How do you integrate a template correctly?

To all of you who are a bit further along. I'm starting to despair. Am I just too stupid?

I want to integrate a sidebar navigation into a PWA app based on the MDB Bootstrap template. mdbootstrap.com

Here is an example of how it works properly with pure HTML.
Web

If I now try to integrate the template into a PWA app, the JavaScript no longer seems to be handled correctly. An error is thrown and the page no longer works properly. Here is the example

TMS Web Project

If anyone wants to help, here is the repository with all the code.

landrix/TMSWebCore

Thanks, Sven

What I see is:

  1. Code
        const sidenavInstance = mdb.Sidenav.getInstance(sidenav);
fails, because it is trying to run it before lib

<script type="text/javascript" src="https://test.landrix.de/assets/js/mdb.umd.min.js"></script>

is loaded.
So, start with moving this lib reference to project.html

  1. Next I see that

const sidenavInstance = mdb.Sidenav.getInstance(sidenav);

returns a null. Not sure why this is happening. This is something in the mdb library but as I'm not an expert in this library, I'm not sure what is causing this and could not allocate sufficient time to investigate this deeper.

i changed the javascript part from UMD to ES. Whatever this means

Bootstrap Sidenav - examples & tutorial

Now it "works", but TMSWebCore raise an exception

Project1.html:3 Uncaught SyntaxError: Cannot use import statement outside a module
at nodeScriptReplace (WEBLib.Forms.pas:3266:1)
at nodeScriptReplace (WEBLib.Forms.pas:3272:1)
at Object.ActivateChildScripts (WEBLib.Forms.pas:3290:1)
at DoStatusCreate (WEBLib.Forms.pas:3223:7)
at XMLHttpRequest.cb (rtl.js:281:1)

procedure TApplication.ActivateChildScripts(AElement: TJSHTMLElement);
begin
// activate possible child scripts
asm
function nodeScriptReplace(node) {
if ( nodeScriptIs(node) === true ) {
node.parentNode.replaceChild( nodeScriptClone(node) , node );
}

what does it mean

i have updated all parts

https://test.landrix.de/tmswebcore/tms/Project1.html

Try to change

<script src="https://test.landrix.de/assets/js/mdb.umd.min.js" type="text/javascript"></script>

to

<script type="module" src="https://test.landrix.de/assets/js/mdb.umd.min.js" type="text/javascript"></script>