/**
 * SKAI Stream Metrics Tracker
 */
import { SkaiStreamMetrics, SkaiStreamValidationResult } from '../types/streaming';
/**
 * Stream metrics tracker class
 */
export declare class SkaiStreamMetricsTracker {
    private metrics;
    constructor(startTime?: number);
    /**
     * Record a chunk being received
     */
    recordChunk(chunkSize: number): void;
    /**
     * Record a content token being processed
     */
    recordToken(tokenContent: string): void;
    /**
     * Record stream completion
     */
    recordCompletion(): void;
    /**
     * Get current metrics snapshot
     */
    getMetrics(): Readonly<SkaiStreamMetrics>;
    /**
     * Get stream duration in milliseconds
     */
    getDuration(): number;
    /**
     * Get stream duration in seconds
     */
    getDurationSeconds(): number;
    /**
     * Get average bytes per chunk
     */
    getAverageBytesPerChunk(): number;
    /**
     * Get time since last activity
     */
    getTimeSinceLastActivity(): number;
    /**
     * Check if stream is considered inactive
     */
    isInactive(timeoutMs: number): boolean;
    /**
     * Validate stream completion and return result
     */
    validateCompletion(expectedContent?: boolean): SkaiStreamValidationResult;
    /**
     * Generate debug log object for stream metrics
     */
    toLogObject(): Record<string, unknown>;
}