/**
 * SSML Compatibility Layer
 *
 * This module provides cross-engine SSML compatibility by:
 * 1. Validating SSML structure
 * 2. Converting SSML to engine-specific formats
 * 3. Providing fallbacks for unsupported features
 * 4. Ensuring proper SSML nesting and structure
 */
export interface SSMLCapabilities {
    supportsSSML: boolean;
    supportLevel: "full" | "limited" | "none";
    supportedTags: string[];
    unsupportedTags: string[];
    requiresNamespace: boolean;
    requiresVersion: boolean;
    maxNestingDepth?: number;
}
export interface SSMLValidationResult {
    isValid: boolean;
    errors: string[];
    warnings: string[];
    processedSSML?: string;
}
/**
 * SSML capabilities for different TTS engines
 */
export declare const ENGINE_SSML_CAPABILITIES: Record<string, SSMLCapabilities>;
/**
 * Voice-specific SSML capabilities for engines with dynamic support
 */
export declare const VOICE_SPECIFIC_CAPABILITIES: {
    polly: {
        standard: {
            supportLevel: "full";
            unsupportedTags: never[];
        };
        "long-form": {
            supportLevel: "full";
            unsupportedTags: never[];
        };
        neural: {
            supportLevel: "limited";
            unsupportedTags: string[];
        };
        generative: {
            supportLevel: "limited";
            unsupportedTags: string[];
        };
    };
    google: {
        standard: {
            supportLevel: "full";
            unsupportedTags: never[];
        };
        wavenet: {
            supportLevel: "full";
            unsupportedTags: never[];
        };
        neural2: {
            supportLevel: "limited";
            unsupportedTags: string[];
        };
        journey: {
            supportLevel: "none";
            unsupportedTags: string[];
        };
        studio: {
            supportLevel: "none";
            unsupportedTags: string[];
        };
    };
};
/**
 * SSML Compatibility Manager
 */
export declare class SSMLCompatibilityManager {
    /**
     * Get SSML capabilities for a specific engine and voice
     */
    static getCapabilities(engine: string, voiceId?: string): SSMLCapabilities;
    /**
     * Get voice-specific SSML capabilities
     */
    private static getVoiceSpecificCapabilities;
    /**
     * Detect voice type from voice ID
     */
    private static detectVoiceType;
    /**
     * Validate SSML for a specific engine
     */
    static validateSSML(ssml: string, engine: string, voiceId?: string): SSMLValidationResult;
    /**
     * Process SSML for engine compatibility
     */
    static processSSMLForEngine(ssml: string, engine: string, voiceId?: string): string;
    /**
     * Strip all SSML tags from text
     */
    private static stripAllSSMLTags;
    /**
     * Remove specific SSML tag
     */
    private static removeSSMLTag;
    /**
     * Add required attributes to SSML
     */
    private static addRequiredAttributes;
}