pinafore/templates/main.js

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import { init } from 'sapper/runtime.js'
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import {
importURLSearchParams,
importIntersectionObserver,
importRequestIdleCallback
} from '../routes/_utils/asyncModules'
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// polyfills
Promise.all([
typeof URLSearchParams === 'undefined' && importURLSearchParams(),
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typeof IntersectionObserver === 'undefined' && importIntersectionObserver(),
typeof requestIdleCallback === 'undefined' && importRequestIdleCallback()
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]).then(() => {
// `routes` is an array of route objects injected by Sapper
init(document.querySelector('#sapper'), __routes__)
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if (navigator.serviceWorker && navigator.serviceWorker.controller) {
navigator.serviceWorker.controller.onstatechange = (e) => {
if (e.target.state === 'redundant') {
importToast().then(toast => toast.say('App update available. Reload to update.'));
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}
}
}
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})