import { VoiceProviderRegistry } from './provider-registry.js';
import type { VoiceDescriptor, VoiceRealtimeSession, VoiceRealtimeSessionRequest, VoiceSynthesisRequest, VoiceSynthesisResult, VoiceSynthesisStreamResult, VoiceTranscriptionRequest, VoiceTranscriptionResult } from './types.js';
export interface VoiceServiceStatus {
    readonly enabled: boolean;
    readonly providerCount: number;
    readonly providers: Awaited<ReturnType<VoiceProviderRegistry['status']>>;
    readonly note: string;
}
/** One billable voice call (metered providers only; local emits nothing). */
export interface VoiceBillableUsage {
    readonly providerId: string;
    readonly modelId: string | undefined;
    readonly kind: 'tts' | 'stt';
    /** The provider's billable unit count: characters submitted for TTS, seconds of audio for STT. */
    readonly billableUnits: number;
    readonly unit: 'characters' | 'seconds';
}
export declare class VoiceService {
    private readonly registry;
    /** Cost-attribution sink for METERED providers (wired by the runtime root). */
    private readonly onBillableUsage?;
    constructor(registry: VoiceProviderRegistry, 
    /** Cost-attribution sink for METERED providers (wired by the runtime root). */
    onBillableUsage?: ((usage: VoiceBillableUsage) => void) | undefined);
    /** Record a metered call; a provider with billing 'none' emits nothing (honest no-dimension). */
    private recordUsage;
    getStatus(enabled: boolean): Promise<VoiceServiceStatus>;
    listVoices(providerId?: string): Promise<readonly VoiceDescriptor[]>;
    synthesize(providerId: string | undefined, request: VoiceSynthesisRequest): Promise<VoiceSynthesisResult>;
    synthesizeStream(providerId: string | undefined, request: VoiceSynthesisRequest): Promise<VoiceSynthesisStreamResult>;
    transcribe(providerId: string | undefined, request: VoiceTranscriptionRequest): Promise<VoiceTranscriptionResult>;
    openRealtimeSession(providerId: string | undefined, request: VoiceRealtimeSessionRequest): Promise<VoiceRealtimeSession>;
}
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