React-native: bundling failed: NotFoundError: Cannot find entry file index.js in any of the roots

[ryota-murakami]

Is this a bug report?

No

Have you read the Contributing Guidelines?

Yes

Environment

Environment:
OS: macOS High Sierra 10.13.2
Node: 9.4.0
Yarn: 1.3.2
npm: 5.6.0
Watchman: 4.9.0
Xcode: Xcode 9.2 Build version 9C40b

Packages: (wanted => installed)
react-native: 0.52.0
react: 16.2.0

Target Platform: iOS (11.2)

Steps to Reproduce

Before, I was rm -rf ios and update react-native 0.51.0 -> 0.52.0 and run react-native upgrade,
in order to attempt fixing IOS simulator extreamly slow problem.
(finaly, it cause Simulator -> Debug -> Slow Animations checked)

1. yarn start (node node_modules/react-native/local-cli/cli.js start)
2. yarn run-ios (node_modules/.bin/react-native run-ios)
3. facing bundling failed: NotFoundError: Cannot find entry file index.js in any of the roots

Expected Behavior

react-native server detect index.ios.js and bundle it.

Actual Behavior

react-native server doesn't detect index.ios.js and faild bundle it.

i don't know why react-native server say index.js file? without my index.ios.js.
whatever, have you any advice anyone?
thank you so mush:bow:

[arma7x]

Breaking changes and deprecations in v0.49

[ryota-murakami]

@arma7x

It’s my fault about all...
thanks!

[guyzmo]

I just ran into the same issue after upgrading my project from <0.49 into >0.50.

I used the react-native-git-upgrade tool. It would have been lovely if it could handle the indexes merge automagically, and/or have the react-native tool show an error (or warning) to merge both indexes into a single index.

TBH, I might have chased my tail longer if it wasn't for this issue. Thanks @ryota-murakami and @arma7x !