The linked CodeSandbox examples don't run. I get
Cannot read property 'replaceWith' of null
It seems that a differnt index.html is used in the sandbox. Hence, the target element #app to mount to is not found
#app
let $rootEl = mount($app, document.getElementById('app'));
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The linked CodeSandbox examples don't run. I get
It seems that a differnt index.html is used in the sandbox. Hence, the target element
#appto mount to is not found