import type { Rng } from "./rng.js";
/** A pool member: a payload plus the score vector/objective the frontier reasons over.
 *  In GEPA, `value` is the full Candidate (ws + scorecard + files), so reflection can
 *  reach the parent's per-input grades and traces. */
export type PoolCandidate<T> = {
    value: T;
    inputScores: number[];
    objective: number;
};
export declare class CandidatePool<T> {
    private readonly candidates;
    constructor(candidates: PoolCandidate<T>[]);
    add(candidate: PoolCandidate<T>): void;
    size(): number;
    best(): PoolCandidate<T>;
    sampleParent(rng: Rng): PoolCandidate<T>;
}