import { Core, AlphaCtx } from "../../core";
import { Env } from "../../env";
import * as Exps from "../../exps";
export declare abstract class ClsCore extends Core {
    instanceofExpsCls: boolean;
    abstract append(cls: Exps.ClsCore): Exps.ClsCore;
    abstract field_names: Array<string>;
    abstract evaluate(env: Env): Exps.ClsValue;
    abstract fields_repr(): Array<string>;
    abstract fields_alpha_repr(ctx: AlphaCtx): Array<string>;
}