import type { ZodTypeAny } from 'zod';
/**
 * @deprecated Conform strip empty string to undefined by default
 */
export declare function ifNonEmptyString(fn: (text: string) => unknown): (value: unknown) => unknown;
export type DefaultCoercionType = 'string' | 'file' | 'number' | 'boolean' | 'date' | 'bigint';
export type CoercionFunction = (value: unknown) => unknown;
/**
 * Reconstruct the provided schema with additional preprocessing steps
 * This strips empty values to undefined and coerces string to the correct type
 */
export declare function enableTypeCoercion<Schema extends ZodTypeAny>(type: Schema, options: {
    cache: Map<ZodTypeAny, ZodTypeAny>;
    coerce: (type: ZodTypeAny) => CoercionFunction | null;
    stripEmptyValue: CoercionFunction;
}): ZodTypeAny;
/**
 * A helper that enhance the zod schema to strip empty value and coerce form value to the expected type with option to customize type coercion.
 * @example
 *
 * ```tsx
 * import { parseWithZod, unstable_coerceFormValue as coerceFormValue } from '@conform-to/zod';
 * import { z } from 'zod';
 *
 * // Coerce the form value with default behaviour
 * const schema = coerceFormValue(
 *   z.object({
 *     // ...
 *   })
 * );
 *
 * // Coerce the form value with default coercion overrided
 * const schema = coerceFormValue(
 *   z.object({
 *     ref: z.number()
 *     date: z.date(),
 *     amount: z.number(),
 *     confirm: z.boolean(),
 *   }),
 *   {
 *     // Trim the value for all string-based fields
 *     // e.g. `z.string()`, `z.number()` or `z.boolean()`
 *     string: (value) => {
 *       if (typeof value !== 'string') {
 *          return value;
 *       }
 *
 *       const result = value.trim();
 *
 *       // Treat it as `undefined` if the value is empty
 *       if (result === '') {
 *         return undefined;
 *       }
 *
 *       return result;
 *     },
 *
 *     // Override the default coercion with `z.number()`
 *     number: (value) => {
 *       // Pass the value as is if it's not a string
 *       if (typeof value !== 'string') {
 *         return value;
 *       }
 *
 *       // Trim and remove commas before casting it to number
 *       return Number(value.trim().replace(/,/g, ''));
 *     },
 *
 *     // Disable coercion for `z.boolean()`
 *     boolean: false,
 *   },
 * );
 * ```
 */
export declare function coerceFormValue<Schema extends ZodTypeAny>(type: Schema, options?: {
    defaultCoercion?: {
        [key in DefaultCoercionType]?: CoercionFunction | boolean;
    };
    customize?: (type: ZodTypeAny) => CoercionFunction | null;
}): Schema;