Function simulateEventDispatch

packages/internal-test-utils/ReactInternalTestUtils.js:348–379

(
  node: Node,
  eventType: string,
)

// between each event handler. This will allow discrete events to
// flush between events across different event handlers.
export async function simulateEventDispatch(
  node: Node,
  eventType: string,
): Promise<void> {
  // Ensure the node is in the document.
  for (let current = node; current; current = current.parentNode) {
    if (current === document) {
      break;
    } else if (current.parentNode == null) {
      return;
    }
  }

  const customEvent = new Event(eventType, {
    bubbles: true,
  });

  Object.defineProperty(customEvent, 'target', {
    // Override the target to the node on which we dispatched the event.
    value: node,
  });

  const impl = Object.getOwnPropertySymbols(node)[0];
  const oldDispatch = node[impl].dispatchEvent;
  try {
    node[impl].dispatchEvent = simulateBrowserEventDispatch;

    await node.dispatchEvent(customEvent);
  } finally {
    node[impl].dispatchEvent = oldDispatch;
  }
}