Custom db logger service with TypeOrmModule.forRootAsync()

[ ] Regression 
[ ] Bug report
[ ] Feature request
[X] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead post your question on Stack Overflow.

Current behavior

I have a custom DB module to initialize TypeOrm (= Nestjs’s TypeOrmModule). I want to pass an TypeormLoggerService (which relies on an app-wide LoggerService). This is the code:

db.module.ts:

import { Module } from '@nestjs/common';
import { TypeOrmModule } from '@nestjs/typeorm';
import { TypeormLoggerService } from './typeorm-logger.service';

@Module({
  controllers: [],
  providers: [],
  imports: [
    TypeOrmModule.forRootAsync({
      inject: [TypeormLoggerService],
      useFactory: async (typeormLoggerService: TypeormLoggerService): Promise<any> => ({
        type: 'sqlite',
        database: `var/nest.db`,
        entities: [`src/**/**.entity{.ts,.js}`],
        logger: typeormLoggerService,
        logging: true
      }),
    })
  ]
})
export class DbModule {}

Node crashes with the following error:

1: node::Abort() [/usr/local/bin/node]
 2: node::Chdir(v8::FunctionCallbackInfo<v8::Value> const&) [/usr/local/bin/node]
 3: v8::internal::FunctionCallbackArguments::Call(void (*)(v8::FunctionCallbackInfo<v8::Value> const&)) [/usr/local/bin/node]
 4: v8::internal::MaybeHandle<v8::internal::Object> v8::internal::(anonymous namespace)::HandleApiCallHelper<false>(v8::internal::Isolate*, v8::internal::Handle<v8::internal::HeapObject>, v8::internal::Handle<v8::internal::HeapObject>, v8::internal::Handle<v8::internal::FunctionTemplateInfo>, v8::internal::Handle<v8::internal::Object>, v8::internal::BuiltinArguments) [/usr/local/bin/node]
 5: v8::internal::Builtin_Impl_HandleApiCall(v8::internal::BuiltinArguments, v8::internal::Isolate*) [/usr/local/bin/node]
 6: 0x1776425042fd

Environment

nest/typeorm version: 5.2.2
nest/common version: 5.3.5
nest/core version: 5.3.4

[kamilmysliwiec]

TypeOrmModule.forRootAsync({
   inject: [TypeormLoggerService],
   useFactory: ...,
})

You are trying to inject TypeormLoggerService which is unavailable in the TypeOrmModule. In order to provide it, you would have to import a module that exports TypeormLoggerService, for example:

TypeOrmModule.forRootAsync({
   imports: [TypeOrmLoggerModule], <------ THIS
   inject: [TypeormLoggerService],
   useFactory: ...,
})

[vrilcode]

I had to export TypeormLoggerService from DbModule and import it in TypeOrmModule although TypeOrmModule is included in the Module of TypeormLoggerService (DbModule). That was a bit confusing. But now I understand and it’s working. Thanks a lot!