import type { FlowDefinition } from '../types.js';
import type { FlowValidationIssue } from './types.js';
export interface StructureNode {
    id: string;
    path: string;
    index: number;
    kind: string;
    replyMode?: 'response' | 'generate' | 'both' | 'neither';
    opaque?: boolean;
}
export interface StructureTransition {
    path: string;
    nodeId: string;
    goto?: string;
}
export interface StructureGraph {
    start: string;
    nodes: StructureNode[];
    transitions: StructureTransition[];
}
export declare function validateFlowStructureGraph(graph: StructureGraph): FlowValidationIssue[];
export declare function validateFlowStructure(def: FlowDefinition): FlowValidationIssue[];