package.json

dependencies に @material-ui/core を追加する

{
  "name": "example",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@testing-library/jest-dom": "^4.2.4",
    "@testing-library/react": "^9.3.2",
    "@testing-library/user-event": "^7.1.2",
    "react": "^16.13.0",
    "react-dom": "^16.13.0",
+    "@material-ui/core": "latest",
    "react-scripts": "3.4.0"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  }
}

App.js

ぐるぐるを三個置いてみる

import React from 'react';

import CircularProgress from '@material-ui/core/CircularProgress'

function App() {
  return (
    <div>
      <CircularProgress />
      <CircularProgress />
      <CircularProgress />
    </div>
  );
}

export default App;

画面例

yarn install
yarn start

して動作確認する

Original by Github issue

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