gulpfile.js

const gulp = require('gulp'),
    concat = require('gulp-concat'),
    pug = require('gulp-pug'),
    cleanCss = require('gulp-clean-css'),
    uglify = require('gulp-uglify'),
    environments = require('gulp-environments'),
    development = environments.development,
    production = environments.production;

let paths = {
    scripts: [
        'node_modules/jquery/dist/jquery.js',
        production() ? 'node_modules/jquery-migrate/dist/jquery-migrate.min.js' : 'node_modules/jquery-migrate/dist/jquery-migrate.js',
        'node_modules/bootstrap/dist/js/bootstrap.js',
        'node_modules/jquery.easing/jquery.easing.js',
        "node_modules/fittext.js/jquery.fittext.js",
        'node_modules/flexslider/jquery.flexslider.js',
        "node_modules/jquery-waypoints/waypoints.js",
        "*js/libs/jquery.scrollto.js",
        "*js/libs/jquery.masonry.js",
        "*js/libs/jquery.label_better.js",
        "*js/contact.js",
        "*js/meflat.js"
    ],
    styles: [
        'node_modules/bootstrap/dist/css/bootstrap.min.css',
        'node_modules/font-awesome/css/font-awesome.css',
        'node_modules/flexslider/flexslider.css',
        '*css/meflat-light-green.css',
        '*css/overrides.css'
    ],
    pug: [
        'pug/index.pug'
    ],
    extras: [
        '_redirects',
        'node_modules/font-awesome/*fonts/*',
        'assets/imac.png',
        'assets/loader.gif',
        'assets/placeholder-450x270.jpg',
        'assets/robots.txt',
        'assets/sitemap.xml',
        'js/libs/modernizr.min.js'
    ],
    dist: './dist/'
};

if (production()) {
    paths.extras.push('assets/.htaccess');
}

const config = {
    gravatar: "https://gravatar.com/avatar/18272084a145b66c6b118b38a2fe7c23",
    ga: {
        enabled: production(),
        code: "GTM-5BL7MZZ"
    }
};

gulp.task('scripts', function() {
    'use strict';

    return gulp.src(paths.scripts)
        .pipe(concat('app.min.js'))
        .pipe(production(uglify()))
        .pipe(gulp.dest(paths.dist));
});

gulp.task('styles', function() {
    'use strict';

    return gulp.src(paths.styles)
        .pipe(concat('app.min.css'))
        .pipe(production(cleanCss()))
        .pipe(gulp.dest(paths.dist));
});

gulp.task('pug', function() {
    'use strict';

    return gulp.src(paths.pug)
        .pipe(pug({
            pretty: development(),
            locals: config
        }))
        .pipe(gulp.dest(paths.dist));
})

gulp.task('copy', function() {
    'use strict';

    return gulp.src(paths.extras)
        .pipe(gulp.dest(paths.dist));
});

gulp.task('default', gulp.series(['copy', 'scripts', 'styles', 'pug']));