cat << 'EOF' > /tmp/s18.yaml
openapi: 3.0.1
info:
  title: Test 18 - Minimal 3.0.1
  version: 1.0.0
servers:
  - url: http://localhost

paths:
  /test:
    get:
      responses:
        "200":
          description: Success
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/TypeA"

components:
  schemas:
    TypeA:
      type: object
      properties:
        name:
          type: string
        next:
          $ref: "#/components/schemas/TypeB"

    TypeB:
      type: object
      properties:
        value:
          type: integer
        next:
          $ref: "#/components/schemas/TypeC"

    TypeC:
      type: object
      properties:
        description:
          type: string
        next:
          $ref: "#/components/schemas/TypeA"
EOF

[3:48:12 PM] [ADC] › ▶  start     Convert OpenAPI document "/tmp/s18.yaml"
[3:48:12 PM] [ADC] › ✖  error     Convert OpenAPI document "/tmp/s18.yaml"
[3:48:12 PM] [ADC] › ✖  fatal     RangeError: Maximum call stack size exceeded

cat << 'EOF' > /tmp/s19.yaml
openapi: 3.1.0
info:
  title: Test 19 - Minimal 3.1.0
  version: 1.0.0
servers:
  - url: http://localhost

paths:
  /test:
    get:
      responses:
        "200":
          description: Success
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/TypeA"

components:
  schemas:
    TypeA:
      type: object
      properties:
        name:
          type: string
        next:
          $ref: "#/components/schemas/TypeB"

    TypeB:
      type: object
      properties:
        value:
          type: integer
        next:
          $ref: "#/components/schemas/TypeC"

    TypeC:
      type: object
      properties:
        description:
          type: string
        next:
          $ref: "#/components/schemas/TypeA"
EOF

[3:48:13 PM] [ADC] › ▶  start     Convert OpenAPI document "/tmp/s19.yaml"
[3:48:13 PM] [ADC] › ✔  success   Convert OpenAPI document "/tmp/s19.yaml"
[3:48:13 PM] [ADC] › ▶  start     Write converted OpenAPI file
services:
  - name: Test 19 - Minimal 3.1.0
    routes:
      - methods:
          - GET
        name: Test-19-Minimal-3.1.0_test_get
        uris:
          - /test
    upstream:
      nodes:
        - host: localhost
          port: 80
          weight: 100
      pass_host: pass
      scheme: http
      timeout:
        connect: 60
        read: 60
        send: 60
[3:48:13 PM] [ADC] › ✔  success   Converted OpenAPI file to "/dev/stdout" successfully
[3:48:13 PM] [ADC] › ★  star      All is well, see you next time!