refactor: remove Babel plugins that are included in preset-env (#6614)

packages/docusaurus-plugin-pwa/package.json

@@ -20,8 +20,6 @@
   },
   "license": "MIT",
   "dependencies": {
-    "@babel/plugin-proposal-nullish-coalescing-operator": "^7.16.0",
-    "@babel/plugin-proposal-optional-chaining": "^7.16.0",
     "@babel/preset-env": "^7.16.11",
     "@docusaurus/core": "2.0.0-beta.15",
     "@docusaurus/theme-common": "2.0.0-beta.15",

packages/docusaurus-plugin-pwa/src/index.ts

@@ -37,11 +37,6 @@ function getSWBabelLoader() {
           },
         ],
       ],
-      plugins: [
-        require.resolve('@babel/plugin-proposal-object-rest-spread'),
-        require.resolve('@babel/plugin-proposal-optional-chaining'),
-        require.resolve('@babel/plugin-proposal-nullish-coalescing-operator'),
-      ],
     },
   };
 }

packages/docusaurus-theme-classic/babel.config.js

@@ -12,14 +12,9 @@ module.exports = {
     // we mostly need to transpile some features so that node does not crash...
     lib: {
       presets: [
+        ['@babel/preset-env', {targets: {node: 14}, modules: 'commonjs'}],
         ['@babel/preset-typescript', {isTSX: true, allExtensions: true}],
       ],
-      // Useful to transpile for older node versions
-      plugins: [
-        '@babel/plugin-transform-modules-commonjs',
-        '@babel/plugin-proposal-nullish-coalescing-operator',
-        '@babel/plugin-proposal-optional-chaining',
-      ],
     },
 
     // USED FOR JS SWIZZLE