import { Unpack } from "./common";
/**
 * Returns a single item by iterating through the list,
 * successively calling the iterator function and passing it an accumulator value and the current value from the array,
 * and then passing the result to the next call.
 * Works for both Arrays and Objects
 *
 * The iterator function receives two values: `(acc, value, key)`. In the case of an array `key` is the index, in the case of object is the property name
 * @param reducer Iterator function
 * @param Init Initial Value
 * @param Init Array or object to reduce
 */
export declare function reduce<VTYPE, RTYPE = any>(reducer: (acc: RTYPE, curr: Unpack<VTYPE>, key?: any) => RTYPE): ((init: RTYPE, collection?: VTYPE) => RTYPE) | ((collection: VTYPE) => RTYPE);
export declare function reduce<VTYPE, RTYPE = any>(reducer: (acc: RTYPE, curr: Unpack<VTYPE>, key?: any) => RTYPE, init?: RTYPE): ((collection: VTYPE) => RTYPE);
export declare function reduce<VTYPE, RTYPE = any>(reducer: (acc: RTYPE, curr: Unpack<VTYPE>, key?: any) => RTYPE, init?: RTYPE, collection?: VTYPE): RTYPE;
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