import type { QaPlan } from "./qa-replay.js";
export interface BenchRow {
    engine: string;
    iterations: number;
    totalMs: number;
    msPerIter: number;
    peakRssMiB: number;
    oks: boolean[];
}
export interface BenchReport {
    kind: "eye" | "qa";
    rows: BenchRow[];
    /** rustwright-vs-playwright pass/fail agreement (qa only); null if single-engine. */
    agreement: number | null;
    note: string;
}
/** Run a workload on both engines (each in its own process) and compare.
 *  rustwright is skipped (with a note) when not installed. */
export declare function runBench(kind: "eye" | "qa", opts?: {
    iterations?: number;
    plan?: QaPlan;
}): Promise<BenchReport>;
/** fraction of iterations where the two engines produced the same pass/fail. */
export declare function agreementOf(a: boolean[], b: boolean[]): number;
export declare function formatReport(r: BenchReport): string;
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