Function onlyForHandshake

examples/passport-example/ts/index.ts:94–109

(
  middleware: (req: Request, res: Response, next: any) => void,
)

const io = new Server(httpServer);

function onlyForHandshake(
  middleware: (req: Request, res: Response, next: any) => void,
) {
  return (
    req: Request & { _query: Record<string, string> },
    res: Response,
    next: (err?: Error) => void,
  ) => {
    const isHandshake = req._query.sid === undefined;
    if (isHandshake) {
      middleware(req, res, next);
    } else {
      next();
    }
  };
}

io.engine.use(onlyForHandshake(sessionMiddleware));
io.engine.use(onlyForHandshake(passport.session()));