undefined is not an object (evaluating 'regeneratorRuntime.mark') in react native on generator functions

when exporting a generator function * () {}

e.g.

export default function() * {}

(which is common when using redux-saga)

this error is thrown in the app when its started with storybook: undefined is not an object (evaluating 'regeneratorRuntime.mark')

looks like this issue: https://github.com/facebook/react-native/issues/14838

but all the solution do not work as every babel plugin is installed and even in newer versions. Any idea whats wrong?

[matt-oakes]

To fix this I needed to create another .babelrc in the /storybook directory with this content:

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

I had to do this even though I had the same file in the root of the project. It doesn’t seem to pick this one up.

This workaround is ok, but if possible I think the packager should be able to pick up the babel config from the root repo to avoid duplication and potential issues when it is changed.

[stale[bot]]

Hey there, it’s me again! I am going close this issue to help our maintainers focus on the current development roadmap instead. If the issue mentioned is still a concern, please open a new ticket and mention this old one. Cheers and thanks for using Storybook!