import 'reflect-metadata';
import { WorkflowVirtualMachine } from '../WorkflowVirtualMachine.js';
export declare abstract class Activity {
    private static _version;
    private readonly _children;
    private _parent;
    constructor(...children: ReadonlyArray<Activity>);
    static getActivityConstructor(activityUUID: string): Activity.Constructor;
    static getActivityUUID(activityConstructor: Activity.Constructor): string;
    static registerActivity(activityUUID: string, activityConstructor: Activity.Constructor): void;
    static get appVersion(): string;
    static set appVersion(version: string);
    get activityUUID(): string;
    get children(): ReadonlyArray<Activity>;
    get oid(): string;
    get parent(): Activity;
    get root(): Activity;
    private static setParent;
}
export declare namespace Activity {
    function Id(activityUUID: string): ClassDecorator;
    interface Constructor extends Function {
        new <T extends Activity>(): T;
        new <T extends Activity>(...children: ReadonlyArray<Activity>): T;
    }
}
export declare class ActivityElement<TActivity extends Activity> {
    private readonly _stackFrame;
    constructor(stackFrame: WorkflowVirtualMachine.StackFrame<TActivity>);
    /**
     * Gets reference to an Activity related to the current current element
     */
    get activity(): TActivity;
    /**
     * Gets an instance of ExecutionContext related to the current element
     */
    protected get vmContext(): WorkflowVirtualMachine.Context;
}
export declare function activityRecursiveWalker(activity: Activity, 
/**
 * Return `false` from callback function to stop walking
 */
callback: (walk: Activity, indexPath: ReadonlyArray<number>) => boolean): void;