Fix formatting

source/sse-session/async-push-iterator.ts

@@ -35,7 +35,7 @@ export class AsyncPushIterator<T> {
         // `start`'s `this` is the underlying source object when using a plain method.
         // An arrow function captures the class instance so the controller is stored here.
         this.stream = new ReadableStream({
-            start: (controller: ReadableStreamDefaultController<T>) => {
+            start: (controller: ReadableStreamDefaultController<T>): void => {
                 this.controller = controller;
             },
         });
@@ -76,7 +76,7 @@ export class AsyncPushIterator<T> {
      * Uses `preventCancel: true` so early `break` from `for await...of` does not
      * close the stream and block later pushes.
      */
-    [Symbol.asyncIterator]() {
+    [Symbol.asyncIterator](): AsyncIterableIterator<T> {
         return this.stream.values({ preventCancel: true });
     }
 }