React packager hangs on transforming (100% 393/394) on demo app (Android).

[patscan]

Trying to run Android tutorial with Genymotion emulator.

OS X Yosemite
Genymotion

react-native run-android succeeds. Following along tutorial, successfully launches app in emulator until I get to this step:

var {
  AppRegistry,
  Image,
  StyleSheet,
  Text,
  View,
} = React;

App launches with red screen of death ("Unable to download JS bundle. Did you forget to start the development device..."). Noticing the following in react packager logs:

React packager ready.

[1:31:52 PM] <END>   Crawling File System (1102ms)
[1:31:52 PM] <START> Building in-memory fs for JavaScript
[1:31:54 PM] <END>   Building in-memory fs for JavaScript (2263ms)
[1:31:54 PM] <START> Building in-memory fs for Assets
[1:31:56 PM] <END>   Building in-memory fs for Assets (2149ms)
[1:31:56 PM] <START> Building Haste Map
[1:31:58 PM] <START> Building (deprecated) Asset Map
[1:31:59 PM] <END>   Building (deprecated) Asset Map (742ms)
[1:31:59 PM] <END>   Building Haste Map (2676ms)
[1:31:59 PM] <END>   Building Dependency Graph (8194ms)
[1:32:09 PM] <START> request:/index.android.bundle?platform=android&dev=true
[1:32:09 PM] <START> find dependencies
[1:32:09 PM] <END>   find dependencies (182ms)
[1:32:09 PM] <START> transform
transforming [========================================] 100% 393/394[1:32:44 PM] <START> request:/index.android.bundle?platform=android&dev=true

Note - hung on 393/394.

Sorry if I'm adding to noise and this issue is covered elsewhere. Seeing similar tickets that have been closed, but the adb reverse tcp:8081 tcp:8081 command isn't working for me (I believe that would only apply to actual hardware deploys anyway?)

Thanks in advance.

[facebook-github-bot]

Hey patscan, thanks for reporting this issue!

React Native, as you've probably heard, is getting really popular and truth is we're getting a bit overwhelmed by the activity surrounding it. There are just too many issues for us to manage properly.

• If you don't know how to do something or something is not working as you expect but not sure it's a bug, please ask on StackOverflow with the tag react-native or for more real time interactions, ask on Discord in the #react-native channel.
• If this is a feature request or a bug that you would like to be fixed, please report it on Product Pains. It has a ranking feature that lets us focus on the most important issues the community is experiencing.
• We welcome clear issues and PRs that are ready for in-depth discussion. Please provide screenshots where appropriate and always mention the version of React Native you're using. Thank you for your contributions!

[christopherdro]

@patscan Maybe its related to #5040?

[patscan]

@christopherdro Thanks for the reply. I am on 18.0-rc though, so I would think it should be resolved were it the same issue. Is there more logging I provide? I am not seeing the error from the second screenshot of the #5040 that explicitly points to babel, but perhaps I'm not knowing where to look.

[christopherdro]

I'm not sure tbh. It's just a similar one I saw earlier.

If your using redux, see #4674.

[patscan]

Thanks, I had come across both of these threads before posting, but I'm afraid neither seems to quite address this. I may post on stack overflow and see if others are seeing this behavior.

[gradddev]

I also have this problem with 18.0-rc.

[techmentormaria]

+1 18.0-rc.

[skevy]

@patscan if you go to http://localhost:8081/index.android.bundle?platform=android&dev=true in your browser...does it spit out JS? Or an error?

[patscan]

@skevy, here's the output:

{
  message: "TransformError: /Users/patscanlan/repos/AwesomeProject/index.android.js: Cannot read property 'error' of null",
  type: "TransformError",
  errors: [{ }]
}

[int64ago]

+1, I have the same problem

[int64ago]

@patscan Hi, I find it's the same issue as #5191 , it's the new bug of 0.18.0-rc

[skevy]

Closing this in favor of #5191 - please track there.