我在你的代码中添加了一个writableStream，它可以像你预期的那样工作：

import { pipeline } from 'stream/promises';
import { Writable } from 'stream';

async function* func() {
  for (let i = 0; i < 200; i++) {
    console.log(`func ${i}`)
    yield i;
  }
}

async function* func2(iterator: AsyncIterable<number>) {
  for await (let i of iterator) {
    console.log(`func2 ${i}`);
    yield i;
  }
}
async function* func3(iterator: AsyncIterable<number>) {
  for await (let i of iterator) {
    console.log(`func3 ${i}`);
    yield i.toString();
  }
}

const writableStream = new Writable({
  write(chunk, encoding, callback) {
    callback();
  }
});

async function main() {
  try {
    await pipeline(
      func,
      func2,
      func3,
      writableStream
    );
    console.log('Pipeline finished successfully');
  } catch (e) {
    console.error('Pipeline failed', e);
  }
}

main();

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经过不断的调试，我找到了解决方案，它实际上很简单，哈哈。
解决方案是删除最后一个函数（即PipelineDestination）上的“yield”。
我相信发生的事情是，所有以前的数据只是在流中积累，因为没有消耗它们。

import { pipeline } from "stream/promises"

async function* func() {
  for (let i = 0; i < 200; i++) {
    console.log(`func ${i}`)
    yield i
  }
}
async function* func2(iterator: AsyncIterable<number>) {
  for await (let i of iterator) {
;    console.log(`func2 ${i}`)
    yield i
  }
}
async function* func3(iterator: AsyncIterable<number>) {
  for await (let i of iterator) {
    console.log(`func3 ${i}`)
    // yield i <---- I removed this!
  }
}

async function main() {
  await pipeline(
    func,
    func2,
    func3
  )
}

main();

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