/**
 * Graph Validation Engine
 *
 * Validates a parsed graph schema for correctness, checking field types,
 * directive references, relation targets, and modifier consistency.
 *
 * @packageDocumentation
 */
import type { ParsedGraph, ParsedEntity, ValidationResult, ValidationError } from './types.js';
/**
 * Validate a single entity within the graph
 *
 * @param entity - The entity to validate
 * @param graph - The full graph for cross-entity checks
 * @returns Errors and warnings found
 */
export declare function validateEntity(entity: ParsedEntity, graph: ParsedGraph): {
    errors: ValidationError[];
    warnings: ValidationError[];
};
/**
 * Validate an entire parsed graph schema
 *
 * Checks all entities for:
 * - Unknown field types
 * - Invalid directive field references ($partitionBy, $index, $fts, $vector)
 * - Relation targets referencing non-existent entities
 * - Conflicting modifiers (! + ?)
 *
 * @param graph - The parsed graph to validate
 * @returns Validation result with errors and warnings
 *
 * @example
 * ```ts
 * const schema = Graph({
 *   User: { name: 'string', email: 'string!' },
 *   Post: { title: 'string', author: '->User' },
 * })
 * const result = validateGraph(schema)
 * if (!result.valid) {
 *   console.error('Validation errors:', result.errors)
 * }
 * ```
 */
export declare function validateGraph(graph: ParsedGraph): ValidationResult;
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