create-react-app mobx 不支持 修飾器

1.npm run eject (返編譯)
2.npm i (所有從新安裝依賴)
3.npm install --save-dev babel-plugin-transform-decorators-legacy (安裝該模塊中間可能有告警自行消除便可)
4.npm install @babel/plugin-proposal-decorators
5.在 package.json 裏修改 babel 以下所示
"babel": {
"plugins":[

[
  "@babel/plugin-proposal-decorators",
  {
    "legacy":true
  }
],
[
  "@babel/plugin-proposal-class-properties",
  {
    "loose":true
  }
]

],
"presets":[

"react-app"

]
},
6npm start就能夠了