/**
 * Path to the native-host status file.
 * This file is the single source of truth for "is the browser extension
 * connected and working?" It's written by the native host on every message
 * and on shutdown; the MCP read tools consult it to give accurate diagnostics
 * instead of generic "no logs found" boilerplate.
 */
export declare const NATIVE_HOST_STATUS_PATH: string;
export declare class NativeHost {
    private sessionId;
    private logStream;
    private isStartingSession;
    private messageQueue;
    private processingQueue;
    private messageCount;
    private rateLimitWindowStart;
    private readonly MAX_MESSAGES_PER_SECOND;
    private readonly connectedAt;
    private firstHeartbeatAt;
    private lastHeartbeatAt;
    private lastActivityAt;
    private sessionsStarted;
    private readonly msgCount;
    private statusWriteScheduled;
    /**
     * Write the current status file atomically-ish (one JSON write).
     * Throttled to once per second to avoid disk thrash on hot message paths.
     */
    private writeStatus;
    /**
     * Start the native messaging host
     * Reads JSON messages from stdin (sent by Chrome extension)
     */
    start(): Promise<void>;
    /**
     * Validate and sanitize URL
     * @param url The URL to validate
     * @returns Validated URL or undefined if invalid
     */
    private validateUrl;
    /**
     * Validate and sanitize project directory path
     * For browser monitoring, try to detect the actual project directory from running terminal sessions
     * This ensures browser logs are grouped with the project they belong to
     */
    private validateProjectDir;
    /**
     * Check and enforce rate limiting
     * @returns true if message should be processed, false if rate limit exceeded
     */
    private checkRateLimit;
    /**
     * Process queued messages
     */
    private processMessageQueue;
    /**
     * Handle a message from the Chrome extension
     */
    private handleMessage;
    /**
     * Internal handler for processing a message
     */
    private handleMessageInternal;
    /**
     * Start a new browser monitoring session
     */
    private startSession;
    /**
     * End the current browser monitoring session
     */
    private endSession;
    /**
     * Log a console message
     */
    private logConsole;
    /**
     * Log a network request/response
     */
    private logNetwork;
    /**
     * Log a JavaScript error
     */
    private logError;
    /**
     * Log a performance metric
     */
    private logPerformance;
}
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