P1B: Refactor (packages/slack/src/index.ts:31): Deeply nested control flow

### Uniqueness check

- [x] I have searched open issues and confirmed this **file + smell** is not already taken.

### Full path to the Typescript file

packages/slack/src/index.ts

### Function(s)/scope targeted

async()

### Relevant Qlty output

```shell
packages/slack/src/index.ts
  31  Deeply nested control flow (level = 5)
```