Unhandled JS Exception: Unexpected token Expected a ')' or a ' after a parameter declaration.

[trabk1992]

Description

after delete file yarn.lock and yarn install
then build app , that error occur

Version

0.60.6

Output of npx react-native info

info Fetching system and libraries information...
System:
OS: macOS 11.6
CPU: (6) x64 Intel(R) Core(TM) i5-8500B CPU @ 3.00GHz
Memory: 218.86 MB / 20.00 GB
Shell: 5.8 - /bin/zsh
Binaries:
Node: 16.3.0 - /usr/local/bin/node
Yarn: 1.22.17 - ~/Documents/RabilooWorkSpace/yakuodo_app_mobile/node_modules/.bin/yarn
npm: 7.15.1 - /usr/local/bin/npm
SDKs:
iOS SDK:
Platforms: DriverKit 21.2, iOS 15.2, macOS 12.1, tvOS 15.2, watchOS 8.3
IDEs:
Android Studio: 4.2 AI-202.7660.26.42.7351085
Xcode: 13.2.1/13C100 - /usr/bin/xcodebuild
npmPackages:
react: 16.8.6 => 16.8.6
react-native: 0.60.6 => 0.60.6

Steps to reproduce

step 1: delete file yarn.lock and Podfile.lock
step 2: run 'yarn install'
step 3: run 'cd ios and Pod install'
step 4: build app
after show splash screen , app show error

Snack, code example, screenshot, or link to a repository

No response

[Satur-nity]

Facing the same error in react-native 0.61.5.

can anyone help?

[soleilpqd]

I'm working on project with RN 0.61.5 too.
Monday, I finished my task and did git commit at end of the day.
Yesterday, I added a dependency into package.json and did npm install, then got this error.
I tried git checkout to restore everything back to monday, delete lock file, node_modules, ~/npm. Nothing could help resolve the error.
I got same error on other (unmodified) projects using RN 0.61.5.
Lost 2 days and my work is still same as monday :(

[fabio-jreis]

Same error here 😩

react-native-cli: 2.0.1
react-native: 0.61.5

[LavanyaMacha2412]

Facing the same issue on RN 0.61.5

[joshua-davis-rose]

Same issue here with RN 0.63.4. Was working fine yesterday.

[JoseLuizJunior]

It's an error in react-native class -> node_modules/react-native/Libraries/Blob/URL.js

For some reason inside the class they are having to type as variables in a .js file
If you remove everything like typing, it works again.

Example:
To alter
append(key: string, value: string) -> append(key, value)

[joshua-davis-rose]

FWIW, the issue doesn't appear to be happening in RN 0.66.x

[joshua-davis-rose]

It's an error in react-native class -> node_modules/react-native/Libraries/Blob/URL.js

For some reason inside the class they are having to type as variables in a .js file If you remove everything like typing, it works again.

Example: To alter append(key: string, value: string) -> append(key, value)

For 0.63.x at least, that file hasn't changed in almost 2 years so it shouldn't suddenly be breaking now. There must be another dependency that has changed recently that is causing this error.

[fabio-jreis]

It's an error in react-native class -> node_modules/react-native/Libraries/Blob/URL.js

For some reason inside the class they are having to type as variables in a .js file If you remove everything like typing, it works again.

Example: To alter append(key: string, value: string) -> append(key, value)

doesn't work for me 😭

[joshua-davis-rose]

This appears related to babel, not react-native. I believe the issue is "@babel/traverse" 7.16.8: babel/babel#14139

[joshua-davis-rose]

I finally got it to work by setting explicit versions in my devDependencies and resolutions. I also needed to delete my node_modules and yarn.lock, but YMMV. I went back to 7.16.5 since it was the upgrade to 7.16.7 that I first saw the issue, but the latter may be safe.

"devDependencies": {
    "@babel/core": "7.16.5",
    "@babel/preset-flow": "7.16.5",
    "@babel/runtime": "7.16.5"
}
"resolutions": {
    "@babel/traverse": "7.16.5"
}

[qcmoke]

Facing the same issue on RN 0.62.2

[quyle1222]

I finally got it to work by setting explicit versions in my devDependencies and resolutions. I also needed to delete my node_modules and yarn.lock, but YMMV. I went back to 7.16.5 since it was the upgrade to 7.16.7 that I first saw the issue, but the latter may be safe.

"devDependencies": {
    "@babel/core": "7.16.5",
    "@babel/preset-flow": "7.16.5",
    "@babel/runtime": "7.16.5"
}
"resolutions": {
    "@babel/traverse": "7.16.5"
}

Don't work for me @@
I try delete node_modules and npm install ,after, cd android and run ./gradlew clean => run success android

[trabk1992]

now, i found solution to fix this issue .
my solution :
"devDependencies": {
"@babel/core": "7.16.5",
"@babel/preset-flow": "7.16.5",
"@babel/runtime": "7.16.5",
"@babel/traverse": "7.16.5"
}

[qianqiang2017]

Facing the same issue on RN 0.59.9

[kerm1it]

babel/babel#14139 (comment)

[Satur-nity]

babel/babel#14139 (comment)

it works for me.

Thanks

[kurashiva11]

same error with
RN: 0.62.2
"@babel/core": "7.16.5",
"@babel/runtime": "7.16.5",
"@babel/traverse": "7.16.5",
"@babel/preset-flow": "7.16.5",
"babel-jest": "24.9.0",
"metro-react-native-babel-preset": "0.59.0"

I have uninstalled node_modules, cleaned Gradle build, re-installed everything and started the app. but still, it is showing the same error.

[kerm1it]

same error with RN: 0.62.2 "@babel/core": "7.16.5", "@babel/runtime": "7.16.5", "@babel/traverse": "7.16.5", "@babel/preset-flow": "7.16.5", "babel-jest": "24.9.0", "metro-react-native-babel-preset": "0.59.0"

I have uninstalled node_modules, cleaned Gradle build, re-installed everything and started the app. but still, it is showing the same error.

try yarn start --reset-cache to start app，maybe the error build cache is exist.

[fabio-jreis]

babel/babel#14139 (comment)

works here!

[nicolo-ribaudo]

If the solution in the Babel repository doen't work for someone, we will need a repository that we can use to reproduce the bug.

[milkcask]

Drop-in replacement metro-react-native-babel-preset, and running npx react-native start --reset-cache work for me.

[Hello-Alex-Cheng]

change your babel.config.js file

presets: [[
    'module:metro-react-native-babel-preset',
    {
      unstable_disableES6Transforms: true
    }
]],

[ahmedelsayed11]

Monday

What to make in that file ?

[SyedSaifAli]

change your babel.config.js file

presets: [[
    'module:metro-react-native-babel-preset',
    {
      unstable_disableES6Transforms: true
    }
]],

Not working with this change as well.

[HeyShinner]

babel/babel#14139 (comment)

It works!!

[bsdaoquang]

It's an error in react-native class -> node_modules/react-native/Libraries/Blob/URL.js

For some reason inside the class they are having to type as variables in a .js file If you remove everything like typing, it works again.

Example: To alter append(key: string, value: string) -> append(key, value)

Thank you so much, it fixed this error

[kelokchan]

I can confirm after bumping metro-react-native-babel-preset to 0.59.0 and running npx react-native start --reset-cache everything works again

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[github-actions]

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