/**
 * Text-to-Speech (TTS) Tool Registration
 *
 * Registers the TTS tool for reading content aloud.
 *
 * Maps to QTI 3.0 standard access features:
 * - textToSpeech (auditory support)
 * - readAloud (auditory support)
 */
import type { ToolRegistration } from "../../services/ToolRegistry.js";
export declare const TOOL_ELEMENT_UNMOUNT_CALLBACK_PROP = "__pieToolElementUnmount";
export declare const TOOL_ACTIVE_CHANGE_EVENT = "pie-tool-active-change";
/**
 * Text-to-Speech tool registration
 *
 * Supports:
 * - Reading content aloud using browser TTS or external providers
 * - Context-aware visibility (shows when readable text is available)
 * - All levels except assessment and element
 */
export declare const ttsToolRegistration: ToolRegistration;
