/**
 * Event-driven UI Engine
 *
 * A flexible engine for building custom interactive terminal UIs
 * with support for key events, timers, and async updates.
 */
import { Readable, Writable } from 'stream';
import { TerminalKeypress } from '../keypress';
import { UIEvent, UIScreenConfig } from './types';
/**
 * ANSI escape codes for terminal control
 */
declare const ANSI: {
    clearScreen: string;
    hideCursor: string;
    showCursor: string;
    cursorUp: (n: number) => string;
    cursorDown: (n: number) => string;
    cursorTo: (x: number, y: number) => string;
    clearLine: string;
    clearToEnd: string;
    saveCursor: string;
    restoreCursor: string;
};
export interface UIEngineOptions {
    input?: Readable;
    output?: Writable;
    noTty?: boolean;
    /** Existing keypress instance to reuse (avoids multiple listeners on stdin) */
    keypress?: TerminalKeypress;
    /** If true, engine owns the keypress and will destroy it on cleanup. Default: true if keypress not provided */
    ownsKeypress?: boolean;
    /** If true, clear the entire screen on start instead of just overwriting lines */
    clearScreenOnStart?: boolean;
}
export declare class UIEngine {
    private input;
    private output;
    private noTty;
    private keypress;
    private ownsKeypress;
    private clearScreenOnStart;
    private tickTimer;
    private lastLineCount;
    constructor(options?: UIEngineOptions);
    /**
     * Write to output
     */
    private write;
    /**
     * Clear the screen
     */
    private clearScreen;
    /**
     * Hide the cursor
     */
    private hideCursor;
    /**
     * Show the cursor
     */
    private showCursor;
    /**
     * Render lines to the terminal, clearing previous output
     */
    private render;
    /**
     * Run a custom UI screen
     */
    run<S, V = unknown, D = unknown>(config: UIScreenConfig<S, V, D>): Promise<V | undefined>;
    /**
     * Dispatch an external event (for async updates)
     */
    dispatch<S, V, D>(event: UIEvent<D>): void;
    /**
     * Cleanup resources
     */
    destroy(): void;
}
export { ANSI };