React Native: Encounter Unexpected Token Transform Error (

Yesterday, I successfully followed the instructions on React Native's Android Setup Page and ran the code without any issues. However, today when I attempted to run the same code, it displayed a "build is successful" message but only showed a 

android/build/intermediates/dex-cache/cache.xml
file in the android/builid folder. Additionally, I encountered an error similar to the one shown in this image. Here is the output from the terminal:

ugur@ugur-Lenovo-ideapad-510-15IKB:~/Desktop/tutorials/react native tutorial/NewPro$ react-native run-android
Scanning 559 folders for symlinks in /home/ugur/Desktop/tutorials/react native tutorial/NewPro/node_modules (2ms)
Starting JS server...
Building and installing the app on the device (cd android && ./gradlew installDebug)...
Incremental java compilation is an incubating feature.
(remaining content remains unchanged)
Starting the app on 4100fef8e47db1b3 (/home/ugur/Android/Sdk/platform-tools/adb -s 4100fef8e47db1b3 shell am start -n com.newpro/com.newpro.MainActivity)...
Starting: Intent { cmp=com.newpro/.MainActivity }

I am using Elementary OS with Node v6.11.2 and react-native-cli v2.0.1.

If anyone could help me identify the issue with my build, I would greatly appreciate it.

reactjsreact-nativenativebabeljs

Answer №1

If you are encountering issues with modules related to babel-preset-react-native, consider the following steps:

yarn remove babel-preset-react-native
yarn add <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="f2909390979edf828097819786df8097939186df9c93869b">[email protected]</a>

Alternatively, for NPM users:

npm uninstall babel-preset-react-native
npm install <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="9cfefdfef9f0b1eceef9eff9e8b1eef9fdffe8b1f2fde8f5ebfdfcc1d4dbc4ccd7">[email protected]</a>

Answer №2

Referenced the solution in this thread:

Implemented the suggested workaround successfully.

Solution Steps:

"dependencies": {
"react": "16.0.0-alpha.12",
"react-native": "0.47.1",
"babel-preset-react-native": "2.1.0"
},

After updating babel-preset-react-native to version 2.1.0, execute the following commands:

rm -rf node_module
npm cache clean
npm i

Lastly, restart the corresponding Android or iOS environment for the changes to take effect.

Answer №3

Remove the node_modules folder, and then execute the following command.

 npm install

After that, start the project.

Answer №4

Attempt to stop any process running on port 8081

If using a MAC, execute the following command:

sudo lsof -n -i4TCP:8081

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