representing the message to send.
 *        If this is a string, it will be expanded into an object with the string as the
 *        `type` field.  If this is an object, it will be sent as is.
 */
function post(win, typeOrMessage) {
  // When running unit tests on XPCShell, there is no window to send messages to.
  if (!win) {
    return;
  }

  let message = typeOrMessage;
  if (typeof typeOrMessage == "string") {
    message = {
      type: typeOrMessage,
    };
  }
  win.postMessage(message, "*");
}

function request(win, type) {
  const done = wait(win, type + REQUEST_DONE_SUFFIX);
  post(win, type);
  return done;
}

exports.wait = wait;
exports.post = post;
exports.request = request;
PK