Function _writev

lib/internal/streams/iter/classic.js:795–819

(entries, cb)

  }

  function _writev(entries, cb) {
    const chunks = [];
    for (let i = 0; i < entries.length; i++) {
      const { chunk, encoding } = entries[i];
      chunks[i] = typeof chunk === 'string' ?
        Buffer.from(chunk, encoding) : chunk;
    }
    if (hasWritevSync) {
      try {
        if (writer.writevSync(chunks)) {
          queueMicrotask(cb);
          return;
        }
        // WritevSync returned false: not accepted, fall through to async.
      } catch (err) {
        cb(err);
        return;
      }
    }
    try {
      PromisePrototypeThen(writer.writev(chunks), () => cb(), cb);
    } catch (err) {
      cb(err);
    }
  }

  function _final(cb) {
    if (!hasEnd) {