import type { ZodTypeAny } from 'zod';
import type { ValidationAttributes } from '@conform-to/dom/future';
/**
 * Type guard to check if a value is a Zod schema.
 */
export declare function isSchema(schema: unknown): schema is ZodTypeAny;
/**
 * Extracts HTML validation attributes from a Zod schema.
 */
export declare function getConstraints(schema: unknown): Record<string, ValidationAttributes> | undefined;
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