import { ZodNullableDef } from "zod";
import { JsonSchema7Type } from "../parseDef";
import { Refs } from "../Refs";
import { JsonSchema7NullType } from "./null";
export type JsonSchema7NullableType = {
    anyOf: [JsonSchema7Type, JsonSchema7NullType];
} | {
    type: [string, "null"];
};
export declare function parseNullableDef(def: ZodNullableDef, refs: Refs): JsonSchema7NullableType | undefined;