verdaccio/.babelrc

{
     "presets": [
          "react",
          ["env", {
               "targets": {
                    "browsers": "last 2 versions"
               },
               "loose": true,
               "modules": false
          }]
     ],
     "env": {
          "test": {
               "plugins": [
                    "transform-es2015-modules-commonjs"
               ]
          }
     }
}