Question

我是TypeScript的新手，我正在将现有项目迁移到它。在我的中间件函数（位于单独的文件上）上，有以下函数：

const checkCampgroundOwnership = async (
  req: Request,
  res: Response,
  next: NextFunction
) => {
  if (req.user && req.isAuthenticated()) {
    try {
      const foundCampground = await Campground.findById(req.params.id);

      // does user own the campground?
      if (foundCampground && foundCampground.author.id == req.user._id) {
        next();
      } else {
        req.flash("error", "You don't have permission to do that");
        res.redirect("back");
      }
    } catch (err) {
      req.flash("error", "Campground not found");
      return res.redirect("back");
    }
  } else {
    req.flash("error", "You need to be logged in to do that");
    return res.redirect("back");
  }
};

在第11行上，当我检查是否有FoundCampground时，我在“ req.user._id”上遇到了此错误：Property '_id' does not exist on type 'User'。

在我的server.ts上，我有这个：

app.use((req, res, next) => {
  res.locals.currentUser = req.user;
  res.locals.error = req.flash("error");
  res.locals.success = req.flash("success");
  next();
});

我能做什么？

Answer 1

我的解决方案：

创建一个.d.ts文件并根据需要自定义！我的版本：

declare namespace NodeJS {
  export interface ProcessEnv {
    MONGO_URI: string;
    GOOGLE_API: string;
    SECRET_KEY: string;
  }
}

declare namespace Mytypes {
  export interface User extends Express.User{
    _id: string;
    username: string;
    isAdmin: boolean;
  }
  export interface ICustomRequest<T> extends Express.Request {
    body: T;
    params: {
      id: string;
      comment_id: string;
    };
  }
}

如何扩展此用户界面？

1 个答案: