HGET can return null, but TypeScript says it can't

[lantw44]

Description

Run the example code:

import { createClient, RedisClientOptions } from 'redis';

const options: RedisClientOptions = {};
const client = await createClient(options)
  .on('error', err => console.log('Redis Client Error', err))
  .connect();

const value = await client.HGET('hash', 'key');
console.log(value);

await client.disconnect();

It prints null if hash doesn't exist on the server. However, TypeScript says:

┌─────────────────────────────────────────────────┐
│const value: string | undefined                  │
└─────────────────────────────────────────────────┘

Which is wrong. TypeScript should remind the caller it should handle null.

Node.js Version

20.12.2

Redis Server Version

7.0.7 (Amazon ElastiCache)

Node Redis Version

4.7.0

Platform

Linux

Logs

No response

[leibale]

Oops... 🤦
To fix it we should change the HGET transformReply function type to return RedisCommandArgument | null rather than RedisCommandArgument | undefined.

LMK if you want to create a PR, or if you prefer that I'll do that..