babel.config.json

{
  "presets":[
     [
        "@babel/preset-env",
        {
           "useBuiltIns":"entry",
           "targets":{
              "ie":"11"
           }
        }
     ],
     "@babel/preset-react"
  ],
  "plugins":[
     "@babel/plugin-proposal-class-properties",
     "@babel/proposal-object-rest-spread"
  ]
}