纱线运行开始工作和npm运行开始不返回任何内容

Question

为什么$yarn run start起作用而$npm run start什么也不起作用？ $ npm -v 6.13。

这是我的package.json

{
  "name": "my project",
  "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": "^16.12.0",
    "react-dom": "^16.12.0",
    "react-redux": "^7.1.3",
    "react-scripts": "^3.3.0",
    "redux": "^4.0.4",
    "typescript": "^3.7.3"
  },
  "scripts": {
    "start": "./node_modules/react-scripts/bin/react-scripts.js start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "proxy": "http://localhost:3001/",
  "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"
    ]
  }
}

我需要$npm run start才能执行。它绝对不会返回任何内容，甚至不会发出警告，就好像它无法解析package.json文件一样。