Function waitForMutation

test/unit/preact/test-base-element-mapping.js:50–67

(element, callback)

  });

  function waitForMutation(element, callback) {
    return new Promise((resolve) => {
      const mo = new MutationObserver(() => {
        resolve();
        mo.disconnect();
      });
      mo.observe(element, {
        attributes: true,
        childList: true,
        subtree: true,
        characterData: true,
      });
      callback();
    }).then(() => {
      // Skip couple more animation frames.
      return new Promise((resolve) => setTimeout(resolve, 32));
    });
  }

  describe('R1', () => {
    it('testElementR1', () => {