Use the console.
Try this:
ls = new LocalSync()
console.log('setBucket =>', ls.setBucket('BikiniBottom'))
console.log('set =>', ls.set('bob', {name: 'SpongeBob'}))
console.log('get =>', ls.get('bob'))
console.log('set =>', ls.set('quotes', ['Squidward!']))
console.log('get =>', ls.get('quotes'))
console.log('put =>', ls.put('bob', {address: '124 Conch Street'}))
console.log('put =>', ls.put('quotes', ['Why so crabby, Patty?']))
console.log('keys =>', ls.keys())
console.log('values =>', ls.values())
console.log('getAll =>', ls.getAll())
console.log('remove =>', ls.remove('bob'))
console.log('keys =>', ls.keys())
console.log('clear =>', ls.clear())
console.log('keys =>', ls.keys())
console.log('--------------------------------------------------------')
console.log('setBucket =>', ls.setBucket('NewBucket'))
console.log('set =>', ls.set('new key', 'new value'))
console.log('setBucket =>', ls.setBucket('FinalBucket'))
console.log('getBucket =>', ls.getBucket())
console.log('allBuckets =>', ls.allBuckets())