export declare class GraphHasCyclesError extends Error {
}
export declare type Primitive = string | number;
export interface NodeSlotDescriptor<IdT extends Primitive, DataT> {
    getNodeOutSlots(node: DataT): Iterable<IdT>;
    getNodeInSlots(node: DataT): Iterable<IdT>;
}
export declare function nodeSlotDescriptor<IdT extends Primitive, DataT>(getNodeInSlots: (node: DataT) => Iterable<IdT>, getNodeOutSlots: (node: DataT) => Iterable<IdT>): NodeSlotDescriptor<IdT, DataT>;