copy docs/ja/core-plugins/babel.md

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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`.
+
+## 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')`