Fix crash when GraphQLError is “too many validation errors” #438
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When a GraphQLError from the JS parsing step is a “Too many validation errors” error, there is no
source
in the error object. This was causing a crash. We should make this an optional parameter and check for it to avoid this edge case.Writing a unit test for this is difficult because we would need to write a large schema document with many errors in it. This is a minor edge case, and I think that an inline comment explaining the problem should suffice to prevent regressions here.