vue-cli打包后的代碼仍然存在es6寫法，ie打不開

如題，項目打包后頁面在ie打不開，不壓縮代碼打包后再看可以看到代碼里還有l(wèi)et這種寫法，babel沒有轉(zhuǎn)換是為什么。。.babelrc代碼如下

{
  "presets": [
    ["env", {
      "modules": false,
      "targets": {
        "browsers": ["> 1%", "last 2 versions", "not ie <= 8"]
      }
    }],
    "stage-2",
    ["es2015"]
  ],
  "plugins": [
    "transform-vue-jsx",
    "transform-runtime",
    ["syntax-dynamic-import"],
    ["component", [
      {
        "libraryName": "element-ui",
        "styleLibraryName": "~theme"
      }
    ]]

  ],
  "env": {
    "test": {
      "presets": ["env", "stage-2"],
      "plugins": ["transform-vue-jsx", "transform-es2015-modules-commonjs", "dynamic-import-node"]
    }
  }
}