Use native ESM for dev scripts (#12296)

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

test/esm/babel-runtime-corejs3.js

@@ -0,0 +1,69 @@
+import assert from "assert";
+
+export default {
+  title: "@babel/runtime-corejs3",
+  testcases: [
+    [
+      "it should throw on unknown helpers",
+      () =>
+        assert.rejects(
+          async () =>
+            import("@babel/runtime-corejs3/helpers/esm/unknown-helper"),
+          {
+            name: "Error",
+            code: "ERR_MODULE_NOT_FOUND",
+          }
+        ),
+    ],
+    [
+      "it should not throw on helpers importing internal helpers",
+      () =>
+        assert.doesNotReject(
+          async () =>
+            import("@babel/runtime-corejs3/helpers/esm/wrapNativeSuper"),
+          Error
+        ),
+    ],
+    [
+      "it supports importing with explicit extension",
+      () =>
+        assert.doesNotReject(
+          async () => import("@babel/runtime/helpers/esm/wrapNativeSuper.js"),
+          Error
+        ),
+    ],
+    [
+      "it should not throw on importing core-js helpers",
+      () =>
+        assert.doesNotReject(
+          async () => import("@babel/runtime-corejs3/core-js/array/is-array"),
+          Error
+        ),
+    ],
+    [
+      "it should not throw on importing core-js helpers with explicit extension",
+      () =>
+        assert.doesNotReject(
+          async () =>
+            import("@babel/runtime-corejs3/core-js/array/is-array.js"),
+          Error
+        ),
+    ],
+    [
+      "it should not throw on importing regenerator helpers",
+      () =>
+        assert.doesNotReject(
+          async () => import("@babel/runtime-corejs3/regenerator"),
+          Error
+        ),
+    ],
+    [
+      "it should not throw on importing regenerator helpers with explicit extension",
+      () =>
+        assert.doesNotReject(
+          async () => import("@babel/runtime-corejs3/regenerator/index.js"),
+          Error
+        ),
+    ],
+  ],
+};