git ssb

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/* eslint-env serviceworker */
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var VERSION = require('./package.json').version
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var URLS = process.env.FILE_LIST
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// Respond with cached resources
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self.addEventListener('fetch', function (e) {
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  e.respondWith(self.caches.match(e.request).then(function (request) {
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    if (request) return request
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    else return self.fetch(e.request)
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  }))
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})
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// Register worker
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self.addEventListener('install', function (e) {
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  e.waitUntil(self.caches.open(VERSION).then(function (cache) {
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    return cache.addAll(URLS)
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  }))
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})
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// Remove outdated resources
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self.addEventListener('activate', function (e) {
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  e.waitUntil(self.caches.keys().then(function (keyList) {
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    return Promise.all(keyList.map(function (key, i) {
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      if (keyList[i] !== VERSION) return self.caches.delete(keyList[i])
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    }))
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  }))
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})
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