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stream: make streams thenable

Rodrigo Muino Tomonari requested to merge github/fork/nxtedition/stream-thenable into master

Make streams thenable as a shortcut to finished(stream).

Together with https://github.com/nodejs/node/pull/39029 this would provide a quite nice API without requiring importing helpers such as finished and pipeline.

e.g.

await Duplex.from(
  fs.createReadStream('file. txt'),
  createGzip(),
  fs.createWriteStream('file. txt.gz')
)

instead of:

for await (const dummy of Duplex.from(
  fs.createReadStream('file. txt'),
  createGzip(),
  fs.createWriteStream('file. txt.gz')
)) {
  // do nothing
}

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