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Introspection used fetchPolicy 'network-only', which still writes the result to the Apollo cache and reads it back. For servers that return the type name as __typename of an introspection type (e.g. pg_graphql), the cache normalizes those entries and the fields are lost. Use 'no-cache' instead.
ThieryMichel
approved these changes
Nov 10, 2026
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Fixes #10215
introspectSchemafetches the schema withfetchPolicy: 'network-only'. That skips the cache read but still writes the result to the Apollo cache and returns what is read back from it. Some servers (pg_graphql, for example) set__typenameon introspection types to the type's own name, likeBigFloat. The cache then normalizes those entries, and the returned types come back as just{ __typename: 'BigFloat' }.Switching to
no-cachereturns the raw response, which is what introspection wants anyway. I left the data queries inindex.tsalone.I added a test with a real
ApolloClientandInMemoryCacheand a type with a custom__typename. It fails withnetwork-onlyand passes withno-cache.