The correct shared module for Nest.js - https://blog.entrostat.com/setting-up-a-database-module-in-nest-js/

shared.module.ts

import { Module } from '@nestjs/common';
import { TypeOrmModule } from '@nestjs/typeorm';
import { DatabaseModule } from 'modules/database/database.module';
import { User } from 'modules/shared/entities/user.entity';
import { UserService } from './services/user.service';

@Module({
    imports: [DatabaseModule, TypeOrmModule.forFeature([User], Config.get.databases.main.name)],
    exports: [DatabaseModule, UserService],
    providers: [UserService]
})
export class SharedModule {}