/**
 * Equals true when `process.stdout` is a TTY.
 *
 * When false, the `clear` and `spin` functions do nothing,
 * and `MistyTask` methods are restricted to append-only logs.
 */
declare const isInteractive: boolean;

/** Write to the current line */
declare const print: {
    (buffer: string | Uint8Array, cb?: ((err?: Error | undefined) => void) | undefined): boolean;
    (str: string | Uint8Array, encoding?: BufferEncoding | undefined, cb?: ((err?: Error | undefined) => void) | undefined): boolean;
};
/**
 * Log a yellow message prefixed by `[!]`
 */
declare function warn(msg: string): void;
/** Print a warning at most once */
declare function warnOnce(msg: string): void;
/**
 * Log an error message and call `process.exit(1)`
 */
declare function fatal(...args: any[]): never;
/**
 * Log a message prefixed by a green ✔︎
 */
declare function success(...args: any[]): void;
/** Clear the screen and its history */
declare function clear(): void;
/** Clear a number of lines above the cursor */
declare function clear(lines: number): void;
/** Format an elapsed time (in milliseconds) to a human-readable string */
declare function formatElapsed(start: number): string;

export { clear, fatal, formatElapsed, isInteractive, print, success, warn, warnOnce };