Define the data type for the toObject function's return value

Is it possible to define the return type of the toObject method in Mongoose?

When working with generics, you can set properties of a Document object returned from a Mongoose query. However, accessing getters and setters on these objects triggers various validation codes, which may not be desired in certain scenarios.

The Document objects have a toObject method that returns an anonymous object with the type any. I want to specify the type of these objects in the Schema or Model definition so that I don't have to use type assertion every time I execute a query.

My current code snippet looks like this:

import mongoose, { Schema, Document } from 'mongoose'

interface User {
    username: string,
    email:    string,
    password: string,
}

const UserSchema = new Schema({
    username: { type: String, required: true },
    email:    { type: String, required: true },
    password: { type: String, required: true },
})

const UserModel = mongoose.model<User & Document>('User', UserSchema)

export { User, UserModel }

Using the above code, I can perform a query using the following snippet:

const userDocument = await UserModel.findById(id)
const userObj      = userDocument && userDocument.toObject()

While userDocument is of type User extends Document, userObj has the type any. My goal is to change its type to User.

Answer №1

Unfortunately, the toObject method in Mongoose is declared as "any", limiting options to either augmenting the "toObject" method or typing userObj explicitly.

The signature of the toObject method in mongoose typings is as follows:

 toObject(options?: DocumentToObjectOptions): any;

An easy workaround is to execute the following code snippet:

const userObj: undefined | User = userDocument && userDocument.toObject()

I hope this solution is helpful, although it may not be the most ideal. If you have concerns, consider reaching out to Typescript gitter or the DefinitelyTyped mongoose team to address and rectify the typings internally.

Please feel free to reach out if you have any further questions or issues.

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