解决 using `babel-preset-react-app` requires that you specify `node_env` or `babel

using babel-preset-react-app requires that you specify node_env or babel_env environment variables. valid values are "development", "test", and "production". instead, received: undefined.

编辑器 vs code

插件 eslint

解决方式：

vs code settings.json 配置文件中添加
"eslint.nodeEnv": "development"

才疏学浅，记录一下。