import type * as Genesis from '..';
export type ManifestJson = Genesis.MFManifestJson;
export declare function createManifest(): ManifestJson;
export declare class Json<T> {
    filename: string;
    data: T;
    private _data;
    private subs;
    constructor(filename: string, _data: () => T);
    get exists(): any;
    get(): T;
    set(data: T): void;
    watch(cb: () => void): () => void;
    private _updateWatch;
    private _watch;
}