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packages/shared/src/rtc/index.ts

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+export * from './token.js';
+export * from './types.js';

packages/shared/src/rtc/token.ts

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+import type { AppSupabaseClient } from '../supabase/client.js';
+import type { LivekitToken } from './types.js';
+
+// Fetch a short-lived LiveKit access token via the mint-livekit-token
+// edge function. The server-side RLS check lives inside that function.
+export async function fetchLivekitToken(
+  client: AppSupabaseClient,
+  conversationId: string,
+): Promise<LivekitToken> {
+  const { data, error } = await client.functions.invoke('mint-livekit-token', {
+    body: { conversationId },
+  });
+  if (error) throw error;
+  if (!data || typeof data !== 'object') {
+    throw new Error('invalid token response');
+  }
+  const d = data as Partial<LivekitToken>;
+  if (!d.token || !d.url || !d.roomName || !d.identity) {
+    throw new Error('incomplete token response');
+  }
+  return {
+    token: d.token,
+    url: d.url,
+    roomName: d.roomName,
+    identity: d.identity,
+  };
+}

packages/shared/src/rtc/types.ts

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+// Call signaling + token types. Realtime broadcast payloads live on a
+// per-user channel (`call-signals:<userId>`) so incoming invites surface
+// even if the recipient isn't currently on the relevant chat route.
+
+export type CallKind = 'audio' | 'video';
+
+export interface CallInvitePayload {
+  type: 'invite';
+  callId: string;
+  conversationId: string;
+  fromUserId: string;
+  kind: CallKind;
+  sentAt: string; // ISO
+}
+
+export interface CallAcceptPayload {
+  type: 'accept';
+  callId: string;
+  byUserId: string;
+}
+
+export interface CallRejectPayload {
+  type: 'reject';
+  callId: string;
+  byUserId: string;
+}
+
+export interface CallCancelPayload {
+  type: 'cancel';
+  callId: string;
+  byUserId: string;
+}
+
+export interface CallEndPayload {
+  type: 'end';
+  callId: string;
+  byUserId: string;
+}
+
+export type CallSignal =
+  | CallInvitePayload
+  | CallAcceptPayload
+  | CallRejectPayload
+  | CallCancelPayload
+  | CallEndPayload;
+
+export function signalTopic(userId: string): string {
+  return 'call-signals:' + userId;
+}
+
+export interface LivekitToken {
+  token: string;
+  url: string;
+  roomName: string;
+  identity: string;
+}