Add tests. Add exponential backoff contexts. Update error handling. Imrove Event Parser compatibility. Simplify SSE Session. Simplify Async Iterator.

src/utils/event-emitter.ts

@@ -1,8 +1,3 @@
-// TODO: You'll probably want to use WeakRef's here.
-// NOTE: Looked into the WeakRefs, but they are extremely challenging to work well without side-effects.
-// Things like anonymous functions and closures will get cleaned up immediately and the side-effects from a developer's perspective
-// are likely more painful than leaving event listener cleanup to the developer.
-// - Harvmaster 2026-05-24
 export type EventMap = Record<string, unknown>;
 
 type Listener<T> = (detail: T) => void;
@@ -181,13 +176,14 @@ export class EventEmitter<T extends EventMap> {
       let timeoutId: ReturnType<typeof setTimeout> | undefined;
 
       // Create a listener function.
-      const listener = (payload: T[K]) => {
+      const listener = (payload: T[K]): void => {
         if (predicate(payload)) {
           // Clean up
           this.off(type, listener);
           if (timeoutId !== undefined) {
             clearTimeout(timeoutId);
           }
+
           resolve(payload);
         }
       };
@@ -219,10 +215,11 @@ export class EventEmitter<T extends EventMap> {
     let timeout: ReturnType<typeof setTimeout>;
 
     return (detail: T[K]) => {
-      // If the timeout is not null, clear it.
-      if (timeout !== null) {
+      // If a debounce timer is already pending, clear it before scheduling the next one.
+      if (timeout !== undefined) {
         clearTimeout(timeout);
       }
+
       timeout = setTimeout(() => {
         func(detail);
       }, wait);