/**
 * Represents an edge (connection) in the SQL data flow diagram
 */
export interface DataFlowEdge {
    from: string;
    to: string;
    label?: string;
}
/**
 * Represents a connection between nodes in the data flow
 */
export declare class DataFlowConnection implements DataFlowEdge {
    from: string;
    to: string;
    label?: string | undefined;
    constructor(from: string, to: string, label?: string | undefined);
    getMermaidRepresentation(): string;
    static create(from: string, to: string, label?: string): DataFlowConnection;
    static createWithNullability(from: string, to: string, isNullable: boolean): DataFlowConnection;
}
/**
 * Collection of edges with utilities for managing connections
 */
export declare class DataFlowEdgeCollection {
    private edges;
    private connectionSet;
    add(edge: DataFlowConnection): void;
    addConnection(from: string, to: string, label?: string): void;
    addJoinConnection(from: string, to: string, isNullable: boolean): void;
    hasConnection(from: string, to: string): boolean;
    getAll(): DataFlowConnection[];
    getMermaidRepresentation(): string;
}