fix type error

package.json

@@ -53,6 +53,7 @@
   "license": "ISC",
   "dependencies": {
     "@louislam/sqlite3": "^6.0.0",
+    "@types/koa-compose": "^3.2.5",
     "chokidar": "^3.5.1",
     "jsonschema": "^1.4.0",
     "jsonwebtoken": "^8.5.1",

src/client/page/contentinfo.tsx

@@ -33,7 +33,7 @@ export function ReaderPage(props?: {}) {
     if (match == null) {
         throw new Error("unreachable");
     }
-    const id = Number.parseInt(match.id);
+    const id = Number.parseInt(match.id ?? "NaN");
     const [info, setInfo] = useState<DocumentState>({ doc: undefined, notfound: false });
     const menu_list = (link?: string) => <CommonMenuList url={link}></CommonMenuList>;
 

src/diff/watcher/watcher_filter.ts

@@ -9,6 +9,12 @@ export class WatcherFilter extends EventEmitter implements IDiffWatcher{
     on<U extends keyof DiffWatcherEvent>(event:U,listener:DiffWatcherEvent[U]): this{
         return super.on(event,listener);
     }
+    /**
+     * emit event
+     * @param event 
+     * @param arg 
+     * @returns `true` if the event had listeners, `false` otherwise.
+     */
     emit<U extends keyof DiffWatcherEvent>(event:U,...arg:Parameters<DiffWatcherEvent[U]>): boolean{
         if(event === "change"){
             const prev = arg[0];