Function createRetrievalChain

createRetrievalChain(params): RunnableInterface<{
    input: string;
    chat_history?: BaseMessage[] | string;
}, {
    answer: string;
    context: string;
} & {
    [key: string]: unknown;
}>
Create a retrieval chain that retrieves documents and then passes them on.
Parameters
- params: CreateRetrievalChainParams
  
  A params object containing a retriever and a combineDocsChain.
Returns RunnableInterface<{
    input: string;
    chat_history?: BaseMessage[] | string;
}, {
    answer: string;
    context: string;
} & {
    [key: string]: unknown;
}>
An LCEL Runnable which returns a an object containing at least context and answer keys.
Example
```
// TODO
```
- Defined in langchain/src/chains/retrieval.ts:58

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