/**
 * Shallow-flatten an array
 */
export declare function flatten<T>(arr: T[][]): T[];
/**
 * Roll an array forwards or backwards.
 *
 * @param {T[]} arr Source array to roll.
 * @param {number} n Number of elements to roll array. Positive values roll towards the end of the array, and negative values roll towards the start.
 *
 * @return {T[]}
 */
export declare function roll<T>(arr: T[], n: number): T[];
/**
 * Sample an element from the array
 */
export declare function sample<T>(arr: T[], rand?: () => number): T;
/**
 * Shuffle an array
 */
export declare function shuffle<T>(arr: T[], rand?: () => number): T[];
/**
 * Create an array of length length, filled with value.
 */
export declare function times<T>(length: number, value?: T): T[];
/**
 * Create an array excluding given values.
 */
export declare function without<T>(arr: T[], ...values: T[]): T[];