import type { SessionSurface } from './session-surface.js';
/**
 * Run the one-time migration for `surface`, guarded by its marker file.
 * Never throws, every step and the marker write itself are independently
 * best-effort; a failure anywhere is logged and otherwise ignored so a
 * migration problem can never break `createSessionSurface` or startup.
 *
 * The marker is written only when NO step failed. A transient failure (an
 * unreadable directory, a cross-device rename) leaves the marker absent, so
 * the next `createSessionSurface` retries the whole pass; every step is
 * existsSync/rename-guarded and therefore safe to repeat.
 */
export declare function runSessionSurfaceMigration(surface: SessionSurface): void;
//# sourceMappingURL=session-migration.d.ts.map