Lazyvim: Associate custom file extension to a filetype

README.md

neovim (nvim) settings for associating *.jbuilder files to ruby language for LazyVim using filetype function.

To reach that we need to tune up nvim-treesitter plugin options.

treesitter.lua

-- .config/nvim/lua/plugins/treesitter.lua
return {
  {
    "nvim-treesitter/nvim-treesitter",
    opts = function(_, _)
      vim.filetype.add({
        extension = { jbuilder = "ruby" },
      })
    end,
  },
}