Function waitForProp

test/unit/preact/test-base-element-runtime.js:72–80

(element, prop, targetValue)

  });

  function waitForProp(element, prop, targetValue) {
    return new Promise((resolve) => {
      subscribe(element, [prop], (value) => {
        if (value == targetValue) {
          resolve();
        }
      });
    });
  }

  it('preact ref passing vnode smoke test', () => {
    function App() {