export type PipelineOpts<TValue> = {
    beforeStep?: (args: TValue, index: number, arr: PipelineStep<TValue>[]) => void | PromiseLike<void>;
    afterStep?: (args: TValue, index: number, arr: PipelineStep<TValue>[]) => void | PromiseLike<void>;
};
export type PipelineStep<TValue> = (acc: TValue, index: number, arr: PipelineStep<TValue>[]) => TValue | PromiseLike<TValue>;
export declare function pipeline<TValue>(steps: PipelineStep<TValue>[], initialValue: TValue, opts?: PipelineOpts<TValue>): Promise<TValue>;