How do you create a swagger schema that includes an array of varying types

OpenAPI 3.0 supports oneOf and anyOf:

      schema:
        type: array
        items:
          oneOf:
            - $ref: '#/components/schemas/directiveRequire'
            - $ref: '#/components/schemas/directiveReplace'
            - ...

In OpenAPI 2.0, you can define an object with varying properties as just type: object (free-form object). For your case, you may want to do this:

      schema:
        type: array
        items:
          type: object