In order to be able to use [Yarn 4](https://yarnpkg.com/blog/release/4.0) to build your node projects, you will need to add the following commands to your build pipeline:

```bash
source /opt/nvm/nvm.sh
nvm install 18
nvm use 18

corepack enable
corepack prepare yarn@4.8.1 --activate
yarn --version
```

Note: DeployHQ build servers come with NVM (Node Version Manager) 0.40.3 pre-installed, so you can directly source it from `/opt/nvm/nvm.sh` without needing to install it first.

**What's new in Yarn 4?**

-   **Enhanced Plug'n'Play (PnP):** It heavily leverages PnP, reducing dependency size and speeding up installations.
-   **Stronger Security:** It includes features like "Hardened Mode" to protect against supply chain attacks.
-   **Corepack Integration:** It emphasizes Corepack for consistent package manager versions.
-   **Improved Performance:** It has performance optimizations, like a new package metadata cache.
-   **Modernizing Yarn:** Requires Node.js 18+ to leverage newer javaScript features.

Happy deploying!