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# Target browsers
By default webpacker provides these front-end tools:
- [@babel/preset-env](https://github.com/babel/babel/tree/master/packages/babel-preset-env)
- [Autoprefixer](https://github.com/postcss/autoprefixer)
- [postcss-preset-env](https://github.com/csstools/postcss-preset-env)
All these tools use [Browserslist](https://github.com/browserslist/browserslist) to detect which environment your users have
Webpacker browserslist default target:
```
defaults
```
`defaults`: `(> 0.5%, last 2 versions, Firefox ESR, not dead)`, [browserl.ist](https://browserl.ist/) is an online tool to check what browsers will be selected by some query.
To keep browsers data up to date, you need to run:
```bash
yarn upgrade caniuse-lite
```
at least once every few months, to prevent such [problems](https://github.com/browserslist/browserslist/issues/492)
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