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Syntax:
```ts
interface ServerToClientEvents {
"my-event": (a: number, b: string, c: number[]) => void;
}
interface ClientToServerEvents {
hello: (message: string) => void;
}
const socket: Socket<ServerToClientEvents, ClientToServerEvents> = io();
socket.emit("hello", "world");
socket.on("my-event", (a, b, c) => {
// ...
});
```
The events are not typed by default (inferred as any), so this change
is backward compatible.
Related: https://github.com/socketio/socket.io/issues/3742