send-channel-message/lib/index.js

Simple function that allow to pass messages to separate script in different browsing context and get back result data as a Promise.

"use strict";

exports.__esModule = true;
exports.default = void 0;

var checkInputsIsInvalid = function checkInputsIsInvalid(message, target) {
  if (!(target && typeof target.postMessage === 'function')) {
    return new Error('Error! Invalid target.');
  }

  if (!message) {
    return new Error('Error! Invalid message.');
  }

  return null;
};

var sendChannelMessage = function sendChannelMessage(message, target) {
  var origin = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : '*';
  return new Promise(function (resolve, reject) {
    var error = checkInputsIsInvalid(message, target);

    if (error) {
      reject(error);
    }

    var _ref = new MessageChannel(),
        port1 = _ref.port1,
        port2 = _ref.port2;

    port1.onmessage = function (evt) {
      port1.close();
      resolve(evt.data);
    };

    target.postMessage(message, origin, [port2]);
  });
};

var _default = sendChannelMessage;
exports.default = _default;