Function waitFor

packages/core/rxjs-interop/test/rx_resource_spec.ts:407–411

(fn: () => boolean)

});

async function waitFor(fn: () => boolean): Promise<void> {
  while (!fn()) {
    await timeout(1);
  }
}

function flushMicrotasks(): Promise<void> {
  return new Promise((resolve) => setTimeout(resolve, 0));