/**
 * Read and write the update-check state file atomically.
 */
import type { UpdateCheckState } from './throttle.js';
export declare const DEFAULT_STATE: UpdateCheckState;
/**
 * Reads the update state file; returns DEFAULT_STATE on any error.
 */
export declare function readUpdateState(stateDir: string): Promise<UpdateCheckState>;
/**
 * Atomically write the update state file with mode 0o600.
 * Uses write-then-rename on the same directory.
 */
export declare function writeUpdateState(stateDir: string, state: UpdateCheckState): Promise<void>;
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