Reanimated 2 failed to create a worklet, maybe you forgot to add Reanimated's babel plugin?

user_8954950 0
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This is my babel file

enter image description here

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?

react-native-reanimated-v2 react-native
22 Answers

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:

  1. Run yarn add react-native-reanimated@next react-native-gesture-handler
  2. I have added import 'react-native-gesture-handler' to App.tsx file at the top of the file before importing any packages
  3. 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",
  ],
};
  1. The last thing you should do is run your project by removing the cache yarn start --reset-cache
user_114497030

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.

user_129258310

Clearing the cache worked for me, run:

npx react-native start --reset-cache
user_142251690

If you are using Expo try to start your app with expo r -c in order to clear caches associated with your project.

user_157048770

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

user_39021210

I faced the same issue. The following command solved the issue:

npm install react-native-reanimated@~2.2.0
user_177210620

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 :

  1. Delete the node_modules folder and run this just to be sure.
npx react-native start --reset-cache
  1. Run
npm install
  1. 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
      ],
  };
  1. 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

user_172801730

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

user_130999640

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.

user_88447420
user_130007410

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

user_34626860

follow these steps

  1. expo install react-native-reanimated
  2. 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'],
  };
};
  1. expo start --clear
user_42972330

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
user_150635970

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.

user_152774100

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.

user_15614890

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.

user_187455460

I had the same issue yesterday and when I did a Google search I landed here. After some digging here is what I understood:

  1. 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.
  2. 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
user_78393310

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'],
};
user_146519520

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

user_134184810

If you are using expo, what worked for me is

expo doctor --fix-dependencies
user_60221580

  1. install expo
    expo install react-native-reanimated

  2. add babel.config.js
    plugins: ['react-native-reanimated/plugin']

  3. start server
    expo start --clear

user_168030690

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.

user_61362350
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