Top-level type annotation failed

Reproduce:

```js
/** This annotation not  be include */
type Shape2 = { kind: string; size: number };
```

```json
{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "properties": {
        "kind": {
            "type": "string"
        },
        "size": {
            "type": "number"
        }
    },
    "type": "object"
}
```

The annotation was given up.