import type { SGRTerminal } from './terminal.js';
import type { SystemEvent } from './events/index.js';
export type Alignment = 'left' | 'right' | 'center';
export declare const FontFamilies: readonly ["default", "serif-bold", "serif-italic", "serif-italic-bold", "sans", "sans-bold", "sans-italic", "sans-italic-bold", "monospace", "double-struck", "fraktur", "fraktur-bold", "script", "script-bold"];
export type FontFamily = (typeof FontFamilies)[number];
export type Font = Map<string, string>;
export type Orientation = 'horizontal' | 'vertical';
export type Direction = 'right' | 'left' | 'down' | 'up';
export interface Edges {
    top: number;
    right: number;
    bottom: number;
    left: number;
}
export interface LegendItem {
    key: string | string[];
    label: string;
}
/**
 * The abstract interface that Screen depends on. Any terminal backend
 * (real terminal, test harness, web adapter, etc.) can implement this.
 */
export interface Program extends SGRTerminal {
    /**
     * Prepare the terminal for fullscreen app mode (e.g. enter alt buffer,
     * enable mouse, hide cursor). Called once before the first render.
     */
    setup(): void;
    /**
     * Restore the terminal to its original state (e.g. exit alt buffer,
     * show cursor). Called when the screen stops.
     */
    teardown(): void;
    /**
     * Subscribe to system events (key, mouse, paste, focus/blur).
     * Returns an unsubscribe function.
     */
    onEvents(listener: (event: SystemEvent) => void): () => void;
    /**
     * Subscribe to terminal resize events.
     * Returns an unsubscribe function.
     */
    onResize(listener: () => void): () => void;
}