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My previous proposal only addressed pure OneOf cycles, and failed to handle other invalid cycles, like mixed OneOf/non-Oneof cycles: ``` input A @OneOf { b:B } input B { a:A! } ``` This trues up the implementation with the proposed spec changes, which consolidates input cycle detection under one algorithm: InputObjectCanBeProvidedAFiniteValue
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Great tests! (It's 10:30pm so I've not tried to review the code... 😅)
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This PR implements the validation described at graphql/graphql-spec#1211
More discussion is at the link above, but the core issue is around uninhabited OneOf types -- the property that a type can be defined in a way that a value cannot be generated for it.
The simplest example of an uninhabited type is this recursive OneOf:
While this type definition is currently valid by the rules of OneOf types and circular input types, it violates the spirit of the Circular References because it does not allow construction of a finite value.
This PR updates the existing cycle validation to consider OneOf types. I've tried to follow the existing conventions, though I'm also new here and might have missed something. Any feedback on style or substance is welcome.