import { CompositeTask } from "./composite-task";
import { Task } from "./task";
/**
 * A task that completes when all of its child tasks complete
 */
export declare class WhenAllTask<T> extends CompositeTask<T[]> {
    constructor(tasks: Task<T>[]);
    pendingTasks(): number;
    onChildCompleted(task: Task<any>): void;
    get completedTasks(): number;
}