return function()
  vim.filetype.add {
    extension = {
      avsc = "json",
    },
  }
  vim.filetype.add {
    extension = {
      dataviewjs = "javascript",
    },
  }

  local ft_to_parser = require("nvim-treesitter.parsers").filetype_to_parsername
  ft_to_parser.dataviewjs = "javascript"

  -- Set up custom filetypes
  -- vim.filetype.add {
  --   extension = {
  --     foo = "fooscript",
  --   },
  --   filename = {
  --     ["Foofile"] = "fooscript",
  --   },
  --   pattern = {
  --     ["~/%.config/foo/.*"] = "fooscript",
  --   },
  -- }
end