/**
 * Sum all numbers in an array
 * @param array An array of numbers to sum
 */
export declare function sumArray(array: Array<number>): number;
/**
 * Reduce a fraction
 * @param array [numerator, denominator]
 */
export declare function reduceFractionArray(array: [number, number]): number[];
export declare function addItem<T>(array: T[], item: T): T[];
export declare function removeItem<T>(array: T[], item: T): T[];
/**
 * Get the next index based on the current index and step.
 *
 * @param currentIndex the current index
 * @param length the total length or count of items
 * @param step the number of steps
 * @param loop whether to circle back once `currentIndex` is at the start/end
 */
export declare function getNextIndex(currentIndex: number, length: number, step?: number, loop?: boolean): number;
/**
 * Get's the previous index based on the current index.
 * Mostly used for keyboard navigation.
 *
 * @param index - the current index
 * @param count - the length or total count of items in the array
 * @param loop - whether we should circle back to the
 * first/last once `currentIndex` is at the start/end
 */
export declare function getPrevIndex(currentIndex: number, count: number, loop?: boolean): number;
export declare function getNextItemFromSearch<T>(items: T[], searchString: string, itemToString: (item: T) => string, currentItem: T): T | null;