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A function that receives an element (elem) of the iteration and the first and last element of a chunk, and returns a boolean value or a Promise to a boolean value representing whether elem should be added to the current chunk (if true) or be the start of a new chunk (if false)
Signature:
export declare type AsyncChunkingPredicate<T> = (elem: T, lastElem: T, firstElem: T) => boolean | PromiseLike<boolean>;