How to reference instance of factory created class in Typescript? Cannot find name error

Question

Typescript is failing to reference factory created class. Here's an example code:

// factory.ts
export const createClass = () =>
  class Model {
    // ...
  }

// ModelA.ts
import {createClass} from './factory';

export const ModelA = createClass();

let a: ModelA; // Cannot find name 'ModelA';

// other.ts
import {ModelA} from './ModelA';
new ModelA() // Cannot find name 'ModelA';

What am I doing wrong here?

Answer 1

If you are trying to get the insurance type for the class generated by the function then you can use the InstanceType conditional type.

export const createClass = () =>
class Model {
    // ...
}


export const ModelA = createClass();
type ModelA = InstanceType<typeof ModelA>
let a: ModelA = new ModelA(); // ok