element-ui .babelrc

{
  "presets": [
    ["env", {
      "modules": false,
      "targets": {
        "browsers": ["> 1%", "last 2 versions", "not ie <= 8"]
      }
    }],
    "stage-2"
  ],
  "plugins": ["transform-vue-jsx", "transform-runtime",[
    "component",
    {
      "libraryName": "element-ui",
      "styleLibraryName": "theme-chalk"
    }
  ]]
}