declare type Graph<T> = {
    [id: string]: {
        children: string[];
        data?: T;
    };
};
export declare class DirectedGraph<T> {
    graph: Graph<T>;
    placeholderNodes: {
        [id: string]: true;
    };
    addEdge(parentId: string, id: string): void;
    addNodeIfNotExist(id: string, data: T): void;
}
export {};