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Closes #634.
Internally, graphql-let just imports create transformer from jest. So updating its own copy of Jest should solve this issue. As mentioned in the upstream PR (jestjs/jest#12638), it seems like this is a more restrictive return type than was previously allowed, but it was a subset of the previous return type, so my assumption is that this should be backwards compatible.
Regardless, it's needed, but would be prudent to test against an older project to verify if this is a major or minor release (and see if there's a way to note this with jest optional deps or something)