如何从NestJS中的模块导入中获取配置？

import { Module } from '@nestjs/common';
import { ConfigModule } from '@nestjs/config';

@Module({
  imports: [
    ConfigModule.forRoot({
      // 配置文件的路径，可以是相对路径或绝对路径
      envFilePath: '.env',
      // 是否将配置信息注入到全局作用域中
      isGlobal: true,
    }),
  ],
})
export class AppModule {}

import { Injectable } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';

@Injectable()
export class MyService {
  constructor(private configService: ConfigService) {}

  getDatabaseConfig(): any {
    const host = this.configService.get<string>('DATABASE_HOST');
    const port = this.configService.get<number>('DATABASE_PORT');
    const username = this.configService.get<string>('DATABASE_USERNAME');
    const password = this.configService.get<string>('DATABASE_PASSWORD');

    return {
      host,
      port,
      username,
      password,
    };
  }
}