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It connects to a community maintained lsp server that wraps tsserver https://github.com/neovim/nvim-lspconfig/blob/master/doc/ser...

Is it not possible to connect to tsserver directly? If so, do you have any information why?

TSServer predates lsp iirc

Oh, so TSServer is not an LSP server?

That's why an arbitrary LSP client can't connect to it.