export interface KnownBranchesState {
    recorded_at: string;
    branches: string[];
}
export interface BranchSweepResult {
    /** True on the very first run for a project — state file was just created. */
    initial_record: boolean;
    /** Current local branch list, sorted. */
    current_branches: string[];
    /** Branches present in the previous snapshot but absent now, sorted. */
    deleted_branches: string[];
    /** When the previous snapshot was taken (null on initial_record). */
    state_recorded_at: string | null;
    /** Whether branch enumeration succeeded. False = no-op (stat-quo state). */
    enumerated: boolean;
}
export declare function readKnownBranches(twiningDir: string): KnownBranchesState | null;
/**
 * Diff current branches against the recorded snapshot. The state file is
 * updated only when `commit: true` — preview passes ({ execute: false } in
 * housekeeping) compute the diff but leave the snapshot untouched, otherwise
 * a dry-run would silently advance the baseline and consume deletions
 * before the user has a chance to act on them.
 *
 * - First-ever run, commit=true: writes the snapshot, initial_record=true, no deletions.
 * - First-ever run, commit=false: still reports initial_record=true (so callers
 *   know there's no prior baseline) but does NOT write the file.
 * - Subsequent run with no changes: returns empty deletion set.
 * - Subsequent run with deletions: returns the deleted branches.
 * - Branch enumeration failure (non-git, git missing): returns enumerated=false
 *   without touching the state file.
 */
export declare function detectDeletedBranches(twiningDir: string, projectRoot: string, commit?: boolean): BranchSweepResult;
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