chore(v2): Adopt corejs 3 and only import at entry point (#3055)

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

@@ -25,8 +25,8 @@ function getSWBabelLoader() {
         [
           require.resolve('@babel/preset-env'),
           {
-            useBuiltIns: 'usage',
-            corejs: '2',
+            useBuiltIns: 'entry',
+            corejs: '3',
             // See https://twitter.com/jeffposnick/status/1280223070876315649
             targets: 'chrome >= 56',
           },

packages/docusaurus/package.json

@@ -44,6 +44,7 @@
     "@babel/preset-react": "^7.9.4",
     "@babel/preset-typescript": "^7.9.0",
     "@babel/runtime": "^7.9.2",
+    "@babel/runtime-corejs3": "^7.10.4",
     "@docusaurus/types": "^2.0.0-alpha.58",
     "@docusaurus/utils": "^2.0.0-alpha.58",
     "@endiliey/static-site-generator-webpack-plugin": "^4.0.0",

packages/docusaurus/src/babel/preset.ts

@@ -27,9 +27,9 @@ function getTransformOptions(isServer: boolean): TransformOptions {
         : [
             require.resolve('@babel/preset-env'),
             {
-              useBuiltIns: 'usage',
+              useBuiltIns: 'entry',
               loose: true,
-              corejs: '2',
+              corejs: '3',
               // Do not transform modules to CJS
               modules: false,
               // Exclude transforms that make all code slower

yarn.lock

@@ -1163,6 +1163,14 @@
     pirates "^4.0.0"
     source-map-support "^0.5.16"
 
+"@babel/runtime-corejs3@^7.10.4":
+  version "7.10.4"
+  resolved "https://registry.yarnpkg.com/@babel/runtime-corejs3/-/runtime-corejs3-7.10.4.tgz#f29fc1990307c4c57b10dbd6ce667b27159d9e0d"
+  integrity sha512-BFlgP2SoLO9HJX9WBwN67gHWMBhDX/eDz64Jajd6mR/UAUzqrNMm99d4qHnVaKscAElZoFiPv+JpR/Siud5lXw==
+  dependencies:
+    core-js-pure "^3.0.0"
+    regenerator-runtime "^0.13.4"
+
 "@babel/runtime-corejs3@^7.7.4":
   version "7.7.7"
   resolved "https://registry.yarnpkg.com/@babel/runtime-corejs3/-/runtime-corejs3-7.7.7.tgz#78fcbd472daec13abc42678bfc319e58a62235a3"