build(babel): Remove un-needed babel plugins (#21701)

* Removes object spread plugin, this is included in `@babel/preset-env`
* Removes syntax dynamic import, which is supported by webpack (and `dynamic-import-node` for jest)

babel.config.js

@@ -14,8 +14,6 @@ module.exports = {
     ],
   ],
   plugins: [
-    '@babel/plugin-syntax-dynamic-import',
-    '@babel/plugin-proposal-object-rest-spread',
     '@babel/plugin-transform-runtime',
     // NOTE: The order of the decorator and class-property plugins is important
     // here. Decorators must be processed first before class properties, see:
@@ -59,6 +57,7 @@ module.exports = {
       ].filter(Boolean),
     },
     test: {
+      // Required, see https://github.com/facebook/jest/issues/9430
       plugins: ['dynamic-import-node'],
     },
   },

package.json

@@ -10,8 +10,6 @@
     "@babel/core": "~7.12.3",
     "@babel/plugin-proposal-class-properties": "~7.12.1",
     "@babel/plugin-proposal-decorators": "~7.12.1",
-    "@babel/plugin-proposal-object-rest-spread": "~7.12.1",
-    "@babel/plugin-syntax-dynamic-import": "^7.8.3",
     "@babel/plugin-transform-runtime": "~7.12.1",
     "@babel/preset-env": "~7.12.1",
     "@babel/preset-react": "^7.12.1",

yarn.lock

@@ -505,7 +505,16 @@
     "@babel/helper-plugin-utils" "^7.8.0"
     "@babel/plugin-syntax-object-rest-spread" "^7.8.0"
 
-"@babel/plugin-proposal-object-rest-spread@^7.0.0", "@babel/plugin-proposal-object-rest-spread@^7.12.1", "@babel/plugin-proposal-object-rest-spread@^7.6.2", "@babel/plugin-proposal-object-rest-spread@~7.12.1":
+"@babel/plugin-proposal-object-rest-spread@^7.0.0", "@babel/plugin-proposal-object-rest-spread@^7.6.2":
+  version "7.9.5"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-proposal-object-rest-spread/-/plugin-proposal-object-rest-spread-7.9.5.tgz#3fd65911306d8746014ec0d0cf78f0e39a149116"
+  integrity sha512-VP2oXvAf7KCYTthbUHwBlewbl1Iq059f6seJGsxMizaCdgHIeczOr7FBqELhSqfkIl04Fi8okzWzl63UKbQmmg==
+  dependencies:
+    "@babel/helper-plugin-utils" "^7.8.3"
+    "@babel/plugin-syntax-object-rest-spread" "^7.8.0"
+    "@babel/plugin-transform-parameters" "^7.9.5"
+
+"@babel/plugin-proposal-object-rest-spread@^7.12.1":
   version "7.12.1"
   resolved "https://registry.yarnpkg.com/@babel/plugin-proposal-object-rest-spread/-/plugin-proposal-object-rest-spread-7.12.1.tgz#def9bd03cea0f9b72283dac0ec22d289c7691069"
   integrity sha512-s6SowJIjzlhx8o7lsFx5zmY4At6CTtDvgNQDdPzkBQucle58A6b/TTeEBYtyDgmcXjUTM+vE8YOGHZzzbc/ioA==
@@ -568,7 +577,7 @@
   dependencies:
     "@babel/helper-plugin-utils" "^7.10.4"
 
-"@babel/plugin-syntax-dynamic-import@^7.2.0", "@babel/plugin-syntax-dynamic-import@^7.8.0", "@babel/plugin-syntax-dynamic-import@^7.8.3":
+"@babel/plugin-syntax-dynamic-import@^7.2.0", "@babel/plugin-syntax-dynamic-import@^7.8.0":
   version "7.8.3"
   resolved "https://registry.yarnpkg.com/@babel/plugin-syntax-dynamic-import/-/plugin-syntax-dynamic-import-7.8.3.tgz#62bf98b2da3cd21d626154fc96ee5b3cb68eacb3"
   integrity sha512-5gdGbFon+PszYzqs83S3E5mpi7/y/8M9eC90MRTZfduQOYW76ig6SOSPNe41IG5LoP3FGBn2N0RjVDSQiS94kQ==