Add TypeScript type definitions (#122)

Author: remcohaszing

index.d.ts

@@ -0,0 +1,12 @@
+import { Parser } from 'acorn' 
+
+declare const jsx: (options?: jsx.AcornJSXOptions) => (BaseParser: typeof Parser) => typeof Parser;
+
+declare namespace jsx {
+  interface Options {
+    allowNamespacedObjects?: boolean;
+    allowNamespaces?: boolean;
+  }
+}
+
+export = jsx;