trpc-sveltekit/dist/websocket/vitePlugin.js

SvelteKit adapter for tRPC.io, working with Node.js, Vercel and Netlify

import { createWSSGlobalInstance, onHttpServerUpgrade } from './svelteKitServer.js';
export const vitePluginTrpcWebSocket = {
    name: 'TrpcWebSocketServer',
    configureServer(server) {
        createWSSGlobalInstance();
        server.httpServer?.on('upgrade', onHttpServerUpgrade);
    }
};