import { Sigma } from './sigma.js';
export declare class PdgNode {
    readonly nid: number;
    readonly cls: string;
    readonly op: string | null;
    constructor(nid: number, cls: string, op?: string | null);
    get label(): string;
}
export declare class PdgEdge {
    readonly src: number;
    readonly dst: number;
    readonly etype: string;
    constructor(src: number, dst: number, etype: string);
}
export declare class PDG {
    readonly sigma: Sigma;
    private readonly _nodes;
    private readonly _edges;
    private _nextId;
    constructor(sigma: Sigma);
    addNode(cls: string, op?: string | null): number;
    addEdge(src: number, dst: number, etype?: string): void;
    get nodes(): PdgNode[];
    get edges(): PdgEdge[];
    node(nid: number): PdgNode;
    get length(): number;
    /**
     * Typed, directed neighborhood of `nid` for WL aggregation.
     * Returns tuple list of [direction, edge_type, other_id].
     */
    neighbors(nid: number): [string, string, number][];
    toDict(): Record<string, any>;
    labelMultiset(): Record<string, number>;
}
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