在react app中设置Babel生成的EcmaScript版本

回答 here ,

{
  "presets": [
    "react",
    ["env", {
      "targets": {
        "chrome": 67
      }
    }]
  ]
}

截至2018年7月,上述设置不支持 spread operator in objects . 为了实现它,

npm install --save-dev babel-plugin-transform-object-rest-spread

.babelrc :

{
  "presets": [
    "react",
    ["env", {
      "targets": {
        "chrome": 67
      }
    }]
  ],
  "plugins": ["transform-object-rest-spread"]
}