Requiring unknown module "undefined"

[jkbreunig]

Error after upgrading 0.54.0 from 0.53.3.

Requiring unknown module "undefined".If you are sure the module is there, try restarting Metro Bundler. You may also want to run yarn, or npm install (depending on your environment).
handleException @ ExceptionsManager.js:65
handleError @ InitializeCore.js:115
reportFatalError @ error-guard.js:44
guardedLoadModule @ require.js:141
_require @ require.js:130
executeApplicationScript @ debuggerWorker.js:40
(anonymous) @ debuggerWorker.js:65
ExceptionsManager.js:65 Module AppRegistry is not a registered callable module (calling runApplication)

Environment

Environment:
OS: macOS High Sierra 10.13.3
Node: 8.9.4
Yarn: 1.5.1
npm: 5.6.0
Watchman: 4.9.0
Xcode: Xcode 9.2 Build version 9C40b
Android Studio: 3.0 AI-171.4443003

Packages: (wanted => installed)
react: ^16.3.0-alpha.1 => 16.3.0-alpha.1
react-native: 0.54.0 => 0.54.0

Expected Behavior

App should launch

Actual Behavior

UnknownModuleError

Steps to Reproduce

react-native run-android

[Jeepeng]

Same problem

[almostintuitive]

Same here! This is a blocking issue for us.

[mobdim]

Same problem. A few days can't solve.

[HumanUndead]

same problem, stuck too

[Maydar]

same issue

[hugoskwirrel]

react-native-maps/react-native-maps#2051 (comment)

[hramos]

Can you clarify - this happens on a brand new project?

[HumanUndead]

this happens after upgrading from 0.53.3 to 0.54 not on the whole project but some screens

[HumanUndead]

ok fixed my problem, in my case it was An import for a component using relative path, instead of the @ way. replacing that fixed it

[cipriancaba]

@HumanUndead Do you have an example of what your problem is? I have a simple class export that is failing with undefined

export class TouchableOpacityWebSafe extends Component { ... }

and importing with

import { TouchableOpacityWebSafe } from '../../components/webSafe/TouchableOpacityWebSafe'

fails.

This happened after upgrade from 0.53.3 to 0.54

[HumanUndead]

Fix your import, dont use ../../ for your import, use @.

[cipriancaba]

How would that work? This is a relative path in my custom components.. It's not related to any package.. Maybe I'm missing something about the @ import syntax?

[HumanUndead]

Place a packages.json file in your components folder, give it name: ‘components’
Then you can use the @ import syntax

[cipriancaba]

Even if that might work, I don't think this is the solution for the problem.. The problem is that the imports are failing and I don't really understand why..

Reverted to 0.53.3 for now..

[HumanUndead]

It will work but its up to you