/**
 * Validates and converts a user-provided function string into an executable function.
 *
 * @param {string} code - The user-provided function code as a string.
 * @returns {((formData: Record<string, any>) => void) | null} - The validated function or null if invalid.
 */
export declare function validateUserFunction(code: string): ((formData: Record<string, any>) => void) | null;
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