* The project uses the official s3 client, not the minio client.
* **All methods throw by default** (strict mode):  - Put operations: `fastPut`, `fastPutStream` throw when file exists and overwrite is false  - Get operations: `getBucketByName`, `getFile`, `getSubDirectoryByName` throw when not found
* **Use exists() methods to check before getting**: `bucketExists`, `fileExists`, `directoryExists`, `fastExists`
* **No *Strict methods**: All removed (fastPutStrict, getBucketByNameStrict, getFileStrict, getSubDirectoryByNameStrict)
* metadata is handled though the MetaData class. Important!
* **BucketWatcher** - Polling-based S3 change watcher (`bucket.createWatcher()`). Detects add/modify/delete via ETag/Size/LastModified comparison. Supports RxJS Observable pattern (`changeSubject`) and EventEmitter pattern (`on('change')`). Options: `prefix`, `pollIntervalMs`, `bufferTimeMs`, `includeInitial`, `pageSize`.