Use deno fmt for deno projects instead of prettier

[Callumk7]

Hey all,
I havn't been able to figure out how to use the builtin deno fmt only for deno projects, and prettier for all other projects. for lsp, this is setup by checking to see if the root dir contains a package.json or a deno.json. Is there something similar I can do with null-ls? Here is my current config, its very bare bones:

local present, null_ls = pcall(require, "null-ls")

if not present then
  return
end

local b = null_ls.builtins

-- copied from the null_ls docs
-- required for format on save
local augroup = vim.api.nvim_create_augroup("LspFormatting", {})

local sources = {

  -- webdev stuff
  b.formatting.deno_fmt,
  b.formatting.prettier,
  b.diagnostics.eslint,

  -- Lua
  b.formatting.stylua,

  -- Rust
  b.formatting.rustfmt,
}

-- format on save
null_ls.setup {
  on_attach = function(client, bufnr)
    if client.supports_method "textDocument/formatting" then
      vim.api.nvim_clear_autocmds { group = augroup, buffer = bufnr }
      vim.api.nvim_create_autocmd("BufWritePre", {
        group = augroup,
        buffer = bufnr,
        callback = function()
          vim.lsp.buf.format { bufnr = bufnr }
        end,
      })
    end
  end,
  debug = true,
  sources = sources,
}

[fitrh]

You can use condition

local sources = {
  b.formatting.deno_fmt.with({
    condition = function(u)
      return u.root_has_file({ 'deno.json' })
    end,
  }),
}

You can read BUILTIN_CONFIG.md#conditional-sources for the details

[Callumk7]

Thank you 👍