import { SentenceData } from '../types/message.types';
/**
 * Manages the state of conversation sentences for the SDK core.
 * This is a framework-agnostic replacement for the Zustand store.
 */
export declare class ConversationStateService {
    private static instance;
    private sentenceArray;
    private eventBus;
    private constructor();
    static getInstance(): ConversationStateService;
    addSentences(sentences: string[]): void;
    clearSentences(): void;
    triggerNextReady(): {
        text: string;
        index: number;
        totalCount: number;
    } | null;
    getCurrentSentence(): string | null;
    getCurrentSentenceIndex(): number;
    getReadyCount(): number;
    getTotalCount(): number;
    isAllReady(): boolean;
    isSentenceReady(index: number): boolean;
    setSentenceReady(index: number): void;
    getSentences(): SentenceData[];
}