/**
 * Graph connection URL parser — the DatabaseUrl sibling for graph engines.
 *
 * Parse a graph connection URL into its parts, the same way DatabaseUrl does for
 * SQL. `engine` is the CANONICAL name the factory selects an adapter by; a scheme
 * alias (bolt/neo4j/memgraph all speak Bolt/Cypher and share ONE adapter) resolves
 * to its engine here. See tina4-documentation/plan/v3/features/139-graph-databases.md.
 */
/** The canonical graph engine names. */
export type GraphEngine = "ultipa" | "bolt" | "arango";
/** A parsed graph URL: engine, host, port, graph, credentials, params. */
export declare class GraphUrl {
    readonly raw: string;
    readonly scheme: string;
    readonly engine: GraphEngine;
    readonly host: string;
    readonly port: number;
    /** The graph/database name (leading slash stripped), or null when absent. */
    readonly graph: string | null;
    readonly username: string | null;
    readonly password: string | null;
    readonly params: Record<string, string>;
    readonly useTls: boolean;
    constructor(url: string);
    /** host:port/graph — for messages, never carrying credentials. */
    getDsn(): string;
    static fromEnv(envKey?: string): GraphUrl | null;
}