import type { ONICheckpointer } from "../../types.js";
export interface ExperimentOptions<S> {
    checkpointer: ONICheckpointer<S>;
    threadId: string;
    hypothesis: string;
    applyChanges: () => Promise<void>;
    measureMetric: () => Promise<number>;
    timeBudget: number;
    threshold: number;
    /** Whether the metric should be minimized or maximized. Defaults to "minimize". */
    direction?: "minimize" | "maximize";
}
export interface ExperimentResult {
    hypothesis: string;
    success: boolean;
    metricBefore: number;
    metricAfter: number | null;
    rolledBack: boolean;
    reason: string;
}
export declare class ExperimentalExecutor {
    /**
     * Run an experiment with automatic rollback if the metric regresses.
     *
     * 1. Snapshot current checkpoint
     * 2. Apply proposed changes
     * 3. Measure metric
     * 4. If improved by >= threshold: keep changes
     * 5. If regressed: restore checkpoint
     */
    runExperiment<S>(opts: ExperimentOptions<S>): Promise<ExperimentResult>;
    private _rollback;
    private _timeout;
}
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