Invalid type is generated in case of union type including object type

[sakai-akinobu]

Converting the following definitions

{
  "id": "Foo",
  "type": ["object", "null"],
  "properties": {
    "bar":  {
      "type": "string"
    }
  }
}

The following values ​​are returned.

export type Foo = {
  bar?: string
} | {
  bar?: string
};

I think that the type definitions below should be returned correctly.

export type Foo = {
  bar?: string
} | null;

I wrote the reproduction code.

https://github.com/sakai-akinobu/investigation-of-json-schema-to-flow-type-with-union-type

environment

• json-schema-to-flow-type@1.0.0