query in deletemany位于this的_conditions键处，因此您可以在Post Model中这样做，例如：

postSchema.pre('deleteMany', async function (next: NextFunction) {
  try {
   let deletedData =await Post.find(this._conditions).lean()
    console.log(deletedData );
    return next(); // normal save
  } catch (error) {
    return next(error);
  }
});

let Post= mongoose.model("Post", userSchema);
module.exports = Post

this.getFilter()和this.getUpdate()是访问中间件中参数的推荐方法

postSchema.pre('deleteMany', async function (next: NextFunction) {
  try {
   let deletedData =await Post.find(this.getFilter()).lean()
    console.log(deletedData );
    next(); // are you sure you want return next() and not next()?
  } catch (error) {
    next(error); // are you sure you want return next(error) and not next(error)?
  }
});

let Post= mongoose.model("Post", userSchema);
module.exports = Post

链接到有关访问中间件的Mongoose文档