modern toc tweaks

index.d.ts

@@ -1,4 +1,17 @@
 declare module '*.scss' {
-  const content: string 
+  const content: string
   export = content
 }
+
+// dom custom event
+interface CustomEventMap {
+  "spa_nav": CustomEvent<{ url: string }>;
+}
+
+declare global {
+  interface Document {
+    addEventListener<K extends keyof CustomEventMap>(type: K,
+      listener: (this: Document, ev: CustomEventMap[K]) => void): void;
+    dispatchEvent<K extends keyof CustomEventMap>(ev: CustomEventMap[K]): void;
+  }
+}