Reactjs &引用；找不到声明文件"；Heroku上的react脚本ts应用程序

我有一个Heroku应用程序的React with Typescript前端，客户端存储在

client/

下，在我的顶级package.json中，我有以下内容：

...
"heroku-prebuild": "cd client && yarn && yarn run build",
...

在客户机文件夹中，我在

devDependencies

下有Typescript和相关依赖项，并且客户机构建（

react scripts ts build

）在本地运行良好。但是，在Heroku上，我在生成输出中得到以下错误：

/tmp/build_c4236577d559126ce645e4d8e04323f1/client/src/App.tsx
(3,37): Could not find a declaration file for module 'react-router-dom'. '/tmp/build_c4236577d559126ce645e4d8e04323f1/client/node_modules/react-router-dom/index.js' implicitly has an 'any' type.
Try `npm install @types/react-router-dom` if it exists or add a new declaration (.d.ts) file containing `declare module 'react-router-dom';`

然而，在我的客户的package.json中显然有

@types/react router dom

：

"devDependencies": {
  "@types/jest": "^23.3.10",
  "@types/node": "^10.12.12",
  "@types/react": "^16.7.13",
  "@types/react-dom": "^16.0.11",
  "@types/react-router-dom": "^4.3.1",
  "typescript": "^3.2.2",
  "tslint": "^5.11.0"
}

问题只出现在Heroku身上。我怎样才能解决这个问题