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WebSocket Link

www/versioned_docs/version-10.x/client/links/wsLink.md

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wsLink is a terminating link that's used when using tRPC's WebSockets Client and Subscriptions, which you can learn more about here.

Usage

To use wsLink, you need to pass it a TRPCWebSocketClient, which you can create with createWSClient:

ts
import { createTRPCProxyClient, createWSClient, wsLink } from '@trpc/client';
import type { AppRouter } from '../server';

const wsClient = createWSClient({
  url: 'ws://localhost:3000',
});

const trpcClient = createTRPCProxyClient<AppRouter>({
  links: [wsLink<AppRouter>({ client: wsClient })],
});

The wsLink function requires a TRPCWebSocketClient to be passed, which can be configured with the fields defined in WebSocketClientOptions:

ts
export interface WebSocketLinkOptions {
  client: TRPCWebSocketClient;
}

function createWSClient(opts: WebSocketClientOptions) => TRPCWebSocketClient

export interface WebSocketClientOptions {
  url: string;
  WebSocket?: typeof WebSocket;
  retryDelayMs?: typeof retryDelay;
  onOpen?: () => void;
  onClose?: (cause?: { code?: number }) => void;
}

Reference

You can check out the source code for this link on GitHub.