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type ExtractValuesRecusrively<T> = T extends FormState<infer U>
? { [K in keyof U]: ExtractValuesRecusrively<U[K]> }
: T extends FieldState<infer V>
? V
: never;
// vs
type ExtractValuesRecusrively<State> = State extends FormState<infer InnerForm>
? { [FieldKey in keyof InnerForm]: ExtractValuesRecusrively<InnerForm[FieldKey]> }
: State extends FieldState<infer FieldType>
? FieldType
: never;
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