为什么useFactory选项会使我在nestjs配置中出错？

Question

类型“（ConfigService：ConfigService）=>Promise<{Type：String；Port：String；UserName：String；Password：String；Database：String；Host：String；Entities：String[]；Synchronize：Boolean；}>”不能分配给类型“（...args：any[])=>（{RetryAttempts？：Number；RetryDelay？：Number；KeepConnectionAlive？：Boolean；}&Partial）（{RetryAttempts？：Number；类型“Promise<{Type：String；Port：String；UserName：String；Password：String；Database：String；Host：String；Entities：String[]；Synchronize：Boolean；}>”不能分配给类型“（{RetryAttempts？：Number；RetryDelay？：Number；KeepConnectionAlive？：Boolean；}&Partial）（{RetryAttempts？：Number；RetryDelay？：Number；KeepConnectionAlive？：Boolean；}类型“Promise<{Type：String；Port：String；UserName：String；Password：String；Database：String；Host：String；Entities:String[]；Synchronize:Boolean；}>”不能分配给类型“Promise”。类型“{Type：String；Port：String；UserName：String；Password：String；Database：String；Host：String；Entities:String[]；Synchronize：Boolean；}”不能分配给类型“TypeOrmModuleOptions”。类型“{Type：String；Port：String；UserName：String；Password：String；Database：String；Host：String；Entities：String[]；Synchronize：Boolean；}”不能分配给类型“{RetryAttempts？：Number；RetryDelay？：Number；KeepConnectionAlive？：Boolean；}&Partial”。类型“{Type：String；Port：String；UserName：String；Password：String；Database：String；Host：String；Entities:String[]；Synchronize：Boolean；}”不能分配给类型“Partial”。属性“type”的类型不兼容。类型“String”不能分配给类型“Aurora-Data-API”“。

这是nestjs给我的信息，我按照文档中的说明操作，但对我来说并不适用。

这是我的app.module.ts

import { Module } from '@nestjs/common';
import { AppController } from './app.controller';
import { AppService } from './app.service';
import { CategoryModule } from './category/category.module';
import { ProductModule } from './product/product.module';
import { UnitModule } from './unit/unit.module';
import { TypeOrmModule } from '@nestjs/typeorm';
import { ConfigModule } from './config/config.module';
import { ConfigService } from './config/config.service';
import { RolModule } from './rol/rol.module';
import { UserModule } from './user/user.module';
import { AuthModule } from './auth/auth.module';

@Module({
  imports: [TypeOrmModule.forRootAsync({
    imports: [ConfigModule],
    inject: [ConfigService],
    useFactory: async (configService: ConfigService) => ({
      type: 'mysql',
      port: configService.port,
      username: configService.username,
      password: configService.password,
      database: configService.database,
      host: configService.host,
      entities: [__dirname + '/**/*.entity{.ts,.js}'],
      synchronize: true,
    }),
  }), CategoryModule, UnitModule, ProductModule, RolModule, UserModule, AuthModule],
  controllers: [AppController],
  providers: [AppService],
})
export class AppModule {}

这是我的配置/config.service.ts

import * as dotenv from 'dotenv';
import * as fs from 'fs';
import * as Joi from '@hapi/joi';

export interface EnvConfig {
    [key: string]: string;
}

export class ConfigService {
    private readonly envConfig: EnvConfig;

    constructor(filePath: string) {
        const config = dotenv.parse(fs.readFileSync(filePath));
        this.envConfig = this.validateInput(config);
    }

    private validateInput(envConfig: EnvConfig): EnvConfig {
        const envVarsSchema: Joi.ObjectSchema = Joi.object({
            NODE_ENV: Joi.string()
            .valid('development', 'production', 'test', 'provision')
            .default('development'),
            PORT: Joi.number().default(3000),
            HOST: Joi.strict(),
            USERNAME: Joi.string(),
            PASSWORD: Joi.string(),
            DATABASE: Joi.string(),
        });

        const { error, value: validatedEnvConfig } = envVarsSchema.validate(
            envConfig,
        );
        if (error) {
            throw new Error(`Config validation error: ${error.message}`);
        }
        return validatedEnvConfig;
    }

    get port(): string {
        return String(this.envConfig.PORT);
    }
    get host(): string {
        return String(this.envConfig.HOST);
    }
    get username(): string {
        return String(this.envConfig.USERNAME);
    }
    get password(): string {
        return String(this.envConfig.PASSWORD);
    }
    get database(): string {
        return String(this.envConfig.DATABASE);
    }
}

这是我的config/config.module.ts

import { Module } from '@nestjs/common';
import { ConfigService } from './config.service';

@Module({
  providers: [{
    provide: ConfigService,
    useValue: new ConfigService(`${process.env.NODE_ENV || 'development'}.env`),
  }],
  exports: [ConfigService],
})
export class ConfigModule {}

useFacetory选项是产生错误的选项，但我不明白为什么我会感谢任何人的帮助

Answer 1

所以问题是，当我试图从.env文件获取端口时，必须将类型转换为数字。示例：

useFactory: async (configService: ConfigService) => ({
  type: 'mysql',
  port: Number(configService.port),
  username: configService.username,
  password: configService.password,
  database: configService.database,
  host: configService.host,
  entities: [__dirname + '/**/*.entity{.ts,.js}'],
  synchronize: true,
}),

这就解决了问题