mobx-utils/test/type-tests.ts

import { fromPromise, FULFILLED } from "../src/mobx-utils";

test("just some typings", () => {
  {
    // test typings of fromPromise
    const x = { x: 3 };
    const p = fromPromise(Promise.resolve(x));
    // p.value // compile error!
    if (p.state === FULFILLED) {
      p.value.x = 4; // value only available if state is checked!
    }
  }

  {
    // typings: can create a resolved promise
    const x = { x: 3 };
    const p = fromPromise.resolve(x);
    p.value.x = 7;
  }

  expect(true).toBe(true);
});