Added option for enabling none-ls if preferred

.config/nvim/lua/josean/plugins/formatting.lua

@@ -1,6 +1,7 @@
 return {
   "stevearc/conform.nvim",
-  event = { "BufReadPre", "BufNewFile" },
+  lazy = true,
+  event = { "BufReadPre", "BufNewFile" }, -- to disable, comment this out
   config = function()
     local conform = require("conform")
 

.config/nvim/lua/josean/plugins/linting.lua

@@ -1,9 +1,7 @@
 return {
   "mfussenegger/nvim-lint",
-  event = {
-    "BufReadPre",
-    "BufNewFile",
-  },
+  lazy = true,
+  event = { "BufReadPre", "BufNewFile" }, -- to disable, comment this out
   config = function()
     local lint = require("lint")
 

.config/nvim/lua/josean/plugins/lsp/none-ls.lua

@@ -0,0 +1,74 @@
+return {
+  "nvimtools/none-ls.nvim", -- configure formatters & linters
+  lazy = true,
+  -- event = { "BufReadPre", "BufNewFile" }, -- to enable uncomment this
+  dependencies = {
+    "jay-babu/mason-null-ls.nvim",
+  },
+  config = function()
+    local mason_null_ls = require("mason-null-ls")
+
+    local null_ls = require("null-ls")
+
+    local null_ls_utils = require("null-ls.utils")
+
+    mason_null_ls.setup({
+      ensure_installed = {
+        "prettier", -- prettier formatter
+        "stylua", -- lua formatter
+        "black", -- python formatter
+        "pylint", -- python linter
+        "eslint_d", -- js linter
+      },
+    })
+
+    -- 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({
+      -- add package.json as identifier for root (for typescript monorepos)
+      root_dir = null_ls_utils.root_pattern(".null-ls-root", "Makefile", ".git", "package.json"),
+      -- setup formatters & linters
+      sources = {
+        --  to disable file types use
+        --  "formatting.prettier.with({disabled_filetypes: {}})" (see null-ls docs)
+        formatting.prettier.with({
+          extra_filetypes = { "svelte" },
+        }), -- js/ts formatter
+        formatting.stylua, -- lua formatter
+        formatting.isort,
+        formatting.black,
+        diagnostics.pylint,
+        diagnostics.eslint_d.with({ -- js/ts linter
+          condition = function(utils)
+            return utils.root_has_file({ ".eslintrc.js", ".eslintrc.cjs" }) -- only enable if root has .eslintrc.js or .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,
+    })
+  end,
+}