heroku ./node_modules/bootstrap/dist/js/bootstrap.js 找不到模块：无法解析“popper.js”

问：

大家好，我是heroku的新手，

如果我从 github 存储库克隆并在计算机上运行 >npm install 和 >npm start，它可以正常工作，但在我的 heroku 应用程序上显示错误：

无法编译 ./node_modules/bootstrap/dist/js/bootstrap.js 模块 未找到：无法.js解析 '/app/node_modules/bootstrap/dist/js'

Heroku 应用程序：https://nfq-barber-shop.herokuapp.com/ Github 存储库：https://github.com/ezopas/nfq-barber-shop 我尝试运行以下命令：

npm install bootstrap -D
npm install jquery -D
npm install popper.js -D

但它仍然是同样的错误。我该怎么办？我的应用程序在其他计算机上运行完全正常（npm start）。

package.json：

{
  "name": "nfq-barber-shop-app",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "axios": "^0.18.0",
    "bootstrap": "^4.3.1",
    "font-awesome": "^4.7.0",
    "fullcalendar": "^3.10.0",
    "fullcalendar-reactwrapper-with-scheduler": "^1.1.0",
    "jquery.nicescroll": "^3.7.6",
    "moment": "^2.24.0",
    "nav-scroll-spy": "^1.0.2",
    "node-sass": "^4.11.0",
    "react": "^16.8.1",
    "react-dom": "^16.8.1",
    "react-router": "^4.3.1",
    "react-router-dom": "^4.3.1",
    "react-router-redux": "^4.0.8",
    "react-scripts": "2.1.5",
    "redux": "^4.0.1",
    "sweetalert": "^2.1.2"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": [
    ">0.2%",
    "not dead",
    "not ie <= 11",
    "not op_mini all"
  ],
  "devDependencies": {
    "jquery": "^3.3.1",
    "popper.js": "^1.14.7"
  }
}