It honestly depends on how much your LSP server infests the editor. In the language server I wrote there are really 2 cases where we utilize the creation of an

It honestly depends on how much your LSP server infests the editor. In the language server I wrote there are really 2 cases where we utilize the creation of an editor-specific extension * dynamic registration of file extensions * display of svg generated by the language server. We also had to write ad-hoc custom vim-script and would need to do the same for emacs for the first of those, and just dump a URL for vim to punt to a browser for the latter. But it isn't unrealistic to require a custom editor scripts for other editors besides vscode, in the sense that I've done so...