Function onfinished

lib/internal/streams/duplexify.js:272–281

(err)

  let d;

  function onfinished(err) {
    const cb = onclose;
    onclose = null;

    if (cb) {
      cb(err);
    } else if (err) {
      d.destroy(err);
    }
  }

  // TODO(ronag): Avoid double buffering.
  // Implement Writable/Readable/Duplex traits.