import { spawn } from 'child_process';
export declare const SCORE_SCHEMA_VERSION: 1;
export declare const DEFAULT_TIMEOUT_MS = 120000;
export interface BranchScore {
    schemaVersion: typeof SCORE_SCHEMA_VERSION;
    pass: number;
    fail: number;
    loc_delta: number;
    lint_ok: boolean | null;
    duration_ms: number;
    error?: string;
    testCmd?: string;
    branchPath: string;
    baseSha: string;
    scoredAt: string;
}
export interface ScoreBranchOptions {
    branchPath: string;
    baseSha: string;
    testCmd?: string;
    timeoutMs?: number;
    _spawn?: typeof spawn;
    _readPackageJson?: (path: string) => Promise<unknown>;
    _now?: () => number;
    _nowIso?: () => string;
}
export interface RankableBranch {
    index: number;
    score: BranchScore | null;
}
export declare function scoreBranch(opts: ScoreBranchOptions): Promise<BranchScore>;
export declare function writeScore(farmDir: string, index: number, score: BranchScore): Promise<string>;
export declare function rankBranches(branches: RankableBranch[]): number[];