Syntax Error: Unexpected token 'function'?

Question

gulp.js

History:
I did the gulp setup according to the video lesson. At first everything worked fine, but as I got to the installation of the "imagemin" plugin, problems arose. As I understand it, there were some problems with the fact that new versions of node.js use the ES6 standard, which is why the plugin will not work. I couldn't solve this problem, so I figured I'd do without "imagemin". I remove it, run gulp, and it doesn't work! That's the way things are! I'm reinstalling my Mac OS system. Now I reinstalled everything according to the video tutorials. And now "browsersync" doesn't work. Class.
My code

let project_folder = "dist";
let source_folder = "#src";

let path = {
  build: {
    html: project_folder + "/",
    css: project_folder + "/css/",
    js: project_folder + "/js/",
    img: project_folder + "/img/",
    fonts: project_folder + "/fonts/",
  },
  src: {
    html: [source_folder + "/*.html", "!" + source_folder + "/_*.html"],
    css: source_folder + "/scss/style.scss",
    js: source_folder + "/js/script.js",
    img: source_folder + "/img/**/*.{jpg,png,svg,gif,ico,webp}",
    fonts: source_folder + "/fonts/*.ttf",
  },
  watch: {
    html: source_folder + "/**/*.html",
    css: source_folder + "/scss/**/*.scss",
    js: source_folder + "/js/**/*.js",
    img: source_folder + "/img/**/*.{jpg,png,svg,gif,ico,webp}",
  },
  clean: "./" + project_folder + "/"
}

let { src, dest } = require('gulp'),
  gulp = require('gulp'),
  browsersync = require("browser-sync").create(),
  fileinclude = require("gulp-file-include"),
  del = require("del"),
  scss = require('gulp-sass')(require('sass')),
  autoprefixer = require("gulp-autoprefixer"),
  group_media = require("gulp-group-css-media-queries"),
  clean_css = require("gulp-clean-css"),
  rename = require("gulp-rename"),
  uglify = require("gulp-uglify-es").default;

function browserSync(params) {
  browsersync.init({
    server: {
      baseDir: "./" + project_folder + "/"
    },
    port: 3000,
    notify: false
  })
}

function html() {
  return src(path.src.html)
    .pipe(fileinclude())
    .pipe(dest(path.build.html))
    .pipe(browsersync.stream())
}

function css() {
  return src(path.src.css)
    .pipe(
      scss({
        outputStyle: "expanded"
      }).on('error', scss.logError)
    )
    .pipe(
      group_media()
    )
    .pipe(
      autoprefixer({
        overrideBrowserslist: ["last 5 versions"],
        cascade: true
      })
    )
    .pipe(dest(path.build.css))
    .pipe(clean_css())
    .pipe(
      rename({
        extname: ".min.css"
      })
    )
    .pipe(dest(path.build.css))
    .pipe(browsersync.stream())
}

function js() {
  return src(path.src.js)
    .pipe(fileinclude())
    .pipe(dest(path.build.js))
    .pipe(
      uglify()
    )
    .pipe(
      rename({
        extname: ".min.js"
      })
    )
    .pipe(dest(path.build.js))
    .pipe(browsersync.stream())
}

function watchFiles(params) {
  gulp.watch([path.watch.html], html);
  gulp.watch([path.watch.css], css);
  gulp.watch([path.watch.js], js);
}

function clean(params) {
  return del(path.clean);
}

let build = gulp.series(clean, gulp.parallel(js, css, html));
let watch = gulp.parallel(build, watchFiles, browserSync);

exports.css = js;
exports.css = css;
exports.html = html;
exports.build = build;
exports.watch = watch;
exports.default = watch;

The compiler complains about line 40.

Compiler

Answer 1

Cannot find module 'sass'