Expected behavior

There should be no console errors after complitaion

Actual behavior

I get the error:

Uncaught TypeError: Cannot set properties of undefined (setting 'Calendar')
at all.min.js:1:16
at ./node_modules/mdb-ui-kit/plugins/js/all.min.js (all.min.js:1:208)
at __webpack_require__ (bootstrap:19:1)
at ./assets/js/mdb/plugins.js (mdb.js:2:17)
at __webpack_require__ (bootstrap:19:1)
at ./assets/js/admin/_adminMain.js (adminMain.js:61:74)
at __webpack_require__ (bootstrap:19:1)
at __webpack_exec__ (multi-select.css:1:1)
at multi-select.css:1:1
at __webpack_require__.O (chunk loaded:23:1)

Resources (screenshots, code snippets etc.)

assets/js/mdb/mdb.js:

import * as mdb from 'mdb-ui-kit/js/mdb.umd.min.js';
window.mdb = mdb;

assets/js/mdb/plugins.js:

import * as plugins from 'mdb-ui-kit/plugins/js/all.min.js'; // lib
window.plugins = plugins;

And in my assets/js/admin/_adminMain.js I have added it like this:

// MDB
import '../mdb/mdb.js';
import '../mdb/plugins.js';

When I do yarn encore dev Everthing is okay, and build is scucessful but I get that error in frontend. What I am doing wrong here? Thanks.

Edit

I am using webpack to compile my assets:

This is my webpack.config.js file:

    var Encore = require('@symfony/webpack-encore');

    if (!Encore.isRuntimeEnvironmentConfigured()) {
        Encore.configureRuntimeEnvironment(process.env.NODE_ENV || 'dev');
    }

    Encore
        // public path used by the web server to access the output path
        .setPublicPath('/build')
        // clean output path before each build
        .cleanupOutputBeforeBuild()
        // auto import jQuery & Provide variables
        .autoProvidejQuery()
        // enable sass/scss parser
        .enableSassLoader()
        // enable build notifications
        .enableBuildNotifications()
        // enable source maps during development
        .enableSourceMaps(!Encore.isProduction())
        // enable versioning
        .enableVersioning(Encore.isProduction())

        // add entry points for js & css files for templates/Admin/shopAdmin.html.twig
        .addEntry('js/adminMain', './assets/js/admin/_adminMain.js')
        .addStyleEntry('css/adminMain', './assets/scss/admin/_adminMain.scss')   

        // split entry chunks 
        .splitEntryChunks()
        // enable single runtime chunk
        .enableSingleRuntimeChunk()
        // enable babel
        .configureBabel(() => {}, {
            useBuiltIns: 'usage',
            corejs: 3
        })

    ;

    // export the final configuration
    module.exports = Encore.getWebpackConfig();