/**
 * KeyboardSystem.ts
 *
 * Handles virtual keyboard interactions.
 * Listens for UI events and updates TextInput components.
 */
import { HSPlusRuntime } from '@holoscript/core';
/** Extended runtime interface for keyboard-specific methods */
interface KeyboardRuntime extends HSPlusRuntime {
    findInstanceById(id: string): {
        node: {
            id: string;
            type: string;
            properties: Record<string, unknown>;
        };
        children?: Array<{
            node: {
                id: string;
                type: string;
                properties: Record<string, unknown>;
            };
        }>;
    } | null;
    updateNodeProperty(id: string, key: string, value: unknown): void;
}
export declare class KeyboardSystem {
    private runtime;
    private focusedInputId;
    private cursorIndex;
    private static readonly CHAR_WIDTH;
    private static readonly START_X;
    constructor(runtime: KeyboardRuntime);
    private setupListeners;
    handleEvent(event: string, payload: any): void;
    private handleKeyPress;
    private insertAtCursor;
    private getText;
    private updateInputState;
    private setCursorVisible;
    private updateCursorVisuals;
}
export {};
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