import { Observable } from 'rxjs';
export interface TaskInterface<T> {
    cancel(withError?: Error): void;
    execute(): Observable<T>;
    toObservable(): Observable<T>;
}
export declare class TaskError extends Error {
    code: TaskError.Code;
    constructor(code: TaskError.Code, msg: string);
    static operationCancelled(task: TaskInterface<any>): TaskError;
}
export declare namespace TaskError {
    enum Code {
        TASK_OPERATION_CANCELLED = "TASK_OPERATION_CANCELLED"
    }
}