Generation of Folder with TypeScript as output ignores -s schema

I am currently trying to generate typescript files from a folder of json schemas. However instead of recognizing the input as a json schema (with -s set explicitly) the input is determined as json and

```sh
quicktype -s schema ./schemas -o ./types/index.ts --just-types
```

results in

```ts
export interface MyInterface {
$schema: string;
$id: string;
title: string;
description: string;
properties: Properties;
}
```

When I process each file individually I don't have this problem.