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// Copyright (c) 2017-2022 Cloudflare, Inc.
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// Licensed under the Apache 2.0 license found in the LICENSE file or at:
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//     https://opensource.org/licenses/Apache-2.0
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//
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// Copyright Joyent, Inc. and other Node contributors.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to permit
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// persons to whom the Software is furnished to do so, subject to the
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// following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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// USE OR OTHER DEALINGS IN THE SOFTWARE.
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import { isIterable, isNodeStream } from 'node-internal:streams_util';
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import { finished } from 'node-internal:streams_end_of_stream';
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import { pipelineImpl as pl } from 'node-internal:streams_pipeline';
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export { finished };
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export function pipeline(...streams: unknown[]): Promise<unknown> {
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  return new Promise((resolve, reject) => {
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    let signal: AbortSignal | undefined;
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    let end: boolean | undefined;
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    const lastArg = streams[streams.length - 1];
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    if (
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      lastArg &&
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      typeof lastArg === 'object' &&
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      !isNodeStream(lastArg) &&
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      !isIterable(lastArg)
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    ) {
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      const options = streams.pop() as { signal?: AbortSignal; end?: boolean };
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      signal = options.signal;
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      end = options.end;
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    }
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    pl(
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      streams,
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      (err: Error | null, value: unknown) => {
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        if (err) {
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          reject(err);
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        } else {
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          resolve(value);
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        }
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      },
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      {
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        signal,
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        end,
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      }
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    );
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  });
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}
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export const promises = {
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  pipeline,
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  finished,
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};