Function handler

packages/socket.io/test/namespaces.ts:603–608

()

      });

      const handler = () => {
        if (++counters.events === 2) {
          expect(counters.created).to.equal(1);
          success(done, io, one, two);
        }
      };

      io.of((name, query, next) => {
        buffer.push(next);