feat(companion): add waitForEvent runtime helper

src/companion/runtimeClient.ts

@@ -43,6 +43,7 @@ export interface CompanionRuntimeClientOptions {
 
 export type CompanionEventHandler = (event: string, data: unknown) => void;
 export type CompanionTypedEventHandler<TData = unknown> = (data: TData) => void;
+export type CompanionEventPredicate<TData = unknown> = (data: TData) => boolean;
 
 export interface RegisterNodeInput {
   nodeId: string;
@@ -365,6 +366,42 @@ export class CompanionRuntimeClient {
     });
   }
 
+  waitForEvent<TData = unknown>(
+    eventName: string,
+    options?: {
+      timeoutMs?: number;
+      predicate?: CompanionEventPredicate<TData>;
+    },
+  ): Promise<TData> {
+    const timeoutMs = options?.timeoutMs ?? this.requestTimeoutMs;
+    const predicate = options?.predicate;
+
+    return new Promise<TData>((resolve, reject) => {
+      let settled = false;
+      const unsubscribe = this.subscribeEvent<TData>(eventName, (data) => {
+        if (predicate && !predicate(data)) {
+          return;
+        }
+        if (settled) {
+          return;
+        }
+        settled = true;
+        clearTimeout(timeout);
+        unsubscribe();
+        resolve(data);
+      });
+
+      const timeout = setTimeout(() => {
+        if (settled) {
+          return;
+        }
+        settled = true;
+        unsubscribe();
+        reject(new Error(`Timed out waiting for event ${eventName}`));
+      }, timeoutMs);
+    });
+  }
+
   async call<T>(method: string, params?: Record<string, unknown>): Promise<T> {
     if (!this.connected) {
       if (!this.autoConnect) {