Describe the bug.

A valid AsyncAPI document containing a circular schema inside an array tuple causes Modelina to crash at runtime with:

RangeError: Maximum call stack size exceeded

The crash occurs in AsyncAPIInputProcessor.convertToInternalSchema because the recursion guard (alreadyIteratedSchemas) is not propagated when iterating over schema.items() using Array.map().

As a result, circular schemas inside tuple-based arrays are processed with a fresh recursion state on every iteration, leading to infinite recursion.

This affects both CLI and programmatic usage and can be triggered by valid real-world schemas.

Expected behavior

Modelina should safely process circular schemas (including tuple-based arrays) without crashing, using the existing recursion guard to prevent infinite recursion.

Screenshots

Not applicable — this is a runtime crash.

How to Reproduce

1. Create the following AsyncAPI document:

asyncapi: 2.6.0
info:
  title: Circular Array Crash Repro
  version: 1.0.0

channels:
  test/channel:
    publish:
      message:
        payload:
          type: array
          items:
            - $ref: '#/components/schemas/Node'
            - $ref: '#/components/schemas/Node'

components:
  schemas:
    Node:
      type: object
      properties:
        children:
          type: array
          items:
            - $ref: '#/components/schemas/Node'

2. Run Modelina programmatically:

const { TypeScriptGenerator } = require('@asyncapi/modelina');


await new TypeScriptGenerator().generate(doc);

3. Observe the runtime crash:

RangeError: Maximum call stack size exceeded

🖥️ Device Information [optional]

• Operating System (OS): macOS
• Browser: (N/A)
• Browser Version: (N/A)

👀 Have you checked for similar open issues?

• I checked and didn't find similar issue

🏢 Have you read the Contributing Guidelines?

• I have read the Contributing Guidelines

Are you willing to work on this issue ?

Yes I am willing to submit a PR!