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# Yarn
Webpacker by default uses `yarn` as a package manager for `node_modules`
## Add a new npm module
To add any new JS module you can use `yarn`:
```bash
yarn add bootstrap material-ui
```
## Add an npm module to `devDependencies`
To add a new JS module that will only be available to local development:
```bash
yarn add --dev browser-sync
```
Be careful not to add any build or app related JS modules in this fashion. Adding JS modules to `devDependencies` [will block them from being installed in **any** production environment](https://yarnpkg.com/lang/en/docs/cli/install/#toc-yarn-install-production-true-false).
Docs from JS modules may instruct you to use `--dev` or `devDependencies`, but this is generally under the assumption that you are using a `node.js` workflow.
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