add some formatting and linting config

lua/custom/lsp/mason.lua

@@ -12,7 +12,7 @@ local servers = {
     gopls = {},
     -- pyright = {},
     -- rust_analyzer = {},
-    tsserver = {},
+    -- tsserver = {},
     -- html = { filetypes = { 'html', 'twig', 'hbs'} },
 
     lua_ls = {
@@ -48,3 +48,20 @@ mason_lspconfig.setup_handlers {
         }
     end
 }
+
+-- import mason-null-ls plugin safely
+local mason_null_ls_status, mason_null_ls = pcall(require, "mason-null-ls")
+if not mason_null_ls_status then
+    return
+end
+
+mason_null_ls.setup({
+    -- List of formatters and linters for Mason to install
+    ensure_installed = {
+        "prettier", -- ts/js formatter
+        "stylua", -- lua formatter
+        "eslint_d", -- ts/js linter
+    },
+    -- auto-install configured formatters & linters (with null-ls)
+    automatic_installation = true,
+})

lua/custom/lsp/null-ls.lua

@@ -0,0 +1,48 @@
+-- import null-ls plugin safely
+local setup, null_ls = pcall(require, "null-ls")
+if not setup then
+    return
+end
+
+-- for conciseness
+local formatting = null_ls.builtins.formatting   -- to setup formatters
+local diagnostics = null_ls.builtins.diagnostics -- to setup linters
+
+-- to setup format on save
+local augroup = vim.api.nvim_create_augroup("LspFormatting", {})
+
+-- configure null_ls
+null_ls.setup({
+    -- setup formatters & linters
+    sources = {
+        --  to disable file types use
+        --  "formatting.prettier.with({disabled_filetypes = {}})" (see null-ls docs)
+        formatting.prettier,        -- js/ts formatter
+        formatting.stylua,          -- lua formatter
+        diagnostics.eslint_d.with({ -- js/ts linter
+            -- only enable eslint if root has .eslintrc.js or .eslintrc.cjs
+            condition = function(utils)
+                return utils.root_has_file(".eslintrc.js") or utils.root_has_file(".eslintrc.cjs")
+            end,
+        }),
+    },
+    -- configure format on save
+    on_attach = function(current_client, bufnr)
+        if current_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({
+                        filter = function(client)
+                            --  only use null-ls for formatting instead of lsp server
+                            return client.name == "null-ls"
+                        end,
+                        bufnr = bufnr,
+                    })
+                end,
+            })
+        end
+    end,
+})

lua/custom/plugins/init.lua

@@ -6,4 +6,11 @@ return {
 	'tpope/vim-surround',
 	'szw/vim-maximizer',
 	'vim-scripts/ReplaceWithRegister',
+	{
+		"pmizio/typescript-tools.nvim",
+		dependencies = { "nvim-lua/plenary.nvim", "neovim/nvim-lspconfig" },
+		opts = {},
+	},
+	'jose-elias-alvarez/null-ls.nvim',
+	"jayp0521/mason-null-ls.nvim",
 }