Typescript doesn't generate correct types when root element is an array of objects

When using this JSON Schema as a source:
```json
{
"$schema": "http://json-schema.org/draft-07/schema#",
"$id": "pr.json",
"$ref": "#/definitions/GetResp",
"definitions": {
"GetResp": {
"title": "GetResp",
"type": "array",
"items": {
"$ref": "#/definitions/SomeObject"
}
},
"SomeObject": {
"title": "SomeObject",
"type": "object",
"additionalProperties": false,
"properties": {
"name": {
"type": "string"
}
},
"required": [
"name"
]
}
}
}
```

When I generate Golang types, I get expected result:

```go
type GetResp []SomeObject

type SomeObject struct {
Name string `json:"name"`
}
```

While TypeScript output is:

```typescript
export interface GetResp {
name: string;
}
```

I expect it to generate:

```typescript
export interface SomeObject {
name: string;
}

export type GetResp = SomeObject[]
```