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                >[success] # babel -- 初步上手之各種配置(@babel/polyfill )(過去式) ~~~ 1.你可能在各種老文章中看到'@babel/polyfill ' 這個包使用,但他僅僅停留在以前 2.@babel/polyfill 模塊包括 core-js 和一個自定義的 regenerator runtime 模塊, 隨著'core-js@3'的更新,'@babel/polyfill'無法從'core-js@2'過渡到'core-js@3',所 以'@babel/polyfill'已經被放棄, 3.在使用上 導入 "import 'babel-polyfill' ",但是在babel 7.4 版本后 @babel/polyfill 已經被廢棄,需單獨安裝 core-js 和 regenerator-runtime 模塊 4.現在已經不用了,即使你要用在配置的babel 文件講'"corejs": 2, '這樣設置即可,單單的不同僅是他們 的corejs 版本的差異的指定 ~~~ >[danger] ##### 總結 ~~~ 1.這個包已經被棄用,現在可以更簡單的通過配置 "@babel/env"的"useBuiltIns": "entry" 即可,如 果非要將"useBuiltIns": "false",也是推薦分別引入 import "core-js/stable"; import "regenerator-runtime/runtime"; ~~~
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