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Trying to use NestJS and TypeORM? Trying to use the provided ConfigModule with forRootAsync? Cool, you might get an error.

import { Module } from '@nestjs/common';
import { TypeOrmModule } from '@nestjs/typeorm';
import { AppController } from './app.controller';
import { AppService } from './app.service';
import { ConfigModule, ConfigService } from '@nestjs/config';

  imports: [
      isGlobal: true,
      imports: [ConfigModule],
      useFactory: async (configService: ConfigService) => ({
        type: 'postgres',
        host: configService.get('DB_HOST'),
        port: configService.get('DB_PORT'),
        username: configService.get('DB_USERNAME'),
        password: configService.get('DB_PASSWORD'),
        database: configService.get('DB_NAME'),
        synchronize: false,
        autoLoadEntities: true,
      inject: [ConfigService],
  controllers: [AppController],
  providers: [AppService],
export class AppModule {}

In this case, the error is like so:

Type '(configService: ConfigService) => Promise<{ type: string; host: any; port: any; username: any; password: any; database: any; synchronize: boolean; autoLoadEntities: boolean; }>' is not assignable to type '(...args: any[]) => ({ retryAttempts?: number; retryDelay?: number; autoLoadEntities?: boolean; keepConnectionAlive?: boolean; } & Partial<MysqlConnectionOptions>) | ... 13 more ... | Promise<...>'.

Not very helpful, but a solution exists. But it's not great.

Cast the postgres indicator to like so:

type: 'postgres' as 'postgres'

Hopefully this gets resolved soon.

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