Only advertise semanticTokens if there's a handler#640
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Neovim 0.12 and above will make `semanticTokens` requests on every
cursor movement. Currently, the `lsp` library advertises
`semanticTokens` capabilities, even if the LSP server implemented with
this library doesn't a handler. This means that every time I move my
cursor I get a blocking error in my editor, making it essentially
unusable!
Let's only advertise the capability if there's a handler registered.
Here's a workaround in my Neovim config:
```
vim.lsp.config("hls", {
cmd = { "static-ls" },
on_init = function(client)
-- static-ls (via the `lsp` Haskell library) falsely advertises
-- semanticTokensProvider but registers no handler, producing a
-- "no handler for: textDocument/semanticTokens/full" message on
-- every cursor move. Strip it.
client.server_capabilities.semanticTokensProvider = nil
end,
})
```
josephsumabat
pushed a commit
to josephsumabat/static-ls
that referenced
this pull request
May 15, 2026
`lsp` falsely advertises `semanticTokens` capabilities, regardless of what we support. Register some no-op handlers so that clients which trust the LSP server don't crash out. See: haskell/lsp#640
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Neovim 0.12 and above will make
semanticTokensrequests on every cursor movement. Currently, thelsplibrary advertisessemanticTokenscapabilities, even if the LSP server implemented with this library doesn't a handler. This means that every time I move my cursor I get a blocking error in my editor, making it essentially unusable!Let's only advertise the capability if there's a handler registered.
Here's a workaround in my Neovim config: