Querying the online user list

SessionStore.ts

getOnlineUsers = async () => {
    const keys = new Set();
    let cursor = "0";
    do {
      await new Promise((resolve, reject) =>
        this.redisClient.scan(
          cursor,
          "MATCH",
          "session:*",
          "COUNT",
          "100",
          (err, reply) => {
            cursor = reply[0];
            reply[1].forEach((key: string) => keys.add(key));
            if (cursor === "0") {
              resolve("ok");
            }
          }
        )
      );
    } while (cursor !== "0");

    const commands: any[] = [];
    keys.forEach((key: unknown) =>
      commands.push(["hmget", key, "username", "connected"])
    );

    return await new Promise((resolve, reject) => {
      this.redisClient.multi(commands).exec((err, reply) => {
        const userArray = reply.map((result: string[]) => mapSession(result));

        return resolve(userArray.filter((user) => user.connected === "true"));
      });
    });
  };