Настройка browserSync + Sass для Gulp 4

const { src, dest, parallel, watch, series } = require('gulp'); 
const sass = require('gulp-sass'); 
const browserSync = require('browser-sync').create(); 
 
 
function browser() { 
    browserSync.init({ 
        server: { 
            baseDir: "src" 
        }, 
        notify: false, 
    }) 
} 
 
function watchFiles() { 
    watch("src/sass/**/*.scss", css); 
    watch("src/*.html").on('change', browserSync.reload); 
} 
 
function css() { 
    return src("src/sass/**/*.scss") 
        .pipe(sass()) 
        .pipe(dest("src/css")) 
        .pipe(browserSync.stream()); 
} 
 
exports.css = css; 
exports.default = series( 
    series(css),  
    parallel(browser, watchFiles) 
);