create-react-app @observer装饰器报错

npm install --save-dev babel-plugin-transform-decorators-legacy

然后在node_modules/babel-preset-react-app/create.js plugins中添加
require.resolve('babel-plugin-transform-decorators-legacy')

babel  为7.X版本时

npm install --save-dev   @babel/plugin-proposal-decorators

然后在node_modules/_babel-preset-react-app@5.0.4@babel-preset-react-app/create.js plugins 中添加

[ require('@babel/plugin-proposal-decorators'), { "legacy": true, } ],