import { STObject } from "./STObject";
/**
 * A Smalltalk object representing "nothing".
 * Similar to null/void in other languages.
 *
 * Tracks it's creator to ease debugging.
 */
export declare class STNil extends STObject {
    private static INSTANCE;
    private creator;
    constructor(creator: string | STObject);
    getClassName(): string;
    toString(): string;
    isNil(): boolean;
    /**
     * Fetches an anonymous instance of STNil.
     *
     * You should prefer to use the constructor
     * over this function.
     */
    static getAnonymously(): STNil;
}