/** @noSelfInFile */
/**
 * (Lua-safe) Gets or sets the length of the array. This is a number one higher
 * than the highest index in the array.
 */
export declare const getLength: <T>(arr: T[]) => number;
/**
 * Removes nils from the array.
 */
export declare const compact: <T>(arr: (T | null | undefined)[]) => T[];
/**
 * (Lua-safe) Performs the specified action for each element in an array.
 */
export declare const forEach: <T>(arr: T[], fn: (element: T, index: number) => void) => void;
declare type Filter = {
    <A>(arr: A[], fn: (element: A, index: number) => boolean): A[];
    <A, B extends A>(arr: A[], fn: (element: A | B, index: number) => element is B): B[];
};
/**
 * (Lua-safe) Returns the elements of an array that meet the condition specified
 * in a callback function.
 */
export declare const filter: Filter;
/**
 * (Lua-safe) Calls a defined callback function on each element of an array, and
 * returns an array that contains the results.
 */
export declare const map: <A, B>(arr: A[], fn: (element: A, index: number) => B) => B[];
/**
 * (Lua-safe) Adds all the elements of an array into a string, separated by the
 * specified separator string.
 */
export declare const join: <A>(arr: A[], separator?: string) => string;
export {};