.babelrc

{
  "env": {
    // node端配置
    "node":{
      "presets": [
        [
          "@babel/preset-env",
          {
            "targets":{
              "node":"current"
            }
          }
        ],
        "@babel/preset-react"
      ],
      "plugins": [
        "@babel/plugin-proposal-class-properties"
      ]
    },
    // 客户端配置
    "client": {
      "presets": [
        [
          "@babel/preset-env",
          {
            "targets": {
              "browsers": [
                ">1%",
                "last 2 versions",
                "not ie <= 8"
              ]
            }
          }
        ],
        "@babel/preset-react"
      ],
      "plugins": [
        "@babel/plugin-proposal-class-properties",
        "@babel/plugin-transform-runtime",
        "react-hot-loader/babel"
      ]
    }
  }
}