import type { ZodIssue } from 'zod';
/** A flattened Zod issue suitable for cross-transport serialization. */
export type ValidationIssue = {
    readonly path: ReadonlyArray<string | number>;
    readonly message: string;
    readonly code: string;
};
/**
 * Convert a Zod issue into the stable diagnostic shape used by core validators.
 * Path segments outside the JSON-friendly string and number forms are rendered
 * with their string representation, preserving the original issue order.
 */
export declare function flattenZodIssue(issue: ZodIssue): ValidationIssue;