CodeAbode/gulpfile.js

// based on https://gist.github.com/torgeir/8507130

// Load plugins
let gulp = require("gulp"),
  autoprefixer = require("gulp-autoprefixer"),
  csso = require("gulp-csso"),
  uglify = require("gulp-uglify"),
  htmlmin = require("gulp-html-minimizer"),
  clean = require("gulp-clean"),
  purgecss = require("gulp-purgecss"),
  connect = require("gulp-connect");

// Styles
gulp.task("styles", function () {
  return gulp
    .src("./css/*.css")
    .pipe(
      purgecss({
        content: ["index.html", "js/*.js"],
      })
    )
    .pipe(autoprefixer())
    .pipe(csso())
    .pipe(gulp.dest("./dist/css"))
    .pipe(connect.reload());
});

// Scripts
gulp.task("scripts", function () {
  return gulp
    .src("./js/*.js")
    .pipe(uglify())
    .pipe(gulp.dest("./dist/js"))
    .pipe(connect.reload());
});

// Images
gulp.task("images", function () {
  return gulp
    .src(["./images/**/*"], { removeBOM: false })
    .pipe(gulp.dest("./dist/images"))
    .pipe(connect.reload());
});

// Fonts
gulp.task("fonts", function () {
  return gulp
    .src(["./fonts/**/*"], { removeBOM: false })
    .pipe(gulp.dest("./dist/fonts"))
    .pipe(connect.reload());
});

// Other useless content
gulp.task("other", function () {
  return gulp
    .src(["./other/**/*"], { removeBOM: false })
    .pipe(gulp.dest("./dist/other"))
    .pipe(connect.reload());
});

gulp.task("html", function () {
  return gulp
    .src("./*.html")
    .pipe(
      htmlmin({
        collapseWhitespace: true,
        removeComments: true,
        minifyCSS: true,
        minifyJS: true,
        removeAttributeQuotes: true,
        removeRedundantAttributes: true,
        removeOptionalTags: true,
        removeStyleLinkTypeAttributes: true,
        removeScriptTypeAttributes: true,
      })
    )
    .pipe(gulp.dest("./dist"))
    .pipe(connect.reload());
});

// Clean
gulp.task("clean", function () {
  return gulp
    .src(["dist/css", "dist/js", "dist/images", "dist/*.html", "dist/fonts"], {
      read: false,
      allowEmpty: true,
    })
    .pipe(clean());
});

// Default task
gulp.task(
  "default",
  gulp.series("clean", async function minifyAll() {
    return gulp.parallel(
      "styles",
      "scripts",
      "images",
      "html",
      "fonts",
      "other"
    )();
  })
);

// Connect server
gulp.task("connect", function () {
  // Listen on port 8080
  connect.server({
    root: "dist",
    port: 8080,
    livereload: true,
  });
});

// Watch
gulp.task("watch", function () {
  gulp.watch("./css/*.css", gulp.series("styles"));
  gulp.watch("./js/*.js", gulp.series("scripts"));
  gulp.watch("./images/**/*", gulp.series("images"));
  gulp.watch("./*.html", gulp.series("html"));
  gulp.watch("./fonts/**/*", gulp.series("fonts"));
  gulp.watch("./other/**/*", gulp.series("other"));
});

gulp.task("dev", gulp.series("default", gulp.parallel("connect", "watch")));