langchain.js
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    Type Alias QAChainParams

    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".