/**
 * Turning raw browser instrument output into a verdict.
 *
 * Pure functions only — no CDP, no session, no I/O — so the judgement calls
 * (what counts as a poor LCP, which function is actually hot) can be read and
 * tested on their own. Used by the tools in `browser-profile-tools.ts`.
 */
export declare function gradeVitals(vitals: Record<string, number | undefined>): {
    assessment: Record<string, string>;
    worst: string[];
};
interface CpuProfileNode {
    id: number;
    callFrame: {
        functionName?: string;
        url?: string;
        lineNumber?: number;
    };
    hitCount?: number;
}
export interface TopFunction {
    functionName: string;
    url?: string;
    line?: number;
    selfMs: number;
    selfPercent: number;
}
/**
 * Self time per function from a V8 .cpuprofile. Sampling profiles record a hit
 * count per node; self time is that share of the wall-clock window.
 */
export declare function summarizeCpuProfile(profile: {
    nodes?: CpuProfileNode[];
    startTime?: number;
    endTime?: number;
}, top: number): {
    durationMs: number;
    totalSamples: number;
    topFunctions: TopFunction[];
};
export {};
//# sourceMappingURL=browser-metrics.d.ts.map