server-ts: Port services/notes & hidden_subtree

src/types.d.ts

@@ -0,0 +1,14 @@
+/*
+ * This file contains type definitions for libraries that did not have one
+ * in its library or in `@types/*` packages.
+ */
+
+declare module 'unescape' {
+    function unescape(str: string, type?: string): string;
+    export = unescape;
+}
+
+declare module 'html2plaintext' {
+    function html2plaintext(htmlText: string): string;
+    export = html2plaintext;
+}