TypeScript insertMany return type isn't an array

[ahmedelshenawy25]

Do you want to request a feature or report a bug?
Bug
What is the current behavior?
insertMany return type isn't an array

Property 'map' does not exist on type 'Document<any, any, IBook> & IBook & { _id: ObjectId; }'

If the current behavior is a bug, please provide the steps to reproduce.

import mongoose from 'mongoose';

interface IBook {
  name: string;
}

async function run() {
  await mongoose.connect('mongodb://localhost:27017/test');

  const bookSchema = new mongoose.Schema<IBook>({
    name: String
  });

  const Book = mongoose.model<IBook>('Book', bookSchema);

  const books = await Book.insertMany({ name: 'aaaa' });
  console.log(Array.isArray(books)); // true
  books.map(book => console.log(book));
}

run().catch(console.error);

{
  "compilerOptions": {
    "target": "ES6",
    "module": "commonjs",
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,
    "strict": true,
    "skipLibCheck": true
  }
}

What is the expected behavior?
insertMany return type should be an array
What are the versions of Node.js, Mongoose and MongoDB you are using? Note that "latest" is not a version.
Node.js: v14.15.5
Mongoose: v6.0.8
MongoDB: v4.4.3