Cannot create a schema with a subdocument containing the key "type"

[JavaScriptBach]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the bug has not already been reported

Mongoose version

7.0.1

Node.js version

18

MongoDB server version

4.4

Typescript version (if applicable)

No response

Description

I can't create a schema with a subdocument containing the key "type". See below for examples

Steps to Reproduce

This code fails to create a schema:

const TestSchema = {
  action: {
    $type: {
      type: {
        $type: String,
        required: true,
      },
    },
    required: true
  },
};
const s = new Schema(TestSchema, { typeKey: "$type" });

The intention is to produce a document type like this:

{
  action: {
    type: String
  }
}

It gives the error:

Uncaught:
TypeError: Invalid schema configuration: `true` is not a valid type at path `required`. See https://bit.ly/mongoose-schematypes for a list of valid schema types.

Expected Behavior

Schema should successfully get created

[IslandRhythms]

You have the option to use the working version until the issue is resolved.

const mongoose = require('mongoose');
const { Schema } = mongoose;

console.log('works');

const testSchema = new Schema({
  action: {
    type: {
      type: String,
      required: true
    },
  },
  name: {
    type: String,
    required: true
  }
})

const Test = mongoose.model('Test', testSchema);

console.log('does not work');

const TestSchema = {
  action: {
    $type: {
      type: {
        $type: String,
        required: true,
      },
    },
    required: true
  },
};


const s = new Schema(TestSchema, { typeKey: "$type" });

const S = mongoose.model('S', s);

[JavaScriptBach]

Thanks @IslandRhythms, but it looks like your alternative schema wouldn't have the same behavior as action doesn't have the required validator set. Looking forward to the fix. Would it also be possible to backport the fix to Mongoose 6 when it's completed?