oneOf in OAS3 not supported

[mediafreakch]

Consider the following OAS3:

openapi: 3.0.0
components:
  schemas:
    ArticleFraud:
      type: object
      properties:
        reason:
          type: string
    UserFraud:
      type: object
      properties:
        reason:
          type: string
    FraudCase:
      type: object
      properties:
        id:
          type: number
        metadata:
          oneOf:
            - $ref: '#/components/schemas/ArticleFraud'
            - $ref: '#/components/schemas/UserFraud'

Fails with: TypeError: Cannot read property 'match' of undefined in https://github.com/yayoc/swagger-to-flowtype/blob/master/src/index.js#L25