/**
 * Converts a 3D array index to a 1D index
 *
 * @param x row in slice index
 * @param y depth/slice index
 * @param z column index
 * @param width length of each row in array
 * @param depth number of rows in array
 * @returns index of (x, y, z) in flat array
 */
export declare function from3Dto1D(x: number, y: number, z: number, width: number, depth: number): number;
/**
 * Converts a 2D array index to a 1D index
 *
 * @param x column index
 * @param y row index
 * @param width length of each row in array
 * @returns index of (x, y) in flat array
 */
export declare function from2Dto1D(x: number, y: number, width: number): number;