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Tweak uglify option docs (#368)

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Brian Ng 2017-07-03 13:07:39 -05:00 committed by GitHub
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10
experimental/babel-preset-env/README.md
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@ -124,13 +124,15 @@ Note, browsers' results are overridden by explicit items from `targets`.
### `targets.uglify`
`number | true`
`true`
UglifyJS does not currently support any ES6 syntax, so if you are using Uglify to minify your code, targeting later browsers may cause Uglify to throw syntax errors.
When using `uglify-js` to minify your code, you may run into syntax errors when targeting later browsers since `uglify-js` does not support any ES2015+ syntax.
To prevent these errors - specify the uglify option, which will enable all plugins and, as a result, fully compile your code to ES5. However, the `useBuiltIns` option will still work as before, and only include the polyfills that your target(s) need.
To prevent these errors - set the `uglify` option to `true`, which enables all transformation plugins and as a result, your code is fully compiled to ES5. However, the `useBuiltIns` option will still work as before and only include the polyfills that your target(s) need.
> NOTE: Uglify has a work-in-progress "Harmony" branch to address the lack of ES6 support, but it is not yet stable. You can follow its progress in [UglifyJS2 issue #448](https://github.com/mishoo/UglifyJS2/issues/448). If you require an alternative minifier which _does_ support ES6 syntax, we recommend using [Babili](https://github.com/babel/babili).
> Uglify has support for ES2015 syntax via [uglify-es](https://github.com/mishoo/UglifyJS2/tree/harmony). If you are using syntax unsupported by `uglify-es`, we recommend using [Babili](https://github.com/babel/babili).
> Note: This option is deprecated in 2.x and replaced with a [`forceAllTransforms` option](https://github.com/babel/babel-preset-env/pull/264).
### `spec`