/**
 * Groups elements of an array into a Map based on a given iteratee function.
 * Unlike groupBy which returns Record<K, T[]>, this preserves insertion order
 * and allows any key type (including objects and symbols).
 * @param array Array to group
 * @param iteratee Function to determine the group key for each element
 * @returns Map with grouped elements keyed by the iteratee result
 * @example
 * groupByToMap([6.1, 4.2, 6.3], Math.floor); // Map { 6 => [6.1, 6.3], 4 => [4.2] }
 * groupByToMap(["one", "two", "three"], (str) => str.length); // Map { 3 => ['one', 'two'], 5 => ['three'] }
 */
export declare const groupByToMap: <T, K>(array: T[], iteratee: (value: T, index: number, array: T[]) => K) => Map<K, T[]>;