NestJS 9: InjectKysley type error Argument of type 'undefined' is not assignable to parameter of type 'string | symbol'.

[jdpt0]

When injecting the kysley module with InjectKysely in NestJS 9 there is a type error:

TS1239: Unable to resolve signature of parameter decorator when called as an expression.   Argument of type 'undefined' is not assignable to parameter of type 'string | symbol'.

This seems to be stemming from the fact that when the package is being published, it is being published with NestJS 8 as it's dependency, which results in the wrong typings for the decorator when using it in NestJS 9.

[abnaod]

You can try to inject the module directly instead of using the wrapper decorator InjectKysely.

import { KYSELY_MODULE_CONNECTION_TOKEN } from 'nestjs-kysely';
import { Inject, Injectable } from '@nestjs/common';

import { DB } from '../db/types';
@Injectable()
export class UsersService {
  constructor(@Inject(KYSELY_MODULE_CONNECTION_TOKEN) private readonly db: Kysely<DB>) {}
}

[johnsvanda]

Or add this "strictNullChecks": false to your tsconfig

[kazu728]

Sorry for the late reply.
If you are still getting this issue and are having trouble with it, I would appreciate it if you could provide some reproducible code.