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Marcus Junius Brutus's questions

Martin Hope
Marcus Junius Brutus
Asked: 2024-08-21 19:15:33 +0800 CST
  • 5

为什么下面的代码没有经过类型检查（TypeScript 5.5.4）：

    type ValidationResult$Type = 'success' | 'invalid_or_expired_token' 
    export type ValidationResult = {
      type: 'success'
      token_info: object
    } | {
      type: 'invalid_or_expired_token'
    };
    
    const x: ValidationResult = undefined as unknown as ValidationResult;
    
    const {type}: {type: ValidationResult$Type} = x;
    
    switch (type) {
        case 'success':
        const {token_info} = x;
        break;
        case 'invalid_or_expired_token':
        break;
    }

而下面更简单的代码可以做到：

// type ValidationResult$Type = 'success' | 'invalid_or_expired_token' 
export type ValidationResult = {
  type: 'success'
  token_info: object
} | {
  type: 'invalid_or_expired_token'
};

const x: ValidationResult = undefined as unknown as ValidationResult;

// const {type}: {type: ValidationResult$Type} = x;
const {type} = x;

switch (type) {
    case 'success':
    const {token_info} = x;
    break;
    case 'invalid_or_expired_token':
    break;
}

操场

typescript
Martin Hope
Marcus Junius Brutus
Asked: 2024-06-04 23:20:51 +0800 CST
  • 4

我正在尝试记录请求对象（用于调试目的）。我的 NestJS 应用程序使用express（默认选项）。

我在控制器和服务提供者中都获取了请求对象（在后一种情况下注入后）。控制器中的相关部分是：

  // this is the Logger from @nestjs/common
  private readonly logger = new Logger(MessagesController.name);
  
  @Get()
  findAll(@Req() request: Request): string
  {
    this.logger.log(request);
    return this.messagesService.findAll();
  }

服务提供者中的相关部分是：

// the service is request-scoped since it's injected with a request-scoped provider
@Injectable({scope: Scope.REQUEST})
export class MessagesService {

  constructor(@Inject(REQUEST) private request: Request) {
    this.request = request;
  }

  findAll(): string {
    this.logger.log(this.request);
    return "all messages";
  }

}

在两种发生日志记录的情况下（即在控制器和服务中），对象都会简单地记录在控制台上，因为[object Object]这根本没有帮助。如果对的调用this.logger.log(request)被替换为普通的，则console.log(request)该对象会很好地打印在控制台上。

我如何才能Logger很好@nestjs/common地打印这些请求对象？

nestjs