feat(companion): add known event name typing and listing

src/companion/index.ts

@@ -14,6 +14,7 @@ export type {
   CompanionRuntimeClientOptions,
   CompanionEventHandler,
   CompanionTypedEventHandler,
+  CompanionEventName,
   CompanionEventPredicate,
   CompanionEventEnvelope,
   RegisterNodeInput,

src/companion/runtimeClient.test.ts

@@ -224,6 +224,18 @@ describe('CompanionRuntimeClient', () => {
     expect(typingHandler).toHaveBeenCalledWith({ active: true });
   });
 
+  it('lists known companion event names', () => {
+    const client = new CompanionRuntimeClient({
+      url: 'ws://127.0.0.1:1',
+    });
+
+    expect(client.listKnownEventNames()).toEqual([
+      'agent.stream',
+      'agent.typing',
+      'context_warning',
+    ]);
+  });
+
   it('supports subscribeContextWarning helper', () => {
     const client = new CompanionRuntimeClient({
       url: 'ws://127.0.0.1:1',

src/companion/runtimeClient.ts

@@ -54,6 +54,8 @@ export const COMPANION_EVENT_NAMES = {
   agentTyping: 'agent.typing',
   contextWarning: 'context_warning',
 } as const;
+export type CompanionEventName =
+  (typeof COMPANION_EVENT_NAMES)[keyof typeof COMPANION_EVENT_NAMES];
 
 export interface RegisterNodeInput {
   nodeId: string;
@@ -388,7 +390,7 @@ export class CompanionRuntimeClient {
   }
 
   subscribeEvent<TData = unknown>(
-    eventName: string,
+    eventName: CompanionEventName | string,
     handler: CompanionTypedEventHandler<TData>,
   ): () => void {
     return this.subscribeEvents((event, data) => {
@@ -418,7 +420,7 @@ export class CompanionRuntimeClient {
   }
 
   waitForEvent<TData = unknown>(
-    eventName: string,
+    eventName: CompanionEventName | string,
     options?: {
       timeoutMs?: number;
       predicate?: CompanionEventPredicate<TData>;
@@ -480,7 +482,7 @@ export class CompanionRuntimeClient {
   }
 
   waitForAnyEvent<TData = unknown>(
-    eventNames: readonly string[],
+    eventNames: readonly (CompanionEventName | string)[],
     options?: {
       timeoutMs?: number;
       predicate?: (event: string, data: TData) => boolean;
@@ -573,6 +575,10 @@ export class CompanionRuntimeClient {
     return this.waitForEvent<TData>(COMPANION_EVENT_NAMES.contextWarning, options);
   }
 
+  listKnownEventNames(): CompanionEventName[] {
+    return Object.values(COMPANION_EVENT_NAMES);
+  }
+
   async call<T>(method: string, params?: Record<string, unknown>): Promise<T> {
     if (!this.connected) {
       if (!this.autoConnect) {