feat(lang): add elm

lua/lazyvim/plugins/extras/lang/elm.lua

@@ -0,0 +1,48 @@
+return {
+  {
+    "nvim-treesitter/nvim-treesitter",
+    opts = function(_, opts)
+      if type(opts.ensure_installed) == "table" then
+        vim.list_extend(opts.ensure_installed, { "elm" })
+      end
+    end,
+  },
+  {
+    "williamboman/mason.nvim",
+    opts = function(_, opts)
+      opts.ensure_installed = opts.ensure_installed or {}
+      vim.list_extend(opts.ensure_installed, { "elm-language-server", "elm-format" })
+    end,
+  },
+  {
+    "stevearc/conform.nvim",
+    opts = {
+      formatters_by_ft = {
+        elm = { "elm_format" },
+      },
+    },
+  },
+  {
+    "neovim/nvim-lspconfig",
+    opts = {
+      servers = {
+        elmls = {},
+      },
+    },
+  },
+  { -- neotest config needs improvement from someone more expert than me
+    "nvim-neotest/neotest",
+    dependencies = {
+      "nvim-neotest/neotest-vim-test",
+      "vim-test/vim-test",
+    },
+    opts = {
+      adapters = {
+        ["neotest-vim-test"] = {
+          allow_file_types = { "elm" },
+          runner = "elmtest",
+        },
+      },
+    },
+  },
+}