Typescript typings for parent/child class methods

[dusk pier]

I'm creating mini orm in my pet-project.
Trying to do models usable in IDE and compiler, but stuck with typing problems.I have base model class:
https://github.com/kricha/ts_q/blob/main/src/Models/BaseModel.ts
And child class:

import { BaseModel } from './BaseModel';
export class User extends BaseModel {
  static _table = 'users';

  static _pk = 'id';

  id: number;

  email: string;

  password: string;

  // eslint-disable-next-line @typescript-eslint/no-useless-constructor
  constructor(props: { id?: number; email: string; password: string }) {
    super(props);
  }
}

static method from base class works good, but after adding create method I'm getting error while compile... Errors described in comments in code.One more error could be achieved with code:

new User({ email: '[email protected]', password: '123123' }).create().then((user) => {//TS2684: The 'this' context of type 'User' is not assignable to method's 'this' of type 'typeof BaseModel'.   Type 'User' is missing the following properties from type 'typeof BaseModel': prototype, _pk, _table, findOne, and 2 more
  console.log(user);
});

Don't understand what I'm doing wrong, I do all in analogy with static method.Also full code for experiments available here - https://github.com/kricha/ts_q

[dusk pier]

any thoughts?

[placid bison]

seems like you're mixing up when you want to talk about the type of the static side of a class vs its instance type

the type named BaseModel represents instances of BaseModel (the value you get back after using new). typeof BaseModel is the type of the class object

so for example i suspect create is supposed to be:

create<T extends typeof BaseModel>(this: InstanceType<T>): Promise<InstanceType<T>>