export interface Graph<V, W> {
    addVertex(vertex: V): void;
    removeVertex(vertex: V): void;
    addEdge(from: V, to: V, weight?: W): void;
    removeEdge(from: V, to: V): void;
    getNeighbors(vertex: V): V[];
    getEdgeWeight(from: V, to: V): W;
    getVertices(): V[];
    hasVertex(vertex: V): boolean;
    hasEdge(from: V, to: V): boolean;
    vertexCount(): number;
    edgeCount(): number;
    clear(): void;
}