编译失败.找不到模块:无法解析“react-router-dom"(Failed to compile. Module not found: Can't resolve 'react-router-dom')：https://www.it1352.com/2365487.html
TypeScript与react结合一些注意点：https://zhuanlan.zhihu.com/p/88604372
React-Typescript之路由:https://zhuanlan.zhihu.com/p/79113863（yarn add react-router react-router-dom ＠types/react-router-dom
或使用:cnpm/npm install -D react-router react-router-dom ＠types/react-router-dom）
npm install @types/react-leaflet
npm install @types/esri-leaflet