nvimrc: add basic tsserver setup

nvimrc

@@ -632,6 +632,46 @@ nvim_lsp.solargraph.setup{
   on_attach = on_attach,
 }
 
+-- Typescript
+-- https://jose-elias-alvarez.medium.com/configuring-neovims-lsp-client-for-typescript-development-5789d58ea9c
+
+nvim_lsp.tsserver.setup{
+  on_attach = on_attach,
+}
+
+local filetypes = {
+  typescript = "eslint",
+  typescriptreact = "eslint",
+}
+local linters = {
+  eslint = {
+    sourceName = "eslint",
+    command = "eslint",
+    rootPatterns = {".eslintrc.js", "package.json"},
+    debounce = 100,
+    args = {"--stdin", "--stdin-filename", "%filepath", "--format", "json"},
+    parseJson = {
+      errorsRoot = "[0].messages",
+      line = "line",
+      column = "column",
+      endLine = "endLine",
+      endColumn = "endColumn",
+      message = "${message} [${ruleId}]",
+      security = "severity"
+    },
+    securities = {[1] = "error", [2] = "warning"}
+  }
+}
+
+nvim_lsp.diagnosticls.setup{
+  on_attach = on_attach,
+  filetypes = vim.tbl_keys(filetypes),
+  init_options = {
+    linters = linters,
+    filetypes = filetypes,
+  }
+}
+
 -- Lua
 
 local system_name