/**
 * JsonFileStore, generic JSON file persistence with atomic writes.
 *
 * Handles lazy loading, atomic writes via a temporary file, and ensures the
 * directory hierarchy exists. Invalid JSON and write failures are thrown so
 * callers do not mistake corrupted state for an empty store or persisted write.
 */
export declare class JsonFileStore<T> {
    private readonly filePath;
    constructor(filePath: string);
    /** Load JSON data from disk, or return null if the file does not exist. */
    load(): Promise<T | null>;
    /**
     * Atomically and durably persist data to disk.
     *
     * `rename(2)` alone only makes the swap atomic for concurrent readers; it
     * does not make it survive a power loss. Both fsyncs are what turn the
     * temp+rename into a crash-safe write: the first flushes the temp file's
     * bytes before it is ever named, the second flushes the directory entry so
     * the rename itself is durable. Without them a hard crash can leave the
     * renamed file with unwritten (zero-filled or truncated) contents, which the
     * next `load()` sees as unparseable JSON.
     */
    save(data: T): Promise<void>;
}
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