Clears out all the indexedDB databases

clear-all-indexedDB.js

indexedDB.databases().then(dbs => {
    var promises = dbs.map(db => {
        return new Promise((resolve, reject) => {
            var req = indexedDB.deleteDatabase(db.Name);
            req.onsuccess = resolve;
            req.onerror = reject;
            req.onblocked = reject;
        });
    });
    Promise.all(promises).then(console.log).catch(console.error);
})