/**
 * Weavetab — tools/performance.ts
 * browser_performance: page performance metrics — Core Web Vitals, memory, navigation timing, resources, raw CDP counters.
 * Weavetab by fy2ne
 */
import CDP from "chrome-remote-interface";
import type { Config } from "../config/loader.js";
export interface PerformanceOptions {
    metrics?: ("vitals" | "memory" | "navigation" | "resources" | "raw")[];
}
export interface PerformanceResult {
    success: boolean;
    metrics?: Record<string, number>;
    vitals?: Record<string, number>;
    memory?: Record<string, number>;
    navigation?: Record<string, any> | null;
    slowest_resources?: any[];
}
export declare function browserPerformance(session: CDP.Client, _config: Config, options?: PerformanceOptions): Promise<PerformanceResult>;