/**
 * ghls sync — synchronize stack branches with the latest base branch.
 *
 * Two strategies:
 *   - 'merge' (default): Merge base into each PR branch. NO force-push.
 *     Approvals survive because GitHub only dismisses on diff-changing pushes.
 *   - 'rebase': Rebase stack onto base. Requires force-push, may dismiss approvals.
 */
import type { Command } from 'commander';
export declare function registerSync(program: Command): void;
export declare function runSync(opts: {
    continue?: boolean;
    abort?: boolean;
    push?: boolean;
    force?: boolean;
    rebase?: boolean;
    conflict?: string;
    yes?: boolean;
}): Promise<void>;
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