import { extendPrototype } from 'localforage-removeitems'; declare let localforage: LocalForage; namespace LocalForageGetItemsTest { { let localforage2: LocalForageWithRemoveItems = extendPrototype(localforage); } { let itemsPromise: Promise = localforage.removeItems([ 'a', 'b', 'c' ]); itemsPromise.then(() => { console.log('Done'); }); } }