How to fix errors in gulp?

Question

gulp.js

please tell me how to solve...

[Browsersync] Serving files from: app/
[Browsersync] Reloading Browsers... (buffered 2 events)

const { src, dest, watch, parallel } = require('gulp');

const scss = require('gulp-sass');
const concat = require('gulp-concat');
const autoprefixer = require('gulp-autoprefixer');
const uglify = require('gulp-uglify');
const browserSync = require('browser-sync').create();
const imagemin = require('gulp-imagemin');



function browsersync() {
    browserSync.init({
        server: {
            baseDir: 'app/'
        }
    })
}

function styles() {
    return src('app/scss/style.scss')
        .pipe(scss({ outputStyle: 'compressed' }))
        .pipe(concat('style.min.css'))
        .pipe(autoprefixer({
            overrideBrowserslist: ['last 10 versions'],
            grid: true
        }))
        .pipe(dest('app/css'))
        .pipe(browserSync.stream())
}

function images() {
    return src('app/images/**/*.*')
        .pipe(imagemin([
            imagemin.gifsicle({ interlaced: true }),
            imagemin.mozjpeg({ quality: 75, progressive: true }),
            imagemin.optipng({ optimizationLevel: 5 }),
            imagemin.svgo({
                plugins: [
                    { removeViewBox: true },
                    { cleanupIDs: false }
                ]
            })
        ]))
        .pipe(dest('dist/images'))
}

function scripts() {
    return src([
        'node_modules/jquery/dist/jquery.js',
        'app/js/main.js'
    ])
        .pipe(concat('main.min.js'))
        .pipe(uglify())
        .pipe(dest('app/js'))
        .pipe(browserSync.stream())
}

function watching() {
    watch(['app/scss/**/*.scss'], styles);
    watch(['app/js/**/*.js', '!app/js/main.min.js'], scripts);
    watch(['app/*.html'], done => {
        browserSync.reload();
        done();
    });

}

exports.styles = styles;
exports.scripts = scripts;
exports.browsersync = browsersync;
exports.watching = watching;
exports.images = images;
exports.default = parallel(styles, scripts, browsersync, watching);