/**
 * Iterates the array in reverse order and returns the index of the first
 * element that satisfies the provided testing function. If no elements satisfy
 * the testing function, -1 is returned.
 *
 * See also `findLast` which returns the value of last element that satisfies
 * the testing function (rather than its index).
 *
 * @param data - The items to search in.
 * @param predicate - A function to execute for each element in the array. It
 * should return `true` to indicate a matching element has been found, and
 * `false` otherwise.
 * @returns The index of the last (highest-index) element in the array that
 * passes the test. Otherwise -1 if no matching element is found.
 * @signature
 *    R.findLastIndex(data, predicate)
 * @example
 *    R.findLastIndex([1, 3, 4, 6], n => n % 2 === 1) // => 1
 * @dataFirst
 * @category Array
 */
declare function findLastIndex<T>(data: ReadonlyArray<T>, predicate: (value: T, index: number, data: ReadonlyArray<T>) => boolean): number;
/**
 * Iterates the array in reverse order and returns the index of the first
 * element that satisfies the provided testing function. If no elements satisfy
 * the testing function, -1 is returned.
 *
 * See also `findLast` which returns the value of last element that satisfies
 * the testing function (rather than its index).
 *
 * @param predicate - A function to execute for each element in the array. It
 * should return `true` to indicate a matching element has been found, and
 * `false` otherwise.
 * @returns The index of the last (highest-index) element in the array that
 * passes the test. Otherwise -1 if no matching element is found.
 * @signature
 *    R.findLastIndex(fn)(items)
 * @example
 *    R.pipe(
 *      [1, 3, 4, 6],
 *      R.findLastIndex(n => n % 2 === 1)
 *    ) // => 1
 * @dataLast
 * @category Array
 */
declare function findLastIndex<T>(predicate: (value: T, index: number, data: ReadonlyArray<T>) => boolean): (array: ReadonlyArray<T>) => number;

export { findLastIndex };