import { ZodTypeAny } from "zod";
/**
 * Recursively extracts custom type definitions from a Zod schema and collects them into a
 * definitions object.
 *
 * This function traverses the provided Zod schema and its nested schemas to collect all schemas
 * that have a custom `typeName` defined in `schema._zod2x.typeName`. It accumulates these
 * schemas into a `definitions` object, which maps each `typeName` to its corresponding schema.
 * This is useful for generating JSON Schema definitions or for any scenario where you need to
 * collect and reference custom types.
 *
 * @param schema - The root Zod schema from which to extract definitions.
 * @param definitions - (Optional) An object to accumulate the definitions.
 *                      Used across recursive calls.
 * @param visited - (Optional) A Set to keep track of visited schemas and prevent infinite recursion
 *                  in cases of circular references. Used across recursive calls.
 * @returns An object containing all extracted definitions, where each key is a `typeName` and the
 *          value is the corresponding Zod schema.
 */
export declare function zod2JsonSchemaDefinitions(schema: ZodTypeAny, definitions?: Record<string, any>, visited?: Set<ZodTypeAny>): Record<string, any>;