/**
 * Delete all instances of the given item from the array
 * @param arr Array where item will be removed from
 * @param elem The item to remove
 * @param number Number of times that item should be removed (default: `-1` - remove all instances of item)
 * @returns The array with item removed
 */
export declare function delItem<T>(arr: Array<T>, elem: T, number?: number): Array<T>;