/**
 * Try to read and parse a JSON file. Returns null when the file does not
 * exist or cannot be parsed. Never throws.
 */
export declare function tryReadJson(filePath: string): unknown | null;
/**
 * List all state files in `stateDir` that start with `prefix` and end with
 * `.json`. Returns an empty array when the directory does not exist.
 */
export declare function listStateFiles(stateDir: string, prefix: string): string[];
/**
 * List all NDJSON state files in `stateDir` that start with `prefix` and end
 * with `.ndjson`. Returns an empty array when the directory does not exist.
 */
export declare function listNDJSONFiles(stateDir: string, prefix: string): string[];
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