[Federation] Support value types#3063
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🎉 Great work here! A Few comments, but don't be too worried, most are just nits and error message improvements!
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LGTM with a couple nitty comments that need not be circled back on. (Also, some worthy considerations from @JakeDawkins's review too.)
Fixed and added tests for edge cases
Only report field type diff errors if types have the same exact shape
Return more info from the type node diffing function.
Address issues that arose by implementing a more correct testing strategy. Namely, we can't use typeFromAST on a fresh schema since it may not have the types we're trying to reference. Revert back to using print() for now.
* Address issue that arose from the more correct testing strategy: Duplicate types need to also be found in the typedefs, not just the schema. * Add error codes to our error messages
Update unique field name validator to disregard entities - this is handled in the unique type name validator.
* Remove extraneous "kind" validation in the field names validator
Co-Authored-By: Jake Dawkins <dawkinsjh@gmail.com>
Co-Authored-By: Jake Dawkins <dawkinsjh@gmail.com>
…TypeNamesWithoutEnumsOrScalars.ts Co-Authored-By: Jake Dawkins <dawkinsjh@gmail.com>
Co-Authored-By: Jesse Rosenberger <git@jro.cc>
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…-server#3063) Value types are type definitions that live on multiple services (more specifically - types, inputs, interfaces, and unions). We've seen the desire internally and within the community to support the idea of a common type that multiple services can reference. A value type is identical by name, kind, and fields across all services. In order to accomplish this, we've extended two of the existing validators: one for type names, and the other for field names. The changes to the validators permit duplicate type names and fields in the case that we've encountered a value type. The validators also provide some actionable, user-friendly errors in the case that we encounter a kind or field type mismatch. Apollo-Orig-Commit-AS: apollographql/apollo-server@cca20d9
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This PR adds support and improved validation errors around "value types" in federation.
What are value types?
Value types are type definitions that live on multiple services (more specifically - types, inputs, interfaces, and unions). We've seen the desire internally and within the community to support the idea of a common type that multiple services can reference. A value type is identical by name, kind, and fields across all services.
Approach
In order to accomplish this, we've extended two of the existing validators: one for type names, and the other for field names. The changes to the validators permit duplicate type names and fields in the case that we've encountered a value type. The validators also provide some actionable, user-friendly errors in the case that we encounter a kind or field type mismatch.