Function _write

lib/internal/streams/iter/classic.js:773–793

(chunk, encoding, cb)

  // from _write/_writev/_final callbacks.

  function _write(chunk, encoding, cb) {
    const bytes = typeof chunk === 'string' ?
      Buffer.from(chunk, encoding) : chunk;
    if (hasWriteSync) {
      try {
        if (writer.writeSync(bytes)) {
          queueMicrotask(cb);
          return;
        }
        // WriteSync returned false: not accepted, fall through to async.
      } catch (err) {
        cb(err);
        return;
      }
    }
    try {
      PromisePrototypeThen(writer.write(bytes), () => cb(), cb);
    } catch (err) {
      cb(err);
    }
  }

  function _writev(entries, cb) {
    const chunks = [];