React-native: Module RCTLog is not a registered callable module when set dev mode to false on 0.29.0

[Fanghao]

encounter this red box error on iOS if set dev to false in AppDelegate.m of UIExplorer sample project.

env: React Native 0.29.0 + iphone 6 (9.3) simulator and device.

[ios122]

I solve this tmp. in index.ios.js, add

var RCTLog = require('RCTLog');

[pavlelekic]

+1

[getnashty]

+1

[abdallahm]

+1

[echocsg]

+1

[glassysky]

+1

[ytqiu]

same error to me. finally i found i had build my app in Debug mode working with --dev false react native bundle.
the following code tells us all the things:
`

• (void)logMessage:(NSString *)message level:(NSString *)level
  {
  if (RCT_DEBUG && [_javaScriptExecutor isValid]) {
  [self enqueueJSCall:@"RCTLog.logIfNoNativeHook"
  args:@[level, message]];
  }
  }
  `

[Amurmurmur]

I added: var RCTLog = require('RCTLog');

And with --dev false, I get the following, been struggling for couple of days now I hope you can help guys :/

React-Native v0.31
"react-native-router-flux": "^3.34.0"
"react-native-scrollable-tab-view": "^0.5.3"

[zccan]

+1

[alloy]

This happens when:

• passing the --dev false option to the packager, which seems to exclude the RCTLog module
• and building/running an app with the Xcode Debug configuration, which (by default) defines the DEBUG macro
• this in turn enables the RCT_DEBUG macro
• which finally leads to RN expecting the RCTLog module to be available

Seeing as all of this happens at compile time _and_ it’s a bit of an edge-case I’m not sure if there’s a simple/good way to detect this in the codebase.

I suggest that, if you do in fact want to test code that is packaged with --dev false, you build your app with the Release configuration instead. From Xcode, hold down the alt key while clicking the run button and select the Release configuration (remember to set it back afterwards).

@ide @javache Any other thoughts?

[ide]

I think we should make it so that you can test dev JS with Debug native code. It's a pretty reasonable thing to want to do, especially if you encounter bugs that are only in dev JS and want to debug from the native side.

[alloy]

@ide by dev JS, did you mean production JS ? Otherwise I’m confused. But if so, yeah it does make sense to be able to do that.

[ide]

Sorry, yes, I meant production / dev=false JS.

[javache]

If this is really a common issue, we should revert https://github.com/facebook/react-native/commit/5db4aad347ad8aec754e227e9afd3f5b4922c120 and always provide RCTLog.

cc @lexs

[alloy]

Yeah I think it's common enough to warrant that and the RCTLog source seems small enough.

[javache]

Reverted: https://github.com/facebook/react-native/commit/4b8688926b93a5b41f191cdba78f0f4335a62111

[luyuan11233]

Yeah~I have the same question,and i add "let RCTLog = require('RCTLog')" in the code,hope to solve this issue.

[jSkrills]

Hello All,

I still seem to be seeing this issue "Module RCTLog is not a registered callable module" message.

I attempted to reach out with expo here: https://github.com/expo/expo/issues/3 but I haven't gotten any feedback yet so I am echoing myself here in search of assistance because it seems very closely related.

I have tried to add this "var RCTLog = require('RCTLog');" into the index.ios.js file.

My problem/confusion with that is is that I initially started with expo and then detached to expokit and no longer have the index.ios.js file to my knowledge. And when I try to throw it into App.js , which is what I believe to be the equivalent, I get an error telling me that it should be listed in the project's dependencies. However, I don't think thats what needs done bc it's not something I can get from npm, I don't think.

Other related details: I just detached to expokit to try and implement some firebase dynamic link functionality. I have tried the suggestion of building from debug mode in Xcode with development turned on and off (for the packager) with no success and I have tried building from release mode in Xcode with development turned on and off (for the packager) with no success. I am attempting to use the following versions of things:

Xcode Version 9.2 (9C40b)

"expo": "22.0.0",
"react": "16.0.0-alpha.12",
"react-native": "https://github.com/expo/react-native/archive/sdk-22.0.0.tar.gz",
(though I have tried 16.0.0-beta.5 per the expo version matching docs also, with the same results)

I have been following the developing with expokit documentation to a T, in my mind, but as I mentioned above when I try to run the xworkspace file in xcode I see a screen saying "There was a problem running the app with the RCTLog is not a registered callable module" message at the bottom and filling up the output window in Xcode.

I would much appreciate anyone to point out the errors in my thinking or assumptions that I have made. Any possible alternative things to try doing to get me past this point would also be appreciated. I really would just like to be able to build and deploy successfully from Xcode.

Don't hesitate to ask me to shed light on any areas that I have been unclear about or ask for additional information about my scenario. Any time of day or night would be fine I am very anxious to get beyond this, I will respond back as soon as possible.