import { JsonSchema, JsonSchemaNull } from "../../schemas/jsonSchema.schema.js";
import { CallableFunctionParameter } from "./CallableFunctionParameter.js";
export declare class CallableFunctionNull extends CallableFunctionParameter<JsonSchemaNull> {
    readonly type = "null";
    constructor(name: string, options?: Omit<JsonSchemaNull, "type">);
    static fromJSON(name: string, json: JsonSchemaNull): CallableFunctionNull;
    /**
     * Whether the given `JsonSchema` is a `JsonSchemaNull`.
     *
     * Note: This method does not check if the schema is valid, only if it has properties unique to null schemas.
     */
    static isNullSchema(json: JsonSchema): json is JsonSchemaNull;
    toJSON(): JsonSchemaNull;
}