Fixture.ts

import { ComponentClass, ComponentType, Ref } from 'react';

export type Fixture<T extends ComponentType<any>> = {
  component: T;
  init?: (arg: { compRef: Ref<T> }) => Promise<any>;
  name?: string;
  namespace?: string;
  props: T extends ComponentType<infer X> ? X : never;
  state?: T extends ComponentClass<any, infer S> ? S : never;
};

export function createFixture<T extends ComponentType<any>>(
  fixture: Fixture<T>
): Fixture<T> {
  return fixture;
}