Create a React project from scratch, with TypeScript and Webpack

Create the project's folder:

mkdir react-app
cd react-app

Generate a default package.json file with yarn:

yarn init -y

Install React, TypeScript and Webpack:

yarn add react react-dom

yarn add --dev @types/react \
        @types/react-dom \
        ts-loader \
        css-loader \
        html-webpack-plugin \
        sass \
        sass-loader \
        style-loader \
        typescript \
        webpack \
        webpack-cli \
        webpack-dev-server

Add build, dev & clean scripts in the package.json file:

 react-app/package.json
 ....
  },
  "scripts": {
    "clean": "rm -rf dist/*",
    "build": "webpack",
    "dev": "webpack serve"
  }

Configure TypeScript by creating the file tsconfig.json with:

 react-app/tsconfig.json
{
  "compilerOptions": {
    "incremental": true,
    "target": "es5",
    "module": "commonjs",
    "lib": ["dom", "dom.iterable", "es6"],
    "allowJs": true,
    "jsx": "react",
    "sourceMap": true,
    "outDir": "./dist/",
    "rootDir": ".",
    "removeComments": true,
    "strict": true,
    "moduleResolution": "node",            
    "allowSyntheticDefaultImports": true,
    "esModuleInterop": true,
    "experimentalDecorators": true
  },
  "include": [
    "./client"
  ],
  "exclude": [
    "./node_modules",
    "./build",
    "./dist"
  ]
}

To configure Webpack, make a file webpack.config.js containing:

 react-app/webpack.config.js
const path = require("path");

const app_dir = __dirname + '/client';

const HtmlWebpackPlugin = require('html-webpack-plugin');
const HTMLWebpackPluginConfig = new HtmlWebpackPlugin({
  template: app_dir + '/index.html',
  filename: 'index.html',
  inject: 'body'
});

const config = {
  mode: 'development',
  entry: app_dir + '/app.tsx',
  output: {
    path: __dirname + '/dist',
    filename: 'app.js',
    publicPath: '/'
  },
  module: {
    rules: [{
        test: /\.s?css$/,
        use: [
          'style-loader',
          'css-loader',
          'sass-loader'
        ]
      }, {
        test: /\.tsx?$/,
        loader: "ts-loader",
        exclude: /(node_modules|bower_components)/
      },
      {
        test: /\.(woff|woff2|ttf|eot)(\?v=[0-9]\.[0-9]\.[0-9])?$/,
        exclude: [/node_modules/],
        loader: "file-loader"
      },
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        exclude: [/node_modules/],
        loader: "file-loader"
      },
      {
        test: /\.(pdf)$/i,
        exclude: [/node_modules/],
        loader: "file-loader",
        options: {
          name: '[name].[ext]',
        },
      },
    ]
  },
  plugins: [HTMLWebpackPluginConfig],
  resolve: {
    extensions: [".ts", ".tsx", ".js", ".jsx"]
  },
  optimization: {
    removeAvailableModules: false,
    removeEmptyChunks: false,
    splitChunks: false,
  },
  devServer: {
    port: 8080,
    hot: true,
    historyApiFallback: true,
  },
};
module.exports = config;

Create a folder named client (in the project's folder):

mkdir client
cd client

Make a simple React component, in the file numbers.tsx:

 react-app/client/numbers.tsx
import React, {useState} from 'react';

interface INumberProps {
  initValue: number
}

const Numbers = (props: INumberProps) => {
  const [value, setValue] = useState(props.initValue)

  const onIncrement = () => {
    setValue(value + 1)
  }

  const onDecrement = () => {
    setValue(value - 1)
  }

  return (
    <div>
      Number is {value}
        <div>
          <button onClick={onIncrement}>+</button>
          <button onClick={onDecrement}>-</button>
        </div>
    </div>
  )
}
export default Numbers

///
// The same component as a Class

// interface INumbersProps {
//   initValue: number
// }

// interface INumbersState {
//   value: number
// }

// export default class Numbers 
//   extends React.Component<INumbersProps, INumbersState> {

//   constructor(props: INumbersProps) {
//       super(props)
//      // this.state = { value: this.props.initValue };
//   }

//   componentWillMount = () => {
//       this.setState({
//           value: this.props.initValue
//       })
//   }

//   onIncrement = () => {
//       let newVal = this.state.value + 1
//       this.setState({
//           value: newVal
//       })
//   }

//   onDecrement = () => {
//       let newVal = this.state.value - 1
//       this.setState({
//           value: newVal
//       })
//   }

//   render = () => {
//       return (
//           <div>
//               Number is {this.state.value}
//               <div>
//                   <button onClick={this.onIncrement}>+</button>
//                   <button onClick={this.onDecrement}>-</button>
//               </div>
//           </div>
//       )
//   }
// }

Create the main React component (the entry point), in the file app.tsx:

 react-app/client/app.tsx
import * as React from 'react';
import * as ReactDOM from 'react-dom';
import Numbers from './numbers';

ReactDOM.render(
    <Numbers initValue={42} />,
    document.getElementById('app') as HTMLElement
  );

Next, add the index.html:

 react-app/client/index.html
<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>React TypeScript</title>
</head>

<body>
  <div id="app"></div>
</body>
</html>

You can save the Setup steps as a shell script:

#!/bin/sh

rm -rf node_modules
rm -rf dist
rm -rf build
rm package.json
rm yarn.lock

yarn init --yes

yarn add react react-dom

yarn add --dev @types/react \
        @types/react-dom \
        ts-loader \
        css-loader \
        html-webpack-plugin \
        sass \
        sass-loader \
        style-loader \
        typescript \
        webpack \
        webpack-cli \
        webpack-dev-server

# Remove the last line
sed -i.bak '$ d' package.json && rm package.json.bak

# append the scripts commads
cat <<EOT >> package.json
   ,"scripts": {
      "clean": "rm -rf dist/*",
      "build": "webpack",
      "dev": "webpack serve"
   }
}

Delete the node-modules folder and, when you want to start a new project, you can copy the contents of react-app to the new location:

mkdir new-project
cd new-project

# copy the react-app folder content to the new project
rsync -rtv /path/to/../react-app/ .

./init.sh