QAChainParams: {
    type?: "stuff";
} & StuffQAChainParams | {
    type?: "map_reduce";
} & MapReduceQAChainParams | {
    type?: "refine";
} & RefineQAChainParams

Represents the parameters for creating a QAChain. It can be of three types: "stuff", "map_reduce", or "refine".

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