export declare function contains<T>(arr: T[], item: T): boolean;
export declare function addRange<T>(arr: T[], range: T[]): void;
export declare function clear<T>(arr: T[]): void;
export declare function clone<T>(arr: T[]): T[];
export declare function remove<T>(arr: T[], item: T): boolean;
export declare function removeAll<T>(arr: T[], value: T): number;
export declare function removeAll<T>(arr: T[], predicate: (item: T, index: number) => boolean): number;
/**
 * Executes an asynchronous function in parallel for all elements of the array.
 * @param func A function that returns a Promise for each item.
 * @param exceptUndefined Whether to exclude undefined results from the output (default: true).
 */
export declare function parallelAsync<T, Q>(list: T[], func: (item: T) => Q | Promise<Q>, exceptUndefined?: boolean): Promise<Awaited<Q>[]>;