//#region src/promise/reduce.d.ts
/**
 * Iterates over an array and reduces it to a single value using an async reducer function.
 *
 * @template T - The type of the array elements
 * @template U - The type of the accumulator and final result
 * @param array - The array to reduce
 * @param reducer - The function to reduce each element (can be async or return a promise)
 * @param initialValue - The initial value for the accumulator
 * @returns Returns a promise that resolves with the final accumulated value
 *
 * @example
 * const sum = await reduce(
 *   [1, 2, 3, 4],
 *   (acc, value) => Promise.resolve(acc + value),
 *   0
 * ); // => 10
 *
 * @example
 * const users = await reduce(
 *   [1, 2, 3],
 *   async (acc, id) => {
 *     const user = await fetchUser(id);
 *     return [...acc, user];
 *   },
 *   []
 * );
 */
declare function reduce<T, U>(array: T[], reducer: (accumulator: U, value: T, index: number) => Promise<U> | U, initialValue: U): Promise<U>;
//#endregion
export { reduce };
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