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# @vue/cli-plugin-babel
> babel plugin for vue-cli
## Configuration
Uses Babel 7 + `babel-loader` + [@vue/babel-preset-app](https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/babel-preset-app) by default, but can be configured via `babel.config.js` to use any other Babel presets or plugins.
By default, `babel-loader` excludes files inside `node_modules` dependencies. If you wish to explicitly transpile a dependency module, you will need to add it to the `transpileDependencies` option in `vue.config.js`:
``` js
module.exports = {
transpileDependencies: [
// can be string or regex
'my-dep',
/other-dep/
]
}
```
## Caching
[cache-loader](https://github.com/webpack-contrib/cache-loader) is enabled by default and cache is stored in `<projectRoot>/node_modules/.cache/babel-loader`.
## Parallelization
[thread-loader](https://github.com/webpack-contrib/thread-loader) is enabled by default when the machine has more than 1 CPU cores. This can be turned off by setting `parallel: false` in `vue.config.js`.
`parallel` should be set to `false` when using Babel in combination with non-serializable loader options, such as regexes, dates and functions. These options would not be passed correctly to `babel-loader` which may lead to unexpected errors.
## Installing in an Already Created Project
``` sh
vue add babel
```
## Injected webpack-chain Rules
- `config.rule('js')`
- `config.rule('js').use('babel-loader')`
- `config.rule('js').use('cache-loader')`
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