import { BaseTask } from "../BaseTask";
import { Task } from "../Task";
import { TaskStatus } from "../TaskStatus";
/**
 * A LeafTask is a terminal task of a behavior tree,
 * contains action or condition logic, can not have any child.
 */
export declare abstract class LeafTask<T> extends BaseTask<T> {
    /**
     * This method contains the update logic of this leaf task.
     * The actual implementation msut return Running, Succeeded or Failed.
     */
    abstract execute(): TaskStatus;
    run(): void;
    addChild(child: Task): this;
    getChildCount(): number;
    getChild(index: number): Task;
    childSuccess(runningTask: Task): void;
    childFail(runningTask: Task): void;
    childRunning(runningTask: Task, reporter: Task): void;
}