feat(companion): add filtered runtime event subscription helper

src/companion/runtimeClient.ts

@@ -42,6 +42,7 @@ export interface CompanionRuntimeClientOptions {
 }
 
 export type CompanionEventHandler = (event: string, data: unknown) => void;
+export type CompanionTypedEventHandler<TData = unknown> = (data: TData) => void;
 
 export interface RegisterNodeInput {
   nodeId: string;
@@ -352,6 +353,18 @@ export class CompanionRuntimeClient {
     };
   }
 
+  subscribeEvent<TData = unknown>(
+    eventName: string,
+    handler: CompanionTypedEventHandler<TData>,
+  ): () => void {
+    return this.subscribeEvents((event, data) => {
+      if (event !== eventName) {
+        return;
+      }
+      handler(data as TData);
+    });
+  }
+
   async call<T>(method: string, params?: Record<string, unknown>): Promise<T> {
     if (!this.connected) {
       if (!this.autoConnect) {