Support `ReadableStream.from`

[turbocrime]

available in firefox since 117 and node since 20.6.0, but chrome support for this has stalled https://issues.chromium.org/issues/40267032

typescript polyfill meeting spec https://streams.spec.whatwg.org/#readable-stream-from-iterable

declare global {
  interface ReadableStream<R = any> {
    from<T>(iterable: Iterable<T> | AsyncIterable<T>): ReadableStream<T>;
  }
}

if (!('from' in ReadableStream)) {
  Object.defineProperty(ReadableStream, 'from', {
    enumerable: true,
    configurable: true,
    writable: true,
    value: from,
  });
}

function from<T>(iterable: Iterable<T> | AsyncIterable<T>): ReadableStream<T> {
  const iterator = (
    Symbol.asyncIterator in iterable ? iterable[Symbol.asyncIterator] : iterable[Symbol.iterator]
  )();

  return new ReadableStream(
    {
      async pull(cont) {
        const result = await iterator.next();
        if (result.done) {
          cont.close();
        } else {
          cont.enqueue(result.value);
        }
      },

      async cancel(reason) {
        await iterator.return?.(reason);
      },
    },
    { highWaterMark: 0 },
  );
}

[zloirock]

core-js still does not polyfill even streams at all. The current core-js scope is ECMAScript and some directly related features. However, it's planned to expand to such features. So when other features on that are based this feature will be added, it can be added too.