import { type PrimativeKey, type ReadKeyFunction, type ReadMultipleKeysFunction } from '../key';
import { type Maybe } from '../value/maybe.type';
import { type EqualityComparatorFunction } from '../value/comparator';
/**
 * Creates an {@link EqualityComparatorFunction} that compares two arrays of objects by extracting keys
 * and checking that both arrays contain the same set of keys (order-independent).
 *
 * Returns `true` if both arrays have the same length and produce identical key sets.
 * Handles `null`/`undefined` inputs via {@link safeEqualityComparatorFunction}.
 *
 * @param readKey - Function to extract one or more keys from each object
 * @returns An equality comparator for arrays of keyed objects
 */
export declare function objectKeysEqualityComparatorFunction<T, K extends PrimativeKey = PrimativeKey>(readKey: ReadKeyFunction<T, K> | ReadMultipleKeysFunction<T, K>): EqualityComparatorFunction<Maybe<T[]>>;
/**
 * Creates an {@link EqualityComparatorFunction} that compares two objects by extracting a single key
 * from each and checking strict equality.
 *
 * Handles `null`/`undefined` inputs via {@link safeEqualityComparatorFunction}.
 *
 * @param readKey - Function to extract the key from an object
 * @returns An equality comparator for keyed objects
 */
export declare function objectKeyEqualityComparatorFunction<T, K extends PrimativeKey = PrimativeKey>(readKey: ReadKeyFunction<T, K>): EqualityComparatorFunction<Maybe<T>>;