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