解决 :'import' and 'export' may appear only with 'sourceType: module'

yarn add babel-preset-stage-0 -D
yarn add babel-preset-env -D
然后在根目录的.babelrc中加入

 "presets": [
     "env",
     "react",
     "stage-0"
 ],

即可。保证env和stage-0存在,env囊括了es2015,2016,2017,现在也是官方推荐的写法。

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转载自blog.csdn.net/run_youngman/article/details/80747695