Private class fields are finally coming to JavaScript with no less than three separate TC39 proposals that define the new capabilities.

Instantiating Blazor Classes If you have a class in your Blazor code and want to call a method on an instantiated version of it from JavaScript code, you can. The problem is, however, that you can't ...

Although the TextEdit element is still using those classes under the hood, they aren't accessible. Instead, you get simple JavaScript wrapper methods that are a lot less functional and powerful.