/**
 * Given the array `a`, moves element with index `i` one position up.
 * Mutates the given array. Does nothing if `i` is an invalid index.
 */
export declare const moveArrayElementUp: (a: Array<any>, i: number) => void;
/**
 * Given the array `a`, moves element with index `i` one position down.
 * Mutates the given array. Does nothing if `i` is an invalid index.
 */
export declare const moveArrayElementDown: (a: Array<any>, i: number) => void;
/**
 * Given the array `a`, swaps the positions of elements with indexes `i` and `j`,
 * mutating the given array. Does nothing if `i` or `j` are invalid indexes.
 */
export declare const swapArrayElements: (a: Array<any>, i: number, j: number) => void;
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