Nest.js:如何覆盖导入模块中的提供程序？

// app.module.ts
import { Module } from '@nestjs/common';
import { CatsModule } from './cats/cats.module';
import { DogsModule } from './dogs/dogs.module';

@Module({
  imports: [CatsModule, DogsModule],
})
export class AppModule {}

// cats.module.ts
import { Module } from '@nestjs/common';
import { CatsController } from './cats.controller';
import { CatsService } from './cats.service';

@Module({
  controllers: [CatsController],
  providers: [CatsService],
})
export class CatsModule {}

// dogs.module.ts
import { Module } from '@nestjs/common';
import { DogsController } from './dogs.controller';
import { DogsService } from './dogs.service';

@Module({
  controllers: [DogsController],
  providers: [DogsService],
})
export class DogsModule {}

// override.module.ts
import { Module } from '@nestjs/common';
import { CatsService } from './cats/cats.service';
import { DogsService } from './dogs/dogs.service';
import { OverrideCatsService } from './override-cats.service';
import { OverrideDogsService } from './override-dogs.service';

@Module({
  providers: [
    {
      provide: CatsService,
      useClass: OverrideCatsService,
    },
    {
      provide: DogsService,
      useClass: OverrideDogsService,
    },
  ],
  imports: [CatsModule, DogsModule],
})
export class OverrideModule {}