import { ExtensionMessage } from './messaging/ExtensionMessageTypes';
import { ExtensionVowelController } from './ExtensionVowelController';
/**
 * Synchronizes Vowel state to content scripts
 *
 * @example
 * ```typescript
 * const stateSync = new ExtensionStateSync(controller);
 * await stateSync.broadcastStateUpdate(state);
 * ```
 */
export declare class ExtensionStateSync {
    private controller;
    constructor(controller: ExtensionVowelController);
    /**
     * Broadcast state update to all content scripts
     *
     * @param state - Current Vowel state
     */
    broadcastStateUpdate(state: any): Promise<void>;
    /**
     * Broadcast transcript update
     *
     * @param transcript - Transcript data
     */
    broadcastTranscriptUpdate(transcript: {
        type: 'user' | 'agent';
        text: string;
        isFinal: boolean;
    }): Promise<void>;
    /**
     * Broadcast error
     *
     * @param error - Error object or message
     */
    broadcastError(error: Error | string): Promise<void>;
    /**
     * Broadcast audio playback event
     *
     * @param event - Playback event type
     */
    broadcastAudioPlayback(event: 'started' | 'stopped'): Promise<void>;
    /**
     * Send message to specific tab
     *
     * @param tabId - Target tab ID
     * @param message - Message to send
     */
    sendToTab(tabId: number, message: ExtensionMessage): Promise<void>;
    /**
     * Send message to all tabs with content script
     */
    private sendToAllContentScripts;
    /**
     * Get active tab and send message to it
     *
     * @param message - Message to send
     */
    sendToActiveTab(message: ExtensionMessage): Promise<void>;
    /**
     * Get the currently active tab
     */
    private getActiveTab;
}
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