This is an improvement to allow @nestjs/typeorm@8.1.x to handle CustomRepository. I won't explain it specifically, but it will help in some way. https://github.com/nestjs/typeorm/pull/1233

README.md

You need to provide some classes and decorators yourself to maintain the same style as typeorm@2.x.

1. EntityRepository -> CustomRepository

@EntityRepository(UserEntity)
export class UserRepository extends Repository<UserEntity> {}

↓

@CustomRepository(UserEntity)
export class UserRepository extends Repository<UserEntity> {}

2. forFeature -> forCustomRepository

@Module({
  exports: [UserService],
  imports: [TypeOrmModule.forFeature([UserRepository])],
  providers: [UserService],
})
export class UserModule {}

↓

@Module({
  exports: [UserService],
  imports: [TypeOrmExModule.forCustomRepository([UserRepository])],
  providers: [UserService],
})
export class UserModule {}

database.options.ts

@Injectable()
export class DatabaseOptions implements TypeOrmOptionsFactory {

  public createTypeOrmOptions(): TypeOrmModuleOptions {
    return {
      ...
      entities: [UserEntity],
    };
  }
}

typeorm-ex.decorator.ts

import { SetMetadata } from "@nestjs/common";

export const TYPEORM_EX_CUSTOM_REPOSITORY = "TYPEORM_EX_CUSTOM_REPOSITORY";

export function CustomRepository(entity: Function): ClassDecorator {
  return SetMetadata(TYPEORM_EX_CUSTOM_REPOSITORY, entity);
}

typeorm-ex.module.ts

import { DynamicModule, Provider } from "@nestjs/common";
import { getDataSourceToken } from "@nestjs/typeorm";
import { DataSource } from "typeorm";
import { TYPEORM_EX_CUSTOM_REPOSITORY } from "./typeorm-ex.decorator";

export class TypeOrmExModule {
  public static forCustomRepository<T extends new (...args: any[]) => any>(repositories: T[]): DynamicModule {
    const providers: Provider[] = [];

    for (const repository of repositories) {
      const entity = Reflect.getMetadata(TYPEORM_EX_CUSTOM_REPOSITORY, repository);

      if (!entity) {
        continue;
      }

      providers.push({
        inject: [getDataSourceToken()],
        provide: repository,
        useFactory: (dataSource: DataSource): typeof repository => {
          const baseRepository = dataSource.getRepository<any>(entity);
          return new repository(baseRepository.target, baseRepository.manager, baseRepository.queryRunner);
        },
      });
    }

    return {
      exports: providers,
      module: TypeOrmExModule,
      providers,
    };
  }
}

user.module.ts

import { Module } from "@nestjs/common";
import { TypeOrmExModule } from "../database/typeorm-ex.module";
import { UserRepository } from "./user.repository";
import { UserService } from "./user.service";

@Module({
  exports: [UserService],
  imports: [TypeOrmExModule.forCustomRepository([UserRepository])],
  providers: [UserService],
})
export class UserModule {}

user.repository.ts

import { Repository } from "typeorm";
import { CustomRepository } from "../database/typeorm-ex.decorator";
import { UserEntity } from "./user.entity";

@CustomRepository(UserEntity)
export class UserRepository extends Repository<UserEntity> {}

user.service.ts

import { Injectable } from "@nestjs/common";
import { UserRepository } from "./user.repository";

@Injectable()
export class UserService {
  constructor(private readonly repository: UserRepository) {}
}