import type { DocumentContext } from "../../document/index.js";
import { AbstractJsonable } from "../abstractJsonable.js";
import type { JsonNull } from "../jsonTypes.js";
export declare class NullJsonable extends AbstractJsonable {
    readonly type: "null";
    constructor(probability: number | undefined, weight: number | undefined);
    protected toJSONImpl(keyOrIndex: string | number, context: DocumentContext): JsonNull | undefined;
}