[babel 8] Type checking preset-react options (#12741)

Co-authored-by: Nicolò Ribaudo <nicolo.ribaudo@gmail.com>

Gulpfile.mjs

@@ -288,11 +288,18 @@ function buildRollup(packages, targetBrowsers) {
         input,
         external,
         onwarn(warning, warn) {
-          if (warning.code !== "CIRCULAR_DEPENDENCY") {
+          if (warning.code === "CIRCULAR_DEPENDENCY") return;
+          if (warning.code === "UNUSED_EXTERNAL_IMPORT") {
             warn(warning);
-            // https://github.com/babel/babel/pull/12011#discussion_r540434534
-            throw new Error("Rollup aborted due to warnings above");
+            return;
           }
+
+          // We use console.warn here since it prints more info than just "warn",
+          // in case we want to stop throwing for a specific message.
+          console.warn(warning);
+
+          // https://github.com/babel/babel/pull/12011#discussion_r540434534
+          throw new Error("Rollup aborted due to warnings above");
         },
         plugins: [
           rollupBabelSource(),
@@ -424,6 +431,7 @@ function copyDts(packages) {
 const libBundles = [
   "packages/babel-parser",
   "packages/babel-plugin-proposal-optional-chaining",
+  "packages/babel-preset-react",
   "packages/babel-preset-typescript",
   "packages/babel-helper-member-expression-to-functions",
   "packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining",