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Top-level MarkdownRemark field in a graphql query in a Gatsby site cannot practically be null. But gatsby graphql typegen is generating it as nullable. It is annoying to have to account for nullability of a field that's never actually null.

Non-null operator ! inside of type definition in createSchemaCustomization works on only child fields, not on root fields. So, how can I make such top-level types non-nullable?

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