/** * Computes the symmetric difference between two arrays using a custom mapping function. * The symmetric difference is the set of elements which are in either of the arrays, * but not in their intersection, determined by the result of the mapping function. * * @template T - Type of elements in the input arrays. * @template U - Type of the values returned by the mapping function. * * @param {T[]} arr1 - The first array. * @param {T[]} arr2 - The second array. * @param {(item: T) => U} mapper - The function to map array elements to comparison values. * @returns {T[]} An array containing the elements that are present in either `arr1` or `arr2` but not in both, based on the values returned by the mapping function. * * @example * // Custom mapping function for objects with an 'id' property * const idMapper = obj => obj.id; * xorBy([{ id: 1 }, { id: 2 }], [{ id: 2 }, { id: 3 }], idMapper); * // Returns [{ id: 1 }, { id: 3 }] */ declare function xorBy(arr1: readonly T[], arr2: readonly T[], mapper: (item: T) => U): T[]; export { xorBy };