sw-6.js

self.onactivate = function(event) {
    var keepList = ['static-v1'];
 
    event.waitUntil(
        caches.keys().then(function(cacheNameList) {
            return Promise.all(cacheNameList.map(function(cacheName) { 
                if (keepList.indexOf(cacheName) === -1) {
                    return caches.delete(cacheName);
                }
            }));
        })
    );
}

Hi, can you tell me please what cacheNameList is? is an API object or a variable defined by you? Thanks