Make sure the links are added before initialization.
<script src="{{ asset('assets/jquery/jquery-3.7.1.min.js') }}"></script>
<script src="https://cdn.ckeditor.com/ckeditor5/41.1.0/classic/ckeditor.js"></script>
<script src="{{ asset('assets/admin_js/script.js') }}"></script>
$(document).ready(function() {
let theEditor;
ClassicEditor.create( document.querySelector( '#bookDesc' ),
{
toolbar: ['heading', '|', 'bold', 'italic', 'link', 'bulletedList', 'numberedList', 'blockQuote','|',
'undo', 'redo',]
})
.then(editor => {
theEditor = editor;
})
.catch( error => {
console.error( error );
});
});