code: function watchFiles(done) {
    gulp.watch(['./**/*.scss', 'dist/index.html'], () => {
      return gulp
        .src('./*.scss')
        .pipe(plumber())
        .pipe(
          sass({
            includePaths: ['node_modules']
          }).on('error', sass.logError)
        )
        .pipe(gulp.dest(paths.css))
        .pipe(
          autoprefixer({
            browsers: ['last 3 versions'],
            cascade: false
          })
        )
        .pipe(gulp.dest(paths.css))
        .pipe(cleanCSS({ debug: true }))
        .pipe(gulp.dest(paths.css))
        .pipe(browserSyncReload(done));
    });
  }
docs: Watch files