Remove core-js and @babel/transform-runtime from lib code

Also remove stage-4 syntax transforms covered by @babel/preset-env

Author: wegry

babel.config.js

@@ -0,0 +1,22 @@
+const BABEL_ENV = process.env.BABEL_ENV;
+const IS_TEST = BABEL_ENV === "test"
+const ignore = IS_TEST ? [] : ['test/**/*.js']
+const targets = IS_TEST ? { node: "current" } : { browsers: "defaults" }
+
+module.exports = {
+  presets: [
+    [
+      "@babel/preset-env",
+      {
+        modules: ["cjs", "test"].includes(BABEL_ENV) ? "commonjs" : false,
+        targets
+      },
+    ],
+    "@babel/preset-react"
+  ],
+  plugins: [
+    "@babel/plugin-proposal-class-properties",
+    "@babel/plugin-proposal-optional-chaining"
+  ],
+  ignore,
+};

packages/antd/babel.config.js

@@ -1,48 +1,3 @@
-const BABEL_ENV = process.env.BABEL_ENV;
+const defaultConfig = require('../../babel.config')
 
-const defaultPlugins = [];
-
-module.exports = {
-  "presets": [
-    [
-      "@babel/preset-env",
-      {
-        modules: ["cjs", "test"].includes(BABEL_ENV) ? "commonjs" : false,
-        targets:
-          BABEL_ENV === "test" ? { node: "current" } : { browsers: "defaults" },
-      },
-    ],
-    "@babel/preset-react"
-  ],
-  "plugins": [
-    "@babel/plugin-proposal-object-rest-spread",
-    "@babel/plugin-proposal-class-properties",
-    [
-      "@babel/plugin-transform-runtime",
-      {
-        "corejs": 2
-      }
-    ]
-  ],
-  "env": {
-    cjs: {
-      plugins: defaultPlugins,
-      ignore: ['test/**/*.js']
-    },
-    umd: {
-      plugins: defaultPlugins,
-      ignore: ['test/**/*.js']
-    },
-    es: {
-      plugins: [
-        ...defaultPlugins,
-        ['@babel/plugin-transform-runtime', { useESModules: true, corejs: 2 }]
-      ],
-      ignore: ['test/**/*.js']
-    },
-    test: {
-      plugins: defaultPlugins,
-      ignore: []
-    }
-  }
-};
+module.exports = defaultConfig

packages/antd/package-lock.json

@@ -28,7 +28,6 @@
     "@rjsf/core": "^2.0.0",
     "antd": "^4.0.0",
     "antd-dayjs-webpack-plugin": "1.0.0",
-    "core-js": "^2.5.7",
     "dayjs": "^1.8.0",
     "lodash": "^4.17.15",
     "react": ">=16"
@@ -38,20 +37,16 @@
     "@babel/cli": "^7.4.4",
     "@babel/core": "^7.4.5",
     "@babel/plugin-proposal-class-properties": "^7.5.5",
-    "@babel/plugin-proposal-object-rest-spread": "^7.5.5",
     "@babel/plugin-transform-react-jsx": "^7.3.0",
-    "@babel/plugin-transform-runtime": "^7.5.5",
     "@babel/preset-env": "^7.10.3",
     "@babel/preset-react": "^7.0.0",
     "@babel/register": "^7.4.4",
-    "@babel/runtime-corejs2": "^7.10.3",
     "@rjsf/core": "^2.4.0",
     "antd": "^4.0.0",
     "atob": "^2.0.3",
     "babel-eslint": "^10.0.1",
     "babel-loader": "^8.0.6",
     "concurrently": "^5.1.0",
-    "core-js": "^2.5.7",
     "cross-env": "^2.0.1",
     "css-loader": "^3.2.0",
     "dayjs": "^1.8.0",