Function messageParent

packages/jest-worker/src/workers/messageParent.ts:14–49

(
  message: unknown,
  parentProcess = process,
)

import {packMessage} from './safeMessageTransferring';

export default function messageParent(
  message: unknown,
  parentProcess = process,
): void {
  if (!isMainThread && parentPort != null) {
    try {
      parentPort.postMessage([PARENT_MESSAGE_CUSTOM, message]);
    } catch (error) {
      // Try to handle https://html.spec.whatwg.org/multipage/structured-data.html#structuredserializeinternal
      // for `symbols` and `functions`
      if (isDataCloneError(error)) {
        parentPort.postMessage([PARENT_MESSAGE_CUSTOM, packMessage(message)]);
      } else {
        throw error;
      }
    }
  } else if (typeof parentProcess.send === 'function') {
    try {
      parentProcess.send([PARENT_MESSAGE_CUSTOM, message]);
    } catch (error) {
      if (
        isError(error) &&
        // if .send is a function, it's a serialization issue
        !error.message.includes('.send is not a function')
      ) {
        // Apply specific serialization only in error cases
        // to avoid affecting performance in regular cases.
        parentProcess.send([PARENT_MESSAGE_CUSTOM, packMessage(message)]);
      } else {
        throw error;
      }
    }
  } else {
    throw new TypeError('"messageParent" can only be used inside a worker');
  }
}