Uncaught ReferenceError: $ is not defined - Laravel 5.5

Hi,

I recently check out my project from SVN. I ran into "Uncaught ReferenceError: $ is not defined" where ever I have used "$" ie; Jquery. I am using laravel mixer to combine the JS and CSS Files.

This is my bootstrap.js file

window._ = require('lodash');
window.Popper = require('popper.js').default;
window.tooltip = require('tooltip.js');

/**
 * We'll load jQuery and the Bootstrap jQuery plugin which provides support
 * for JavaScript based Bootstrap features such as modals and tabs. This
 * code may be modified to fit the specific needs of your application.
 */

try {
    window.$ = window.jQuery = require('jquery');
    require('jquery-ui-dist/jquery-ui.min.js');
    require('bootstrap');
} catch (e) {}

/**
 * We'll load the axios HTTP library which allows us to easily issue requests
 * to our Laravel back-end. This library automatically handles sending the
 * CSRF token as a header based on the value of the "XSRF" token cookie.
 */

window.axios = require('axios');

window.axios.defaults.headers.common['X-Requested-With'] = 'XMLHttpRequest';

/**
 * Next we will register the CSRF Token as a common header with Axios so that
 * all outgoing HTTP requests automatically have it attached. This is just
 * a simple convenience so we don't have to attach every token manually.
 */

let token = document.head.querySelector('meta[name="csrf-token"]');

if (token) {
    window.axios.defaults.headers.common['X-CSRF-TOKEN'] = token.content;
} else {
    console.error('CSRF token not found: https://laravel.com/docs/csrf#csrf-x-csrf-token');
}

/**
 * Echo exposes an expressive API for subscribing to channels and listening
 * for events that are broadcast by Laravel. Echo and event broadcasting
 * allows your team to easily build robust real-time web applications.
 */

// import Echo from 'laravel-echo'

// window.Pusher = require('pusher-js');

// window.Echo = new Echo({
//     broadcaster: 'pusher',
//     key: 'your-pusher-key'
// });
//Moment JS
window.moment = require('moment');
//Collect JS
window.collect = require('collect.js');
//Clipboard JS
window.ClipboardJS = require('clipboard');
//Import Toster
window.toastr = require('toastr');
//Swaet Alert
import Swal from 'sweetalert2';

window.swal = Swal;
//Owl Carousel
window.owlCarousel =  require('owl.carousel');
//JS Cookie
window.Cookies = require('js-cookie');
//Image Zoom
require('ez-plus');

This is my Webpack.mix.js

let mix = require('laravel-mix');

/*
 |--------------------------------------------------------------------------
 | Mix Asset Management
 |--------------------------------------------------------------------------
 |
 | Mix provides a clean, fluent API for defining some Webpack build steps
 | for your Laravel application. By default, we are compiling the Sass
 | file for the application as well as bundling up all the JS files.
 |
 */

mix.js('resources/assets/js/app.js', 'public/js').sourceMaps()
   .sass('resources/assets/sass/app.scss', 'public/css');

//
mix.copy('node_modules/jquery-slimscroll/jquery.slimscroll.min.js', 'public/js/jquery.slimscroll.min.js');   

//Main Libraries Styles

mix.styles([
    'public/css/pignose.calendar.min.css',
    'public/css/magnific-popup.css',
    'public/css/select2.min.css'
], 'public/css/main_libraries.css');

//Main Custom Styles

mix.styles([
    'public/css/developer.css',
    'public/css/style.css'
], 'public/css/main_custom.css');

//Inner Page Styles
mix.styles([
    'public/css/social.css',
    'public/css/myprof.css',
    'public/css/onsenui.css',
    'public/css/inner_style.css',
    'public/css/loader.css'
    
], 'public/css/inner.css');


//Main Library Scripts
mix.scripts([
    'public/js/jquery.ui.touch-punch.min.js',
    'public/js/jquery.slimscroll.min.js',
    'public/js/jquery.nicescroll.js',
    'public/js/jquery.magnific-popup.min.js',
    'public/js/pignose.calendar.full.min.js',
    'public/js/select2.min.js'
    
], 'public/js/main_libraries.js');

//Main Custom Scripts
mix.babel([
    'public/js/custom-scripts.js',
    'public/js/custom.js',
    'js/search-results.js',
], 'public/js/main_custom.js');

//Basket Scripts
mix.babel([
    'public/js/pages/basket.js',
    'public/js/pages/basket_transitions.js',
    'public/js/pages/basket-address.js',
    'public/js/pages/reminder.js'

], 'public/js/pages/basket_operations.js');

Laravel Version : 5.5 Mix Version : 1.7.2