/**
 * Simple implementation of the deferred pattern.
 * An object that exposes a promise and functions to resolve and reject it.
 */
export declare class Deferred<T> {
    resolve: (value?: T | PromiseLike<T>) => void;
    reject: (err?: any) => void;
    promise: Promise<T>;
}
export declare function pSeries<T>(tasks: Iterable<() => Promise<T> | T>): Promise<T[]>;
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