$ cd プロジェクトのフォルダ
$ npx create-react-app ./ --template typescript

Ok to proceed? (y) 

We suggest that you begin by typing:

  cd プロジェクトフォルダ
  npm start

Happy hacking!

import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';

ReactDOM.render(
  <React.StrictMode>
    <App />
  </React.StrictMode>,
  document.getElementById('root')
);

import React, { FC } from 'react';

interface AppProps{}
const App :FC<AppProps> = ()=>{
  return (
    <div>
    flowchart builder !
  </div>
  ) ;
};

export default App;

{
  "compilerOptions": {
    "target": "es5",
    "lib": [
      "dom",
      "dom.iterable",
      "esnext"
    ],
    "allowJs": true,
    "skipLibCheck": true,
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "strict": true,
    "forceConsistentCasingInFileNames": true,
    "noFallthroughCasesInSwitch": true,
    "module": "esnext",
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": true,
    "jsx": "react-jsx",
  },
  "include": [
    "src"
  ]
}

$ npm start