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collection() function

Gets a CollectionReference instance that refers to a subcollection of reference at the the specified relative path.

Signature:

export declare function collection(reference: CollectionReference<unknown>, path: string, ...pathSegments: string[]): CollectionReference<DocumentData>;

Parameters

Parameter	Type	Description
reference	CollectionReference<unknown>	A reference to a collection.
path	string	A slash-separated path to a collection.
pathSegments	string[]	Additional path segments to apply relative to the first argument.

Returns:

CollectionReference<DocumentData>

The CollectionReference instance.

Exceptions

If the final path has an even number of segments and does not point to a collection.