function javascript() {
	return gulp.src(PATHS.entries)
	.pipe(named())
	.pipe($.sourcemaps.init())
	.pipe(webpackStream(webpackConfig, webpack2))
	.pipe($.if(PRODUCTION, $.uglify()
	.on('error', e => { console.log(e); })
	))
	.pipe($.if(!PRODUCTION, $.sourcemaps.write()))
	.pipe(gulp.dest(PATHS.dist + '/assets/js'));
	}

	// Copy images to the "dist" folder
	// In production, the images are compressed
	function images() {
	return gulp.src('src/assets/img/*/')
	.pipe($.if(PRODUCTION, $.imagemin({
	progressive: true
	})))
	.pipe(gulp.dest(PATHS.dist + '/assets/img'));
	}

	// Start a server with BrowserSync to preview the site in
	function server(done) {
	browser.init({
	server: PATHS.dist, port: PORT
	});
	done();
	}

	// Reload the browser with BrowserSync
	function reload(done) {
	browser.reload();
	done();
	}

	// Watch for changes to static assets, pages, Sass, and JavaScript
	function watch() {
	gulp.watch(PATHS.assets, copy);
	gulp.watch('src/pages/*/.html').on('all', gulp.series(pages, browser.reload));
	gulp.watch('src/{layouts,partials}/*/.html').on('all', gulp.series(resetPages, pages, browser.reload));
	gulp.watch('src/assets/scss/*/.scss').on('all', sass);
	gulp.watch('src/assets/js/*/.js').on('all', gulp.series(javascript, browser.reload));
	gulp.watch('src/assets/img/*/').on('all', gulp.series(images, browser.reload));
	}

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