export default addArrays;
/**
 * Add two 1D arrays
 *
 * @description
 * `a2` is added onto `a1`, hence `a2` needs to be at least as long as `a1`.
 *
 * @example
 * ```
 * addArrays([1,2,3], [2,3,4,5]) === [3,5,7]
 * ```
 *
 * @param {Array<number>} a1 - First array of numbers
 * @param {Array<number>} a2 - Second array of numbers
 * @param {(index: number) => number} accessor - Allows to use custom accessors. This can be useful when a2 represents a transformed (e.g., transposed matrix).
 * @return {Array<number>} - Combination of both arrays.
 */
declare function addArrays(a1: Array<number>, a2: Array<number>, accessor?: (index: number) => number): Array<number>;