babel須要這樣配置

安裝

npm i @babel/core @babel/preset-env -D

安裝

npm i @babel/runtime -S

安裝

npm i @babel/plugin-transform-runtime -D

配置.babelrc

{
  "presets": ["@babel/preset-env"],
  "plugins": ["@babel/plugin-transform-runtime"]
}

 安裝

npm install core-js@3 -S

npm install regenerator-runtime -S

修改.babelrc

{
  "presets": [
    ["@babel/preset-env", {
      "modules": false,
      "targets": {
        "browsers": ["> 1%", "last 2 versions", "not ie <= 8"]
      },
      "useBuiltIns": "usage",
      "corejs": 3
    }]
  ],
  "plugins": [
    "@babel/plugin-transform-runtime"
  ]
}