feat: add null-ls to auto-format with prettier

nvim/lua/plugins.lua

@@ -132,6 +132,25 @@ return require('packer').startup(function(use)
         config = function() require('plugins.nvim-lsp-setup') end,
     }
 
+    -- null-ls
+    use {
+        "jose-elias-alvarez/null-ls.nvim",
+        requres = {
+            { "nvim-lua/plenary.nvim" },
+        },
+        config = function()
+            require("null-ls").setup({
+                sources = {
+                    require("null-ls").builtins.formatting.prettier,
+                },
+                on_attach = function(client)
+                    local utils = require("nvim-lsp-setup.utils")
+                    utils.format_on_save(client)
+                end,
+            })
+        end,
+    }
+
     -- treesitter
     use({
         'nvim-treesitter/nvim-treesitter',