/// <reference types="koa" />
import { KeyValue, Next } from '../../vision/types';
import { Logger } from '../logger/types';
import { TaskMiddleware } from './types';
export declare class TaskRunner {
    protected env: string;
    protected middleware: TaskMiddleware[];
    protected context: KeyValue;
    protected logger: Logger;
    constructor();
    use(fn: (context: KeyValue, next: Next) => void): TaskRunner;
    run(): Promise<void>;
    protected compose(middleware: TaskMiddleware[]): (context: KeyValue) => Promise<void>;
}