/**
 * Git reads for `aidlc revert`: is this a branch we may revert on, and which
 * commits has it made since it left `main`.
 *
 * `main` is the base branch the rest of the CLI hard-codes
 * (`concurrency/worktree.ts`, `autopilot/driver.ts`); merged work on `main` is
 * out of scope (revert-by-task/AC-22). Every call is `execFileSync` with an
 * argument array — no shell string ever carries a name from argv.
 *
 * Requirements: revert-by-task/AC-2, AC-3, AC-6, AC-9, AC-18, AC-21, AC-22
 */
import { type TaskRef } from './trailers.js';
/** One commit in `main..HEAD`. */
export interface BranchCommit {
    sha: string;
    short: string;
    subject: string;
    /** Parent count; more than one is a merge (AC-9). */
    parents: number;
    /** Tasks named by well-formed `Task:` trailers. */
    tasks: TaskRef[];
    /** Full shas this commit's message says it reverts (AC-6). */
    reverts: string[];
}
export type RepoMiss = 'not-a-repo' | 'no-main' | 'on-main' | 'dirty';
export type RepoCheck = {
    ok: true;
    branch: string;
} | {
    ok: false;
    reason: RepoMiss;
};
/** Run git in the project root and return stdout; throws on a non-zero exit. */
export declare function git(projectRoot: string, args: string[], input?: string): string;
/**
 * The preconditions every revert needs, in the order the command reports
 * them: a work tree, a `main` branch, not standing on it, and no uncommitted
 * change to a tracked file (untracked files cannot be lost by a revert and do
 * not block it).
 */
export declare function checkRepo(projectRoot: string): RepoCheck;
/** Commits reachable from HEAD and not from `main`, newest first. */
export declare function branchCommits(projectRoot: string): BranchCommit[];
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