importScripts('https://cdn.ampproject.org/sw/amp-sw.js');
AMP_SW.init({
assetCachingOptions: [{
regexp: /\.(png|jpg|jpeg|gif|webp|svg|ico|woff2|woff|ttf|otf|js|txt|css|php|html|htm|mp4|mp3|pdf|map)/,
cachingStrategy: 'CACHE_FIRST'
}]
});