Update types

Author: bradlc

src/index.d.ts

@@ -1,2 +1,7 @@
-declare function plugin(options?: { strategy?: 'base' | 'class' }): Function
+declare function plugin(options?: Partial<{ strategy: 'base' | 'class' }>): { handler: () => void }
+
+declare namespace plugin {
+  const __isOptionsFunction: true
+}
+
 export = plugin