# @google-cloud/promisify > A simple utility for promisifying and callbackifying functions and classes. Google Cloud Common node.js module contains stuff used by other Cloud API modules. * [github.com/googlecloudplatform/google-cloud-node](https://github.com/googlecloudplatform/google-cloud-node) Read more about the client libraries for Cloud APIs, including the older Google APIs Client Libraries, in [Client Libraries Explained][explained]. [explained]: https://cloud.google.com/apis/docs/client-libraries-explained ### Installing the package It's unlikely you will need to install this package directly, as it will be installed as a dependency when you install other `@google-cloud` packages. ## Versioning This library follows [Semantic Versioning](http://semver.org/). This library is considered to be in **alpha**. This means it is still a work-in-progress and under active development. Any release is subject to backwards-incompatible changes at any time. More Information: [Google Cloud Platform Launch Stages][launch_stages] [launch_stages]: https://cloud.google.com/terms/launch-stages ## Contributing Contributions welcome! See the [Contributing Guide](https://github.com/googleapis/nodejs-promisify/blob/master/CONTRIBUTING.md). ## License Apache Version 2.0 See [LICENSE](https://github.com/googlecloudplatform/google-cloud-node/blob/master/LICENSE)