33 lines
1.0 KiB
JavaScript
33 lines
1.0 KiB
JavaScript
/*
|
|
Copyright 2019 Google LLC
|
|
|
|
Use of this source code is governed by an MIT-style
|
|
license that can be found in the LICENSE file or at
|
|
https://opensource.org/licenses/MIT.
|
|
*/
|
|
import './_version.js';
|
|
/**
|
|
* Sends a data object to a service worker via `postMessage` and resolves with
|
|
* a response (if any).
|
|
*
|
|
* A response can be set in a message handler in the service worker by
|
|
* calling `event.ports[0].postMessage(...)`, which will resolve the promise
|
|
* returned by `messageSW()`. If no response is set, the promise will not
|
|
* resolve.
|
|
*
|
|
* @param {ServiceWorker} sw The service worker to send the message to.
|
|
* @param {Object} data An object to send to the service worker.
|
|
* @return {Promise<Object|undefined>}
|
|
* @memberof module:workbox-window
|
|
*/
|
|
function messageSW(sw, data) {
|
|
return new Promise((resolve) => {
|
|
const messageChannel = new MessageChannel();
|
|
messageChannel.port1.onmessage = (event) => {
|
|
resolve(event.data);
|
|
};
|
|
sw.postMessage(data, [messageChannel.port2]);
|
|
});
|
|
}
|
|
export { messageSW };
|