import type { EntityTypeConfig } from './entity-type-config.js';
export interface ValidationError {
    field: string;
    message: string;
    value?: unknown;
}
/**
 * Validate entity fields against the type's schema.
 *
 * @param meta - The entity metadata (frontmatter fields)
 * @param typeConfig - The entity type configuration with field definitions
 * @param isCreate - If true, checks required fields; if false (update), skips required checks
 * @param onlyFields - If provided, only validate these field keys (useful for patch updates)
 * @returns Array of validation errors (empty if valid)
 */
export declare function validateEntity(meta: Record<string, unknown>, typeConfig: EntityTypeConfig, isCreate: boolean, onlyFields?: Set<string>): ValidationError[];
/**
 * Format validation errors into a human-readable string.
 */
export declare function formatValidationErrors(errors: ValidationError[]): string;
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