Generator hangs at a recursive type in methods definition

[rhysd]

Describe the bug

I have an API method which returns a tree structure. I created a definition file with describing the recursive type in JSON schema and I tried this code generator. And the generator instantly hung.

To Reproduce
Steps to reproduce the behavior:

1. Put the following JSON content as openrpc.json in your current directory
2. npm i @open-rpc/generator
3. npx open-rpc-generator init
4. The command hangs at the first question. npx open-rpc-generator generate hangs as well

{
  "openrpc": "1.3.2",
  "info": {
    "version": "0.0.0",
    "title": "My API"
  },
  "methods": [
    {
      "name": "getTree",
      "description": "",
      "params": [],
      "result": {
        "name": "tree",
        "description": "",
        "schema": { "$ref": "#/components/schemas/Node" }
      }
    }
  ],
  "components": {
    "schemas": {
      "Node": {
        "type": "object",
        "properties": {
          "id": { "type": "integer" },
          "children": {
            "type": "array",
            "items": { "$ref": "#/components/schemas/Node" }
          }
        }
      }
    }
  }
}

Expected behavior

The npx open-rpc-generator init creates a configuration file for the project.

Screenshots

Instead of screenshot I captured terminal screen outputs:

> npx open-rpc-generator init
? Where is your OpenRPC document? May be a file path or url. (openrpc.json)

The command hung at the first question.

Desktop (please complete the following information):

• @open-rpc/generator: v1.22.3
• OS: Windows 10
• Browser: N/A
• Version: Node.js v18.20.0

Additional context

When I modified the children field as follows, this issue didn't occur.

"children": {
  "type": "array",
  "items": { "type": "object" }
}

I believe the recursive type made the generator hang. I guess the generator checks $ref recursively without checking the reference is already visit.