Disable lsp but not highlighting for certain file types?

[seanbone]

I'm writing CUDA code, and for whatever reason clangd has trouble with my *.cu files.

Is it possible to disable the LSP for *.cu files, but keep C++-style syntax highlighting?

If I remove *.cu from C++'s file-types entry in languages.toml, I lose syntax highlighting too. I tried adding the following to no avail:

[[language]]
name = "cuda"
scope = "source.cu"
injection-regex = "cpp"
file-types = ["cu", "cuh"]
auto-format = true
roots = []
comment-token = "//"
# language-servers = [ "clangd" ]
indent = { tab-width = 2, unit = "  " }
grammar = "cpp"

[pascalkuthe]

configs are merged automatically so:

[[language]]
name = "cuda"
language-servers = []

you can also do :lsp-stop from within the editor

[seanbone]

The issue is that cuda isn't its own language in the default helix conf; the *.cu filetype is classed as C++. Adding just this complains about "missing field scope in language".