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react-native/babel-preset
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Janic Duplessis 36893ecfa0 Enable strict mode for transform-es2015-modules-commonjs 
Summary:Since #5422 react-native works with strict mode modules but the transform was not updated since Facebook has some non strict mode compatible internal modules. Now that #5214 has landed and it is easy to change the babel config I think we should enable it by default to make es2015 modules spec compliant.

Someone at Facebook will have to make the internal changes necessary to disable strict mode modules for their projects that use non strict mode compatible modules by including a .babelrc file with
``` json
{
  "presets": [
    "react-native"
  ],
  "plugins": [
    ["transform-es2015-modules-commonjs", { "strict": false, "allowTopLevelThis": true }]
  ]
}
```
before merging this.

We might also want to mention this in the breaking change section for the next release.
Closes https://github.com/facebook/react-native/pull/5796

Differential Revision: D3075802

fb-gh-sync-id: e807b67401107e1e944db38453e254025ce0a6c7
shipit-source-id: e807b67401107e1e944db38453e254025ce0a6c7
 		2016-03-21 06:24:31 -07:00
..
configs Enable strict mode for transform-es2015-modules-commonjs 2016-03-21 06:24:31 -07:00
lib Use "babel-preset-react-native" 2016-02-03 08:15:32 -08:00
transforms Adding 'transform-symbol-member' transform to preset. 2016-02-08 15:01:36 -08:00
README.md Use "babel-preset-react-native" 2016-02-03 08:15:32 -08:00
index.js Use "babel-preset-react-native" 2016-02-03 08:15:32 -08:00
package.json Update hot reloading dependencies 2016-03-11 16:28:21 -08:00
plugins.js Use "babel-preset-react-native" 2016-02-03 08:15:32 -08:00

README.md

babel-preset-react-native

Babel presets for React Native applications. React Native itself uses this Babel preset by default when transforming your app's source code.

If you wish to use a custom Babel configuration by writing a .babelrc file in your project's root directory, you must specify all the plugins necessary to transform your code. React Native does not apply its default Babel configuration in this case. So, to make your life easier, you can use this preset to get the default configuration and then specify more plugins that run before it.

Usage

As mentioned above, you only need to use this preset if you are writing a custom .babelrc file.

Installation

Install babel-preset-react-native in your app:

npm i babel-preset-react-native --save-dev

Configuring Babel

Then, create a file called .babelrc in your project's root directory. The existence of this .babelrc file will tell React Native to use your custom Babel configuration instead of its own. Then load this preset:

{
  "presets": ["react-native"]
}

You can further customize your Babel configuration by specifying plugins and other options. See Babel's .babelrc documentation to learn more.

Help and Support

If you get stuck configuring Babel, please ask a question on Stack Overflow or find a consultant for help. If you discover a bug, please open up an issue.