How to set which filetypes LSPs are run on in Neovim

You can use the filetypes config within lspconfig.lsp_name.setup({...}) to override the default filetypes on which a given LSP runs on.

For example, in my case I wanted the css_variables LSP to run on vue files, which it doesn’t by default.

This can be done by overriding the filetypes option on the setup function call:

require("lspconfig").css_variables.setup({
    filetypes = {
        "css",
        "scss",
        "less",
        "vue",
    },
})

Other options other than filetypes can also be overriden.

A full list of LSPs and their respective options supported by lspconfig can be found by running :help lspconfig-all, which is really useful for finding and overriding their default settings.