babel 7.X变化

1. 使用npm的scope包@balbel/xxx
2. 所有阶段预设state-x均已弃用，使用plugin代替

{
  "plugins": [
    // Stage 0
    "@babel/plugin-proposal-function-bind",
 
    // Stage 1
    "@babel/plugin-proposal-export-default-from",
    "@babel/plugin-proposal-logical-assignment-operators",
    ["@babel/plugin-proposal-optional-chaining", { "loose": false }],
    ["@babel/plugin-proposal-pipeline-operator", { "proposal": "minimal" }],
    ["@babel/plugin-proposal-nullish-coalescing-operator", { "loose": false }],
    "@babel/plugin-proposal-do-expressions",
 
    // Stage 2
    ["@babel/plugin-proposal-decorators", { "legacy": true }], //解析装饰器
    "@babel/plugin-proposal-function-sent",
    "@babel/plugin-proposal-export-namespace-from",
    "@babel/plugin-proposal-numeric-separator",
    "@babel/plugin-proposal-throw-expressions",
 
    // Stage 3
    "@babel/plugin-syntax-dynamic-import",
    "@babel/plugin-syntax-import-meta",
    ["@babel/plugin-proposal-class-properties", { "loose": false }],
    "@babel/plugin-proposal-json-strings"
  ]
}

3. @babel/polyfill是@babel/runtime-corejs2的别名

{
  "presets": [
    ["@babel/preset-env", {"useBuiltIns": "usage"}]
  ],
  "plugins": [
    ["@babel/plugin-transform-runtime",{"corejs": 2}]
  ]
}

参考

babeljs 6.x
babeljs 7.x
关于babel 的一些包理解7.X版本