/** @purpose Entry shape for the shared formatter: status discriminator and relative path. */
export type SyncFormatEntry = {
    /** @purpose Sync status discriminator. */
    status: 'added' | 'updated' | 'deleted' | 'unchanged';
    /** @purpose File path relative to the sync root. */
    relativePath: string;
};
/** @purpose Options for formatSyncOutput: dryRun toggles preview labels. */
export type SyncFormatOptions = {
    /** @purpose When true, outputs preview labels instead of writing. */
    dryRun?: boolean;
};
/**
 * @purpose Format a list of sync entries into stdout lines with markers and a summary.
 * @param entries List of entries with status and relative path.
 * @param [opts] Formatting options — dryRun enables preview labels.
 * @returns Array of formatted lines; the last line is the summary.
 */
export declare function formatSyncOutput(entries: SyncFormatEntry[], opts?: SyncFormatOptions): string[];