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41 lines
1.5 KiB
41 lines
1.5 KiB
/* |
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Copyright 2018 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 { logger } from 'workbox-core/_private/logger.js'; |
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import { isSupported } from './isSupported.js'; |
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import './_version.js'; |
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/** |
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* If the browser supports Navigation Preload, then this will enable it. |
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* |
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* @param {string} [headerValue] Optionally, allows developers to |
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* [override](https://developers.google.com/web/updates/2017/02/navigation-preload#changing_the_header) |
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* the value of the `Service-Worker-Navigation-Preload` header which will be |
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* sent to the server when making the navigation request. |
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* |
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* @memberof workbox-navigation-preload |
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*/ |
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function enable(headerValue) { |
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if (isSupported()) { |
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self.addEventListener('activate', (event) => { |
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event.waitUntil(self.registration.navigationPreload.enable().then(() => { |
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// Defaults to Service-Worker-Navigation-Preload: true if not set. |
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if (headerValue) { |
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void self.registration.navigationPreload.setHeaderValue(headerValue); |
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} |
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if (process.env.NODE_ENV !== 'production') { |
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logger.log(`Navigation preload is enabled.`); |
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} |
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})); |
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}); |
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} |
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else { |
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if (process.env.NODE_ENV !== 'production') { |
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logger.log(`Navigation preload is not supported in this browser.`); |
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} |
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} |
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} |
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export { enable };
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