You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file."

I'm setting up webpack to my react project using yarn and this error appears:

ERROR in ./src/app.js 67:6 Module parse failed: Unexpected token (67:6) You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. See https://webpack.js.org/concepts#loaders ℹ ｢wdm｣: Failed to compile.

webpack.config.js

const path = require("path");

module.exports = {
    entry: "./src/app.js",
    output: {
        path: path.join(__dirname, 'public'),
        filename: 'bundle.js'
    },
    module:{
        rules:[{
            loader: 'babel-loader',
            test: '/\.(js|jsx)$/',
            exclude: /node_modules/
        }]
    },
    devtool: 'cheap-module-eval-source-map',
    devServer: {
        contentBase: path.join(__dirname, 'public')
    }
}

.babelrc
{
    "presets": ["env", "react","@babel/preset-env"],
    "plugins": [
        "transform-class-properties"
    ]
}

package.json

{
  "name": "react",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "scripts": {
    "serve": "live-server public/",
    "build": "webpack",
    "dev-server": "webpack-dev-server"
  },
  "dependencies": {
    "babel-cli": "6.24.1",
    "babel-core": "6.25.0",
    "babel-plugin-transform-class-properties": "6.24.1",
    "babel-preset-env": "1.5.2",
    "babel-preset-react": "6.24.1",
    "live-server": "^1.2.1",
    "react": "^16.9.0",
    "react-dom": "^16.9.0",
    "webpack": "^4.39.3",
    "webpack-dev-server": "^3.8.0"
  },
  "devDependencies": {
    "@babel/core": "^7.6.0",
    "babel-loader": "^8.0.6",
    "webpack-cli": "^3.3.8"
  }
}