/**
 * Gets the first element of array.
 *
 * @param array - The array to query
 * @returns The first element of array
 *
 * @example
 * ```ts
 * head([1, 2, 3]);
 * // => 1
 *
 * head([]);
 * // => undefined
 * ```
 */
export declare function head<T>(array: T[]): T | undefined;
/**
 * Gets the last element of array.
 *
 * @param array - The array to query
 * @returns The last element of array
 *
 * @example
 * ```ts
 * last([1, 2, 3]);
 * // => 3
 * ```
 */
export declare function last<T>(array: T[]): T | undefined;
/**
 * Gets all but the first element of array.
 *
 * @param array - The array to query
 * @returns The slice of array
 *
 * @example
 * ```ts
 * tail([1, 2, 3]);
 * // => [2, 3]
 * ```
 */
export declare function tail<T>(array: T[]): T[];
/**
 * Gets all but the last element of array.
 *
 * @param array - The array to query
 * @returns The slice of array
 *
 * @example
 * ```ts
 * initial([1, 2, 3]);
 * // => [1, 2]
 * ```
 */
export declare function initial<T>(array: T[]): T[];
export declare const first: typeof head;