import * as chromeLauncher from "chrome-launcher";
import { LighthouseResult, LighthouseAuditResult } from "./types.js";
export declare function launchChrome(): Promise<chromeLauncher.LaunchedChrome>;
export declare function getScreenEmulation(device: "desktop" | "mobile"): {
    mobile: boolean;
    width: 1350 | 360;
    height: 940 | 640;
    deviceScaleFactor: number;
    disabled: boolean;
};
declare const LOG_LEVELS: readonly ["silent", "error", "info", "verbose"];
type LogLevel = (typeof LOG_LEVELS)[number];
/**
 * Lighthouse logs to stderr, which for a stdio MCP server is the user's log output. At
 * "info" a single audit emits hundreds of lines, so default to errors only and let
 * LIGHTHOUSE_LOG_LEVEL turn the detail back on when debugging a failing launch.
 */
export declare function getLogLevel(): LogLevel;
export declare function buildLighthouseOptions(port: number, device: "desktop" | "mobile", categories?: string[], throttling?: boolean, disableStorageReset?: boolean): {
    disableStorageReset?: boolean | undefined;
    logLevel: "silent" | "error" | "info" | "verbose";
    output: "json";
    onlyCategories: string[] | undefined;
    port: number;
    formFactor: "desktop" | "mobile";
    screenEmulation: {
        mobile: boolean;
        width: 1350 | 360;
        height: 940 | 640;
        deviceScaleFactor: number;
        disabled: boolean;
    };
    throttling: {
        readonly rttMs: 150;
        readonly throughputKbps: 1638.4;
        readonly cpuSlowdownMultiplier: 4;
    } | {
        readonly rttMs: 0;
        readonly throughputKbps: number;
        readonly cpuSlowdownMultiplier: 1;
    };
};
export declare function runRawLighthouseAudit(url: string, categories?: string[], device?: "desktop" | "mobile", throttling?: boolean): Promise<LighthouseResult>;
export declare function filterAuditsByCategory(lhr: LighthouseResult["lhr"], categoryKey: string): {
    id: string;
    title: string;
    description: string | undefined;
    score: number | null;
    scoreDisplayMode: string | undefined;
    displayValue: string | undefined;
}[];
export declare function formatCategoryScores(lhr: LighthouseResult["lhr"]): Record<string, {
    title: string;
    score: number;
    description: string;
}>;
export declare function extractKeyMetrics(lhr: LighthouseResult["lhr"]): Record<string, {
    title: string;
    value: number;
    displayValue: string;
    score: number | null;
}>;
export declare function runLighthouseAudit(url: string, categories?: string[], device?: "desktop" | "mobile", throttling?: boolean): Promise<LighthouseAuditResult>;
export declare function getDetailedAuditResults(url: string, category: string, device: "desktop" | "mobile"): Promise<{
    lhr: {
        finalDisplayedUrl: string;
        fetchTime: string;
        lighthouseVersion: string;
        userAgent: string;
        categories: Record<string, import("./types.js").LighthouseCategory>;
        audits: Record<string, import("./types.js").LighthouseAudit>;
        runtimeError?: {
            code: string;
            message: string;
        };
    };
    audits: {
        id: string;
        title: string;
        description: string | undefined;
        score: number | null;
        scoreDisplayMode: string | undefined;
        displayValue: string | undefined;
    }[];
}>;
export {};