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 "devDependencies": 
 "@symfony/webpack-encore": "^0.20.1",
 "babel-jest": "^23.2.0",
 "babel-preset-env": "^1.7.0",
 "babel-preset-es2015": "^6.24.1",
 "babel-preset-react": "^6.24.1",
 "enzyme": "^3.3.0",
 "enzyme-adapter-react-16": "^1.1.1",
 "enzyme-to-json": "^3.3.4",
 "jest": "^23.2.0",
 "jest-enzyme": "^6.0.2",
 "webpack-notifier": "^1.6.0"
 ,
 "dependencies": 
 "axios": "^0.18.0",
 "babel-plugin-transform-object-rest-spread": "^6.26.0",
 "moment": "^2.22.2",
 "prop-types": "^15.6.2",
 "rc-datetime-picker": "^1.6.1",
 "react": "^16.4.1",
 "react-dom": "^16.4.1",
 "react-redux": "^5.0.7",
 "redux": "^4.0.0"
 ,
 "scripts": 
 "test": "jest",
 "test:watch": "jest --watch"
 ,
 "jest": 
 "transform": 
 "^.+\.js$": "babel-jest"
 ,
 "setupTestFrameworkScriptFile": "./assets/js/__tests__/setup/setupEnzyme.js",
 "testPathIgnorePatterns": [
 "./assets/js/__tests__/setup/"
 ]
 

var Encore = require('@symfony/webpack-encore');

Encore
// the project directory where all compiled assets will be stored
 .setOutputPath('public/build/')

 // the public path used by the web server to access the previous directory
 .setPublicPath('/build')

 // will create public/build/app.js and public/build/app.css
 .addEntry('app', './assets/js/index.js')

 // allow legacy applications to use $/jQuery as a global variable
 .autoProvidejQuery()

 // enable source maps during development
 .enableSourceMaps(!Encore.isProduction())

 // empty the outputPath dir before each build
 .cleanupOutputBeforeBuild()

 // show OS notifications when builds finish/fail
 .enableBuildNotifications()

 .enableReactPreset()

 // first, install any presets you want to use (e.g. yarn add babel-preset-es2017)
 // then, modify the default Babel configuration
 .configureBabel(function(babelConfig) 
 // add additional plugins
 babelConfig.plugins.push('transform-object-rest-spread');

 // no plugins are added by default, but you can add some
 // babelConfig.plugins.push('styled-jsx/babel');
 )

// create hashed filenames (e.g. app.abc123.css)
// .enableVersioning()

// allow sass/scss files to be processed
// .enableSassLoader()
;

// export the final configuration
module.exports = Encore.getWebpackConfig();

const Enzyme = require('enzyme');
// this is where we reference the adapter package we installed
// earlier
const EnzymeAdapter = require('enzyme-adapter-react-16');
// This sets up the adapter to be used by Enzyme
Enzyme.configure( adapter: new EnzymeAdapter() );