nodejs-spawn-via-web-streams.mjs

import {Readable} from 'node:stream';
import {TextDecoderStream} from 'node:stream/web';
import {spawn} from 'node:child_process';

const childProcess = spawn(
  'echo', ['hello world'],
  {
    stdio: ['ignore', 'pipe', 'inherit'],
  }
);
const nodeReadable = childProcess.stdout;

// Reading from `nodeReadable` (e.g. via async iteration) produces buffers.
// (I couldn’t find a way to change that).
// That leads to `Readable.toWeb(nodeReadable)` creating a stream that produces
// instances of `Uint8Array`. Hence the `TextDecoderStream`!
const webReadable = Readable.toWeb(nodeReadable).pipeThrough(new TextDecoderStream('utf-8'));
for await (const chunk of webReadable) {
  console.log(chunk);
}

I tried your code but get this error:

TypeError: Readable.toWeb is not a function

Try using this code:

`
nodeReadable.setEncoding('utf8');

for await (const chunk of nodeReadable) {
  console.log(chunk); // hello world
}

`

or also:

for await (const chunk of nodeReadable) { console.log(chunk.toString()); // hello world }

@manwey You need to run Node.js v17.0.0 or later: https://nodejs.org/api/stream.html#streamreadabletowebstreamreadable

The goal of this experiment was to use the new web streams API: https://nodejs.org/api/webstreams.html

Thanks @rauschma I will give a try.

Did you try my code to get utf8 strings from the buffers?