nstdlib-nightly/lib/stream/promises.mjs

Node.js standard library converted to runtime-agnostic ES modules.

// Source: https://github.com/nodejs/node/blob/65eff1eb/lib/stream/promises.js

import {
  isIterable,
  isNodeStream,
  isWebStream,
} from "nstdlib/lib/internal/streams/utils";
import { pipelineImpl as pl } from "nstdlib/lib/internal/streams/pipeline";
import { finished } from "nstdlib/lib/internal/streams/end-of-stream";
import * as __hoisted_stream__ from "nstdlib/stub/stream";

__hoisted_stream__;

function pipeline(...streams) {
  return new Promise((resolve, reject) => {
    let signal;
    let end;
    const lastArg = streams[streams.length - 1];
    if (
      lastArg &&
      typeof lastArg === "object" &&
      !isNodeStream(lastArg) &&
      !isIterable(lastArg) &&
      !isWebStream(lastArg)
    ) {
      const options = Array.prototype.pop.call(streams);
      signal = options.signal;
      end = options.end;
    }

    pl(
      streams,
      (err, value) => {
        if (err) {
          reject(err);
        } else {
          resolve(value);
        }
      },
      { signal, end },
    );
  });
}

export { finished };
export { pipeline };