Are there looser typescript Dom definitons or settings?

Question

I would like less correct types for the Document interface. Basically everything is of type Element when its always HTMLElement that I want. Littering lines like (document.activeElement.previousElementSibling as HTMLElement).click(); with as assertions/casts is not making my code any cleaner and creates a lot of friction transitioning from js to ts. Would be great if everything in the Document interface dealt with HTMLElement or something like Element & Partial<HTMLElement>.

I tried seeing if Declaration Merging would let some variation like interface Document { getElementsByClassName (classNames: string): HTMLCollectionOf<HTMLElement>;} to work but it didn't seem like this is the right track.

It looks like typescript 4.5 lets you specify specific lib-dom versions. Is it reasonable or possible to create a user modified lib-dom and target that? (Announcement) (Docs)

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Currently using but have no requirements on tsc 4.6.4 and

  "compilerOptions": {
    "target": "ES2021",
    "lib": [
      "dom",
      "dom.iterable",
      "esnext"
    ],
    "jsx": "react-jsx",}