@wordpress/e2e-test-utils/build-module/observe-focus-loss.js

End-To-End (E2E) test utils for WordPress.

/**
 * Adds an event listener to the document which throws an error if there is a
 * loss of focus.
 */
export async function enableFocusLossObservation() {
  await page.evaluate(() => {
    if (window._detectFocusLoss) {
      document.body.removeEventListener('focusout', window._detectFocusLoss);
    }
    window._detectFocusLoss = event => {
      if (!event.relatedTarget) {
        throw new Error('Unexpected focus loss');
      }
    };
    document.body.addEventListener('focusout', window._detectFocusLoss);
  });
}

/**
 * Removes the focus loss listener that `enableFocusLossObservation()` adds.
 */
export async function disableFocusLossObservation() {
  await page.evaluate(() => {
    if (window._detectFocusLoss) {
      document.body.removeEventListener('focusout', window._detectFocusLoss);
    }
  });
}
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