Schemas where index is an object fail to compile in Mongoose 6.6.5

[FlameWolf]

Prerequisites

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

Mongoose version

6.6.5

Node.js version

18.2.0

MongoDB server version

4.10.0

Typescript version (if applicable)

4.8.4

Description

I have a schema in my application that contains a partialFilterExpression inside an index. It was working fine until I upgraded Mongoose from 6.6.2 to 6.6.5. Now it fails to compile with TS 2322 errors on all the properties. But it will work fine if I remove the partial index specification. This happens with another model that contains a text index too, where the index is specified like index: { text: true, ... }.

Steps to Reproduce

Try commenting/uncommenting the index specification on the email field.

"use strict";

import { Schema, model } from "mongoose";

const userSchema = new Schema(
	{
		handle: {
			type: String,
			trim: true,
			required: true,
			unique: true,
			uniqueCaseInsensitive: true,
			index: true
		},
		password: {
			type: String,
			trim: true,
			required: true,
			select: false
		},
		email: {
			type: String,
			trim: true,
			index: {
				partialFilterExpression: {
					email: {
						$exists: true,
						$ne: null
					}
				}
			},
			select: false
		}
	},
	{
		timestamps: true,
		collation: {
			locale: "en",
			strength: 2
		}
	}
);

export default model("User", userSchema);

Expected Behavior

The schema should compile without errors.

[IslandRhythms]

Thats weird

"use strict";

import { Schema, model } from "mongoose";

const emailRegExp = /@/
const userSchema = new Schema(
	{
		handle: {
			type: String,
			trim: true,
			required: true,
			unique: true,
			uniqueCaseInsensitive: true,
			index: true
		},
		password: {
			type: String,
			trim: true,
			required: true,
			select: false
		},
		email: {
			type: String,
			trim: true,
			validate: {
				validator: (value: string) => emailRegExp.test(value),
				message: "Email is not valid"
			},
			index: { // uncomment the index object and for me trim was throwing an error
				partialFilterExpression: {
					email: {
						$exists: true,
						$ne: null
					}
				}
			},
			select: false
		}
	},
	{
		timestamps: true,
		collation: {
			locale: "en",
			strength: 2
		}
	}
);

export default model("User", userSchema);