/**
 * Show an error in the console and on the screen.
 *
 * @param text  The error message
 * @returns Always returns true, for consistency with {@link log}.
 */
export declare function error(text: string): true;
/**
 * Print a logging message to console and on the screen if debugging mode is on.
 *
 * @param text  Text to log
 * @returns Returns true if a debugging message was printed, false otherwise.
 */
export declare function log(text: string): boolean;
/**
 * Set the debugging status off.
 *
 * @returns Returns the new status (always false).
 */
export declare function off(): false;
/**
 * Set the debugging status on.
 *
 * @returns Returns the new status (always true).
 */
export declare function on(): true;
/**
 * @returns Returns the current state of the debugging flag.
 */
export declare function status(): boolean;
/**
 * Set or unset the debugging flag.
 *
 * @param newState  If a boolean is passed as an argument, the debugging flag is set to that value.
 * Otherwise the flag's previous value is flipped (true to false, false to true.)
 *
 * @returns Returns the new status of the debugging flag.
 */
export declare function toggle(newState?: boolean): boolean;