test/parallel/test-stream3-pipeline-async-iterator.js


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/* eslint-disable node-core/require-common-first, require-yield */
'use strict';
const { pipeline } = require('node:stream/promises');
{
  // Ensure that async iterators can act as readable and writable streams
  async function* myCustomReadable() {
    yield 'Hello';
    yield 'World';
  }

  const messages = [];
  async function* myCustomWritable(stream) {
    for await (const chunk of stream) {
      messages.push(chunk);
    }
  }

  (async () => {
    await pipeline(
      myCustomReadable,
      myCustomWritable,
    );
    // Importing here to avoid initializing streams
    require('assert').deepStrictEqual(messages, ['Hello', 'World']);
  })()
  .then(require('../common').mustCall());
}