/**
 * Description: compare two array: returns true if they are equal, else false.
 * @param a unknown (array)
 * @param b unknown (array)
 */
export declare function compareArray(a: unknown, b: unknown): boolean;
/**
 * check if index is accessible in an array
 * @param idx Index
 * @param arr given array
 * @param line line number in TEAL file
 * Note: if user is accessing this function directly through runtime,
 * the line number is unknown
 */
export declare function checkIndexBound(idx: number, arr: any[], line?: number): void;