/**
 * @holoscript/core Voice Synthesizer Interface
 *
 * Defines the @builtin runtime interface for neural text-to-speech.
 * Runtimes implement this to bridge with providers like ElevenLabs, Azure, or Coqui.
 */
/**
 * Voice synthesizer configuration
 */
export interface VoiceConfig {
    /** Backend provider (e.g., 'elevenlabs', 'azure', 'coqui') */
    backend: string;
    /** API Key or local model path */
    apiKey?: string;
    modelPath?: string;
    /** Default voice settings */
    defaultVoiceId?: string;
}
/**
 * Speech synthesis request
 */
export interface VoiceRequest {
    text: string;
    voiceId?: string;
    /** Emotion parameters (0-1 intensity) */
    emotion?: {
        type: 'angry' | 'sad' | 'excited' | 'friendly' | 'scared' | 'neutral';
        intensity: number;
    };
    /** Prosody settings */
    pitch?: number;
    rate?: number;
    volume?: number;
}
/**
 * Available voice information
 */
export interface VoiceInfo {
    id: string;
    name: string;
    gender?: 'male' | 'female' | 'non-binary';
    language: string;
    provider: string;
}
/**
 * VoiceSynthesizer @builtin Interface
 */
export interface VoiceSynthesizer {
    /** Initialize the synthesizer with config */
    initialize(config: VoiceConfig): Promise<void>;
    /**
     * Generate audio buffer from text.
     * Runtimes should handle the actual networking/synthesis.
     */
    generate(request: VoiceRequest): Promise<ArrayBuffer>;
    /** List available voices */
    getVoices(): Promise<VoiceInfo[]>;
    /** Dispose resources */
    dispose(): void;
}
/**
 * Global registry for builtin VoiceSynthesizers
 */
export declare const voiceSynthesizerRegistry: Map<string, VoiceSynthesizer>;
/**
 * Register a voice synthesizer implementation
 */
export declare function registerVoiceSynthesizer(name: string, synthesizer: VoiceSynthesizer): void;
/**
 * Get a registered voice synthesizer
 */
export declare function getVoiceSynthesizer(name: string): VoiceSynthesizer | undefined;
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