v3: code quality pass

api/services/ws-service.ts

@@ -3,6 +3,7 @@ import type {
   Dump,
   OnlineUser,
   Playlist,
+  ServerToClientMessage,
   User,
 } from "../model/interfaces.ts";
 
@@ -51,13 +52,13 @@ export function getOnlineUsers(): OnlineUser[] {
   return Array.from(seen.values());
 }
 
-function send(socket: WebSocket, data: unknown): void {
+function send(socket: WebSocket, data: ServerToClientMessage): void {
   if (socket.readyState === WebSocket.OPEN) {
     socket.send(JSON.stringify(data));
   }
 }
 
-export function sendToUser(userId: string, data: unknown): void {
+export function sendToUser(userId: string, data: ServerToClientMessage): void {
   for (const client of clients) {
     if (client.userId === userId) {
       send(client.socket, data);
@@ -109,7 +110,7 @@ export function broadcastVoteUpdate(
 
 function sendToPlaylistAudience(
   playlist: Pick<Playlist, "isPublic" | "userId">,
-  data: unknown,
+  data: ServerToClientMessage,
 ): void {
   for (const client of clients) {
     if (playlist.isPublic || client.userId === playlist.userId) {