/**
 * Base class and utilities for storage adapters
 *
 * @packageDocumentation
 */
import type { SkillNode, SkillNodeInput, PrerequisiteEdge, PrerequisiteEdgeInput, GraphStats } from '../types/index.js';
/**
 * Generate a unique ID with optional prefix
 */
export declare function generateId(prefix?: string): string;
/**
 * Get current ISO timestamp
 */
export declare function nowISO(): string;
/**
 * Convert SkillNodeInput to full SkillNode with generated fields
 */
export declare function inputToSkillNode(input: SkillNodeInput): SkillNode;
/**
 * Convert PrerequisiteEdgeInput to full PrerequisiteEdge with generated fields
 */
export declare function inputToEdge(input: PrerequisiteEdgeInput): PrerequisiteEdge;
/**
 * Validate skill input data
 */
export declare function validateSkillInput(input: SkillNodeInput): void;
/**
 * Validate edge input data
 */
export declare function validateEdgeInput(input: PrerequisiteEdgeInput): void;
/**
 * Ensure adapter is connected before operations
 */
export declare function requireConnection(connected: boolean): void;
/**
 * Calculate graph statistics from nodes and edges
 */
export declare function calculateStats(nodes: SkillNode[], edges: PrerequisiteEdge[]): GraphStats;
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