Function collapseDocs

collapseDocs(docs, combineDocumentFunc): Promise<Document>
Collapses a list of documents into a single document.

This function takes a list of documents and a function to combine the content of these documents. It combines the content of the documents using the provided function and merges the metadata of all documents. If a metadata key is present in multiple documents, the values are concatenated with a comma separator.
Parameters
- docs: Document<Record<string, any>>[]
  
  The list of documents to be collapsed.
- combineDocumentFunc: ((docs) => Promise<string>)
  
  A function that combines the content of a list of documents into a single string. This function should return a promise that resolves to the combined string.
  - - (docs): Promise<string>
    - Parameters
      
      docs: Document<Record<string, any>>[]
      
      Returns Promise<string>
Returns Promise<Document>
- A promise that resolves to a single document with combined content and merged metadata.
Throws
- Throws an error if the combineDocumentFunc does not return a promise or if the promise does not resolve to a string.
- Defined in docs/api_refs/langchain/src/chains/combine_documents/reduce.ts:53

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