export interface VersionedEnvelope<T> {
    version: number;
    data: T;
}
export interface SidecarReadOptions<T> {
    currentVersion: number;
    migrations: Record<number, (raw: unknown) => T>;
    label: string;
}
export declare function readVersionedSidecar<T>(filePath: string, options: SidecarReadOptions<T>): T | null;
export declare function writeVersionedSidecar<T>(filePath: string, version: number, data: T): void;
//# sourceMappingURL=sidecar-version.d.ts.map