package.json

{
  "name": "jest_test",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "watch": "webpack --watch ",
    "test": "jest --watch",
    "serve": "webpack-dev-server --hot --inline"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "jest": {
    "testRegex": "test.bundle\\.js$"
  },
  "dependencies": {
    "react": "15.5.4",
    "react-dom": "15.5.4",
    "mobx": "3.1.9",
    "mobx-react": "4.1.8",
    "react-router": "4.1.1",
    "react-router-dom": "4.1.1",
    "normalize-css": "2.3.1"
  },
  "devDependencies": {
    "@types/jest": "19.2.3",
    "@types/react": "15.0.24",
    "@types/react-dom": "15.5.0",
    "@types/react-router-dom": "4.0.4",
    "ts-loader": "2.0.3",
    "typescript": "2.3.2",
    "webpack": "2.5.1",
    "webpack-cli": "1.3.1",
    "webpack-dev-server": "2.4.5",
    "style-loader": "0.17.0",
    "css-loader": "0.28.1"
  }
}

tsconfig.json

{
  "compilerOptions": {
    "outDir": "./dist/",
    "sourceMap": true,
    "noImplicitAny": true,
    "module": "commonjs",
    "target": "es5",
    "jsx": "react",
    "allowJs": true,
    "experimentalDecorators": true
  }
  
}

webpack.config.js

var path = require('path');

module.exports = {
  entry: {
      "app": './src/index.tsx',
      "test": './src/index.test.tsx'
  },
  output: {
    filename: './dist/[name].bundle.js',
    path: __dirname
  },
  module: {
    rules: [
      {
        test: /\.tsx?$/,
        loader: 'ts-loader',
        exclude: /node_modules/,
      },
      {
        test: /\.css$/,
        loader: [
          'style-loader',
          'css-loader'
        ]
      }
    ]
  },
  resolve: {
    modules: [__dirname, 'node_modules'],
    extensions: [".tsx", ".ts", ".js"]
  }
};