New react-native app has 'TypeError: babelHelpers.typeof is not a function' [iOS]

Question

A new project created with the latest version of react-native throws javascript error while running(/debugging). Tested this on simulator.

[fatal][tid:main]         


        

Answer 1

Here's a comment explaining the issue:

https://github.com/facebook/react-native/issues/4844#issuecomment-204035720

To summarize:

Babel presets 'stage-0' through 'stage-3' contain 'async-to-generator', which is not not necessary for react-native itself.

The solution is to use the unofficial babel preset 'react-native-stage-0'

Example:

npm install babel-preset-react-native-stage-0 --save-dev

.babelrc

{
  "presets": ["react-native-stage-0"]
}

or with decorator support

{
  "presets": ["react-native-stage-0/decorator-support"]
}

Empty cache and Restart

watchman watch-del-all

./node_modules/react-native/packager/packager.sh start --reset-cache