ERR_INVALID_ARG_TYPE when setting req.session.userId about lireddit HOT 2 OPEN

just ran into this issue and my solution was to switch to ioredis from redis, based on my reading there seems to be some sort of collision of types in redis v4.

additionally, ioredis uses new redis instead of redis.redisClient.

so the code that works for me is :

import redis from "ioredis"; 

const RedisStore = connectRedis(session);
const redisClient = new redis();

and the types.ts export type is unchanged

from lireddit.

Never mind; I managed to solve it.
For anyone looking for the solution, you have to set the redis client to use legacyMode in index.ts:

  const redisClient = redis.createClient({
    legacyMode: true,
  });

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