This is my babel file
My code:
import React, { useRef, useState } from 'react'
import { View, useWindowDimensions, Button } from 'react-native'
import Animated, { runOnUI } from 'react-native-reanimated';
export default function Login() {
const { width, height } = useWindowDimensions();
// const value = useSharedValue(0);
function someWorklet(greeting: any) {
'worklet';
console.log("Hey I'm running on the UI thread");
}
return (
<View style={{ flex: 1, justifyContent: 'flex-end', alignItems: 'center' }}>
<Button title="click me" onPress={() => runOnUI(someWorklet)('Howdy')} />
</View>
);
}
The package I installed is "react-native-reanimated": "^2.1.0"
I followed their installation process: React Native Reanimated instalation guide.
The error is:
Reanimated 2 failed to create a worklet, maybe you forgot to add Reanimated's babel plugin?
I have found this issue on this link.
These are the steps that I have followed for having my project up and running without any errors:
Run yarn add react-native-reanimated#next react-native-gesture-handler
I have added import 'react-native-gesture-handler' to App.tsx file at the top of the file before importing any packages
You should update the babel.config.js file and add react-native-reanimated/plugin to plugins
module.exports = {
presets: ["module:metro-react-native-babel-preset"],
plugins: [
"react-native-reanimated/plugin",
],
};
The last thing you should do is run your project by removing the cache yarn start --reset-cache
Here is what worked for me in an Expo project.
This is my babel.config.js.
Note that react-native-reanimated/plugin must be at the last plugin in the plugins array of the babel.config.js.
module.exports = function (api) {
api.cache(true);
return {
presets: ["babel-preset-expo"],
plugins: [
[
"module-resolver",
{
extensions: [".tsx", ".ts", ".js", ".json"],
},
],
"react-native-reanimated/plugin",
],
};
};
Make sure you add react-native-reanimated/plugin as the last element of the plugins
Then stop the expo-server and run the following command:
expo r -c
It's all done.
Clearing the cache worked for me, run:
npx react-native start --reset-cache
If you are using Expo try to start your app with expo r -c in order to clear caches associated with your project.
Just add the below code in babel.config.js
module.exports = {
presets: ['module:metro-react-native-babel-preset'],
// add the below line
plugins: ['react-native-reanimated/plugin'],
// this should be always last line
};
then if you need to clear the package manager cache and start it clean if you are using
yarn
yarn start --reset-cache
npx
npx react-native start --reset-cache
and it worked for me
I faced the same issue. The following command solved the issue:
npm install react-native-reanimated#~2.2.0
I also came around this problem while implementing the reanimated 2 package. For me it seems a half configured installation issue. I am using React Native CLI and Windows Machine.
This is what worked for me :
Delete the node_modules folder and run this just to be sure.
npx react-native start --reset-cache
Run
npm install
In babel.cofig.js add these lines. the Reanimated plugin has to be the last item in the plugins array.
//babel.config.js
module.exports = {
...
plugins: [
...
'react-native-reanimated/plugin', // << add
],
};
Turn on Hermes engine by editing android/app/build.gradle
project.ext.react = [
enableHermes: true
]
5.Plug Reanimated in MainApplication.java. This file is present in android/app/src/main/java/com/appname folder.
import com.facebook.react.bridge.JSIModulePackage; // << add
import com.swmansion.reanimated.ReanimatedJSIModulePackage; // << add
...
private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
...
#Override
protected String getJSMainModuleName() {
return "index";
}
**#Override //<<add this function
protected JSIModulePackage getJSIModulePackage() {
return new ReanimatedJSIModulePackage();
}**
};
This is actually availaible in there installation docs.
https://docs.swmansion.com/react-native-reanimated/docs/fundamentals/installation
I just add react-native-reanimated/plugin to babel.config.json in plugins array
module.exports = {
presets: [some thing],
plugins: [
"react-native-reanimated/plugin",
],
};
and after that expo start -c
and error solved no need do extra steps
Just adding "plugins: ['react-native-reanimated/plugin']", in my babel.config did the trick for me.
My babel.config.js file look like this now.
module.exports = {
presets: ['module:metro-react-native-babel-preset'],
plugins: ['react-native-reanimated/plugin'],
};
then I fully cleaned my RN project by running these:
watchman watch-del-all
rm -rf yarn.lock package-lock.json node_modules
rm -rf android/app/build
rm ios/Pods ios/Podfile.lock
rm -rf ~/Library/Developer/Xcode/DerivedData
npm install && cd ios && pod update && cd ..
npm start -- --reset-cache
You should run one by one or one line command.
watchman watch-del-all && rm -rf yarn.lock package-lock.json node_modules && rm -rf android/app/build && rm ios/Pods ios/Podfile.lock && rm -rf ~/Library/Developer/Xcode/DerivedData && npm install && cd ios && pod update && cd ..
Hope this help to someone.
Delete node_modules and reinstall, and make sure to delete all caches and all previous settings -- RN caches, packager caches, simulator caches and settings, etc. It might even help to go to a previous version of your app when you hadn't tried to install version 2 at all.
I am using expo and following all these steps was helpful :- https://forums.expo.io/t/how-to-clear-the-expo-and-react-native-packager-caches-metro-watchman-haste/1352
Add this code in babel.config.js
module.exports = {
presets: ['module:metro-react-native-babel-preset'],
env: {
production: {
plugins: [
],
},
},
plugins: [
[
'module-resolver',
{
extensions: ['.tsx', '.ts', '.js', '.json'],
},
],
'react-native-reanimated/plugin'
]
};
and then rebuild your application or run yarn start --reset-cache
follow these steps
expo install react-native-reanimated
After the installation completed, add the Babel plugin to babel.config.js:
api.cache(true);
return {
presets: ['babel-preset-expo'],
plugins: ['react-native-reanimated/plugin'],
};
};
expo start --clear
In my condition i will change my babel.config.js to different this
module.exports = function (api) {
api.cache(true);
return {
presets: ["babel-preset-expo"],
plugins: [
[
"module-resolver",
{
extensions: [".tsx", ".ts", ".js", ".json"],
},
],
"react-native-reanimated/plugin",
],
};
};
Don't Forget to type this command on your project directory
expo r -c
After you add the Babel plugin, restart your development server and clear the bundler cache: expo start --clear.
Note: If you load other Babel plugins, the Reanimated plugin has to be the last item in the plugins array.
I tried this on a freshly created expo project (tabs template). It generated the following default babel.config.js:
module.exports = function(api) {
api.cache(true);
return {
presets: ['babel-preset-expo']
};
};
I added just one line, like this:
module.exports = function(api) {
api.cache(true);
return {
presets: ['babel-preset-expo'],
plugins: ['react-native-reanimated/plugin']
};
};
and cleared the rebuild cache (yarn start -c).
This worked for me.
Sometimes you have done all setups but you are getting errors then just type this cmd:
npx react-native start --reset-cache
It will be helpful.
I had the same issue yesterday and when I did a Google search I landed here. After some digging here is what I understood:
Reanimated v2's latest version does not run in Expo when in debug mode. So I tried to open the developer options to turn off debugging by shaking the device but I was not able to.
Then I found that you can toggle to production mode once the Metro Bundler server connection is established. Once you toggle to production mode in Expo, the app works.
Enabling Production mode in Expo
You can try
yarn add react-native-reanimated#next
npx react-native start --reset-cache
Add Reanimated's babel plugin to your babel.config.js.
module.exports = {
presets: [
'module:metro-react-native-babel-preset',
'#babel/preset-typescript'
],
plugins: ['react-native-reanimated/plugin'],
};
It's worked for me. My babel.config was:
module.exports = {
presets: ['module:metro-react-native-babel-preset'],
env: {
production: {
plugins: [
'react-native-paper/babel',
'react-native-reanimated/plugin',
],
},
},
};
I changed to this:
module.exports = {
presets: ['module:metro-react-native-babel-preset'],
plugins: [
'react-native-paper/babel',
'react-native-reanimated/plugin',
]
};
And did all the instructions at https://docs.swmansion.com/react-native-reanimated/docs/fundamentals/installation
If you are using expo, what worked for me is
expo doctor --fix-dependencies
install expo
expo install react-native-reanimated
add babel.config.js
plugins: ['react-native-reanimated/plugin']
start server
expo start --clear
I had to upgrade from 2.8.0 to 2.9.1 (the latest stable version). Also 3.0.0-rc worked too.
You can see the latest versions on the Versions tab here.
Change it in your package.json file:
"react-native-reanimated": "2.9.1",
And run yarn again to download the package.
We had a .babelrc and babel.config.json and only the config had our reanimated plugin so I consolidated them but that didn't fix the issue.
For "react-native-reanimated": "~2.12.0"
Step 1:
Add import 'react-native-gesture-handler' to App.ts file at the top of the file before importing any packages
Step 2:
Go to the babel.config.js and add plugins array:-
module.exports = function (api) {
api.cache(true);
return { '
presets: ["babel-preset-expo"],
plugins: ["react-native-reanimated/plugin"//must be in the end of plugins array],
};
};
Step 3:
Run npx expo -c
Resources:
*1.*https://reactnavigation.org/docs/drawer-navigator
2-https://www.reanimated2.com/docs/fundamentals/installation
3-https://stackoverflow.com/questions/67130651/reanimated-2-failed-to-create-a-worklet-maybe-you-forgot-to-add-reanimateds-ba/68694681#68694681
Running grunt - I get this error message:
Running "sass:all" (sass) task
Fatal error: The implementation option must be passed to the Sass task
I've tried re-installing grunt, node, npm, dependencies - but I always come back to this error I can't get past.
Should I post my Gruntfile.js? Frankly, this was set up by a third-party and we don't use it often - I'm thinking maybe we should start from the ground up because it is from about 4 years ago originally... but wondering if anyone has seen this error before and knows of a fix/workaround.
With the update to grunt-sass 3, you have to choose whether you want to use node-sass or dart-sass to compile
For node-sass you need to install the module with:
$ npm install --save-dev node-sass
In you gruntfile, you than need to add node-sass as requirement and add the define constant as implementation option:
const sass = require('node-sass');
require('load-grunt-tasks')(grunt);
grunt.initConfig({
sass: {
options: {
implementation: sass,
sourceMap: true
},
dist: {
files: {
'main.css': 'main.scss'
}
}
}
});
See also official page for more details: https://www.npmjs.com/package/grunt-sass
use this
**const sass = require("node-sass");**
**grunt.initConfig({
sass: {
options: {
implementation: sass,
sourceMap: true,
},
dist: {
files: {
"css/styles.css": "css/styles.css",
},
},
},
});
This will help you solve the problem
UPDATE: Only works for grunt-sass 2.x
I had this problem when upgrading from grunt-sass 1.x to 2.x. This solved it for me:
Add implementation: 'sass' to your sass.options object in Gruntfile.js like so:
options: {
implementation: 'sass',
outputStyle: 'expanded',
sourceMap: true,
quiet: true // stop depreciation errors
},
I tried to use await/async on react native,but I got unexpected token error.
I added the code blow in my javascript source file:
var value = await AsyncStorage.getItem('STORAGE_KEY');
My react native version is 0.15.0.
Do I need to add some configuration to use async/await?
I'm using async/await in my react native app and didn't have to do anything to configure or enable it in my project. My usage takes the form of...
async getCache(key){
try{
let value = await AsyncStorage.getItem(key);
return value.json();
}
catch(e){
console.log('caught error', e);
// Handle exceptions
}
}
Note:
If you use an await inside a function that is not explicitly declared with async, you'll end up with an Unexpected token syntax error.
Do I need to add some configuration to use async/await?
Yes. async is still not a finalized part of the specification; they're currently considered "Stage 3" (Candidate).
You can enable all Stage 3 language proposals in your .babelrc by using the stage-3 preset. Alternatively, you can add just the async plugin.
If you have a .babelrc file in the root of your project, you need to add the "react-native" preset:
npm i babel-preset-react-native --save-dev
Then in your .babelrc file add the following:
{
"presets": ["react-native"]
}
More information here.
After reading this comment on the react-native GitHub issues, the following worked for me:
Add the following npm module:
npm install babel-preset-react-native-stage-0 --save
Add the following configuration to your .babelrc file:
{ presets: ['react-native-stage-0'] }
Clear your cache:
$ watchman watch-del-all
$ ./node_modules/react-native/packager/packager.sh --reset-cache