Service workers

if ('serviceWorker' in var navigator: Navigator
MDN Reference
navigator) {
	function addEventListener<"load">(type: "load", listener: (this: Window, ev: Event) => any, options?: boolean | AddEventListenerOptions): void (+1 overload)addEventListener('load', function () {
		var navigator: Navigator
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navigator.Navigator.serviceWorker: ServiceWorkerContainer
Available only in secure contexts.
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serviceWorker.ServiceWorkerContainer.register(scriptURL: string | URL, options?: RegistrationOptions): Promise<ServiceWorkerRegistration>
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register('./path/to/service-worker.js');
	});
}

/// <reference types="@sveltejs/kit" />
import { const build: string[]
An array of URL strings representing the files generated by Vite, suitable for caching with cache.addAll(build).
During development, this is an empty array.
build, const files: string[]
An array of URL strings representing the files in your static directory, or whatever directory is specified by config.kit.files.assets. You can customize which files are included from static directory using config.kit.serviceWorker.files
files, const version: string
See config.kit.version. It’s useful for generating unique cache names inside your service worker, so that a later deployment of your app can invalidate old caches.
version } from '$service-worker';

// Create a unique cache name for this deployment
const const CACHE: stringCACHE = `cache-${const version: string
See config.kit.version. It’s useful for generating unique cache names inside your service worker, so that a later deployment of your app can invalidate old caches.
version}`;

const const ASSETS: string[]ASSETS = [
	...const build: string[]
An array of URL strings representing the files generated by Vite, suitable for caching with cache.addAll(build).
During development, this is an empty array.
build, // the app itself
	...const files: string[]
An array of URL strings representing the files in your static directory, or whatever directory is specified by config.kit.files.assets. You can customize which files are included from static directory using config.kit.serviceWorker.files
files  // everything in `static`
];

var self: Window & typeof globalThis
MDN Reference
self.function addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void (+1 overload)
Appends an event listener for events whose type attribute value is type. The callback argument sets the callback that will be invoked when the event is dispatched.
The options argument sets listener-specific options. For compatibility this can be a boolean, in which case the method behaves exactly as if the value was specified as options’s capture.
When set to true, options’s capture prevents callback from being invoked when the event’s eventPhase attribute value is BUBBLING_PHASE. When false (or not present), callback will not be invoked when event’s eventPhase attribute value is CAPTURING_PHASE. Either way, callback will be invoked if event’s eventPhase attribute value is AT_TARGET.
When set to true, options’s passive indicates that the callback will not cancel the event by invoking preventDefault(). This is used to enable performance optimizations described in § 2.8 Observing event listeners.
When set to true, options’s once indicates that the callback will only be invoked once after which the event listener will be removed.
If an AbortSignal is passed for options’s signal, then the event listener will be removed when signal is aborted.
The event listener is appended to target’s event listener list and is not appended if it has the same type, callback, and capture.
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addEventListener('install', (event: Eventevent) => {
	// Create a new cache and add all files to it
	async function function (local function) addFilesToCache(): Promise<void>addFilesToCache() {
		const const cache: Cachecache = await var caches: CacheStorage
Available only in secure contexts.
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caches.CacheStorage.open(cacheName: string): Promise<Cache>
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open(const CACHE: stringCACHE);
		await const cache: Cachecache.Cache.addAll(requests: Iterable<RequestInfo>): Promise<void> (+1 overload)
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addAll(const ASSETS: string[]ASSETS);
	}

	event: Eventevent.waitUntil(function (local function) addFilesToCache(): Promise<void>addFilesToCache());
});

var self: Window & typeof globalThis
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self.function addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void (+1 overload)
Appends an event listener for events whose type attribute value is type. The callback argument sets the callback that will be invoked when the event is dispatched.
The options argument sets listener-specific options. For compatibility this can be a boolean, in which case the method behaves exactly as if the value was specified as options’s capture.
When set to true, options’s capture prevents callback from being invoked when the event’s eventPhase attribute value is BUBBLING_PHASE. When false (or not present), callback will not be invoked when event’s eventPhase attribute value is CAPTURING_PHASE. Either way, callback will be invoked if event’s eventPhase attribute value is AT_TARGET.
When set to true, options’s passive indicates that the callback will not cancel the event by invoking preventDefault(). This is used to enable performance optimizations described in § 2.8 Observing event listeners.
When set to true, options’s once indicates that the callback will only be invoked once after which the event listener will be removed.
If an AbortSignal is passed for options’s signal, then the event listener will be removed when signal is aborted.
The event listener is appended to target’s event listener list and is not appended if it has the same type, callback, and capture.
MDN Reference
addEventListener('activate', (event: Eventevent) => {
	// Remove previous cached data from disk
	async function function (local function) deleteOldCaches(): Promise<void>deleteOldCaches() {
		for (const const key: stringkey of await var caches: CacheStorage
Available only in secure contexts.
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caches.CacheStorage.keys(): Promise<string[]>
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keys()) {
			if (const key: stringkey !== const CACHE: stringCACHE) await var caches: CacheStorage
Available only in secure contexts.
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caches.CacheStorage.delete(cacheName: string): Promise<boolean>
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delete(const key: stringkey);
		}
	}

	event: Eventevent.waitUntil(function (local function) deleteOldCaches(): Promise<void>deleteOldCaches());
});

var self: Window & typeof globalThis
MDN Reference
self.function addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void (+1 overload)
Appends an event listener for events whose type attribute value is type. The callback argument sets the callback that will be invoked when the event is dispatched.
The options argument sets listener-specific options. For compatibility this can be a boolean, in which case the method behaves exactly as if the value was specified as options’s capture.
When set to true, options’s capture prevents callback from being invoked when the event’s eventPhase attribute value is BUBBLING_PHASE. When false (or not present), callback will not be invoked when event’s eventPhase attribute value is CAPTURING_PHASE. Either way, callback will be invoked if event’s eventPhase attribute value is AT_TARGET.
When set to true, options’s passive indicates that the callback will not cancel the event by invoking preventDefault(). This is used to enable performance optimizations described in § 2.8 Observing event listeners.
When set to true, options’s once indicates that the callback will only be invoked once after which the event listener will be removed.
If an AbortSignal is passed for options’s signal, then the event listener will be removed when signal is aborted.
The event listener is appended to target’s event listener list and is not appended if it has the same type, callback, and capture.
MDN Reference
addEventListener('fetch', (event: Eventevent) => {
	// ignore POST requests etc
	if (event: Eventevent.request.method !== 'GET') return;

	async function function (local function) respond(): Promise<Response>respond() {
		const const url: URLurl = new var URL: new (url: string | URL, base?: string | URL) => URL
The URL interface represents an object providing static methods used for creating object URLs.
MDN Reference
URL class is a global reference for require('url').URL
https://nodejs.org/api/url.html#the-whatwg-url-api
@sincev10.0.0URL(event: Eventevent.request.url);
		const const cache: Cachecache = await var caches: CacheStorage
Available only in secure contexts.
MDN Reference
caches.CacheStorage.open(cacheName: string): Promise<Cache>
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open(const CACHE: stringCACHE);

		// `build`/`files` can always be served from the cache
		if (const ASSETS: string[]ASSETS.Array<string>.includes(searchElement: string, fromIndex?: number): boolean
Determines whether an array includes a certain element, returning true or false as appropriate.
@paramsearchElement The element to search for.
@paramfromIndex The position in this array at which to begin searching for searchElement.includes(const url: URLurl.URL.pathname: string
MDN Reference
pathname)) {
			const const response: Response | undefinedresponse = await const cache: Cachecache.Cache.match(request: RequestInfo | URL, options?: CacheQueryOptions): Promise<Response | undefined>
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match(const url: URLurl.URL.pathname: string
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pathname);

			if (const response: Response | undefinedresponse) {
				return const response: Responseresponse;
			}
		}

		// for everything else, try the network first, but
		// fall back to the cache if we're offline
		try {
			const const response: Responseresponse = await function fetch(input: string | URL | globalThis.Request, init?: RequestInit): Promise<Response> (+1 overload)
MDN Reference
fetch(event: Eventevent.request);

			// if we're offline, fetch can return a value that is not a Response
			// instead of throwing - and we can't pass this non-Response to respondWith
			if (!(const response: Responseresponse instanceof 
var Response: {
    new (body?: BodyInit | null, init?: ResponseInit): Response;
    prototype: Response;
    error(): Response;
    json(data: any, init?: ResponseInit): Response;
    redirect(url: string | URL, status?: number): Response;
}
This Fetch API interface represents the response to a request.
MDN Reference
Response)) {
				throw new 
var Error: ErrorConstructor
new (message?: string, options?: ErrorOptions) => Error (+1 overload)Error('invalid response from fetch');
			}

			if (const response: Responseresponse.Response.status: number
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status === 200) {
				const cache: Cachecache.Cache.put(request: RequestInfo | URL, response: Response): Promise<void>
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put(event: Eventevent.request, const response: Responseresponse.Response.clone(): Response
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clone());
			}

			return const response: Responseresponse;
		} catch (function (local var) err: unknownerr) {
			const const response: Response | undefinedresponse = await const cache: Cachecache.Cache.match(request: RequestInfo | URL, options?: CacheQueryOptions): Promise<Response | undefined>
MDN Reference
match(event: Eventevent.request);

			if (const response: Response | undefinedresponse) {
				return const response: Responseresponse;
			}

			// if there's no cache, then just error out
			// as there is nothing we can do to respond to this request
			throw function (local var) err: unknownerr;
		}
	}

	event: Eventevent.respondWith(function (local function) respond(): Promise<Response>respond());
});

import { const dev: boolean
Whether the dev server is running. This is not guaranteed to correspond to NODE_ENV or MODE.
dev } from '$app/environment';

var navigator: Navigator
MDN Reference
navigator.Navigator.serviceWorker: ServiceWorkerContainer
Available only in secure contexts.
MDN Reference
serviceWorker.ServiceWorkerContainer.register(scriptURL: string | URL, options?: RegistrationOptions): Promise<ServiceWorkerRegistration>
MDN Reference
register('/service-worker.js', {
	RegistrationOptions.type?: WorkerType | undefinedtype: const dev: boolean
Whether the dev server is running. This is not guaranteed to correspond to NODE_ENV or MODE.
dev ? 'module' : 'classic'
});

/// <reference types="@sveltejs/kit" />
/// <reference no-default-lib="true"/>
/// <reference lib="esnext" />
/// <reference lib="webworker" />

const sw = /** @type {ServiceWorkerGlobalScope} */ (/** @type {unknown} */ (self));

/// <reference types="@sveltejs/kit" />
/// <reference no-default-lib="true"/>
/// <reference lib="esnext" />
/// <reference lib="webworker" />

const sw = self as unknown as ServiceWorkerGlobalScope;