bug solved | This experimental syntax requires enabling xxx

LiberHome發表於2023-03-26
UI

另外，這倆問題是我在mobx中使用ES7裝飾器語法用到的，用普通的ES6語法是不會碰到這樣的問題，嫌麻煩也可以不用裝飾器語法，奈何我對這種看上去像Spring註釋的語法垂涎已久。

bug1

Experimental support for decorators is a feature that is subject to change in a future release. Set the 'experimentalDecorators' option in your 'tsconfig' or 'jsconfig' to remove this warning.ts(1219)

問題出在IDE不認識這個語法 以vscode為例 需要在setting中搜“experimentalDecorators”然後勾選上

bug2

Parsing error: This experimental syntax requires enabling one of the following parser plugin(s): "decorators", "decorators-legacy". (22:4)eslint

問題出在專案本身不認識這個語法（當前這個語法還在試驗階段 babel還沒有正式釋出），這個解決起來稍微有點麻煩，翻了很久stackoverflow和github issue，回答都是支支吾吾 遮遮掩掩，故作此篇，以饗後人。

step1:

npm i @babel/core @babel/plugin-proposal-decorators @babel/preset-env

step2:
專案根目錄下建立.babelrc

{
  "presets": ["@babel/preset-env"],
  "plugins": [["@babel/plugin-proposal-decorators", { "legacy": true }]]
}

step3:
專案根目錄下建立config-overrides.js

const path = require('path')
const { override, addDecoratorsLegacy } = require('customize-cra')
function resolve(dir) { return path.join(__dirname, dir) }
const customize = () => (config, env) => {
    config.resolve.alias['@'] = resolve('src')
    if (env === 'production') { config.externals = { 'react': 'React', 'react-dom': 'ReactDOM' } }
    return config
}; module.exports = override(addDecoratorsLegacy(), customize())

step4:
npm i customize-cra react-app-rewired

step5:
修改package.json

  "scripts": {
    "start": "react-app-rewired start",
    "build": "react-app-rewired build",
    "test": "react-app-rewired test",
    "eject": "react-app-rewired eject"
  },

然後重啟伺服器 再次npm start

bug3

報錯 Plugin "react" was conflicted between "package.json ...
然後開啟package.json ctrl/command + s 就好啦

（最後這裡vscode如果出問題，，重啟伺服器不管用，可以嘗試換了一個IDE 比如webstorm）

happy hacking~

相關文章