Add an error message if NPM is not available but needed

lua/nvim-treesitter/install.lua

@@ -184,6 +184,10 @@ local function run_install(cache_folder, install_folder, lang, repo, with_sync,
   end
   if generate_from_grammar then
     if repo.generate_requires_npm then
+      if not vim.fn.executable('npm') ~= 1 then
+        api.nvim_err_writeln('`'..lang..'` requires NPM to be installed from grammar.js')
+        return
+      end
       vim.list_extend(command_list, {
         {
           cmd = 'npm',

lua/nvim-treesitter/parsers.lua

@@ -433,7 +433,6 @@ list.jsdoc = {
   install_info = {
     url = "https://github.com/tree-sitter/tree-sitter-jsdoc",
     files = { "src/parser.c" },
-    requires_generate_from_grammar  = true,
   },
   maintainers = {"@steelsojka"},
 }