export declare function assertSafePathSegment(value: string, label: string): void;
/** Reject workspace escapes and every existing symlink in the managed path ancestry. */
export declare function assertSafeManagedPath(path: string): string;
export declare function fsyncParentDirectory(target: string): void;
export declare function fsyncDirectory(directory: string): void;
export declare function ensureDurableDirectory(directory: string): void;
/**
 * Serialize project-state mutations (including multi-file layer writes to
 * project.json + local.json via writeProjectLayers). Nested calls re-enter the
 * same lease (localLockDepth); prefer write helpers in state.ts for layer I/O.
 */
export declare function withStateWriterLock<T>(work: () => T): T;
export declare function withStateWriterLockAsync<T>(work: () => Promise<T> | T): Promise<T>;
/** Fence every protected mutation if the renewable token lease is no longer ours. */
export declare function assertStateWriterLeaseHealthy(): void;
/** Trace/read-only helpers can fence when called inside a mutation without requiring a lease otherwise. */
export declare function assertStateWriterLeaseHealthyIfHeld(): void;
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