Fixed null error in plugin opts and added a test for it (#9945)

* Fixed null error in plugin opts and added a test for it

* Remove !opts and add opts === null check to avoid confusion with false and undefined cases

Co-Authored-By: divbhasin <divbest99@gmail.com>

packages/babel-core/src/config/validation/option-assertions.js

@@ -337,7 +337,7 @@ function assertPluginItem(loc: GeneralPath, value: mixed): PluginItem {
       if (
         opts !== undefined &&
         opts !== false &&
-        (typeof opts !== "object" || Array.isArray(opts))
+        (typeof opts !== "object" || Array.isArray(opts) || opts === null)
       ) {
         throw new Error(
           `${msg(access(loc, 1))} must be an object, false, or undefined`,

packages/babel-core/test/option-manager.js

@@ -38,6 +38,17 @@ describe("option-manager", () => {
       expect(calls).toEqual([]);
     });
 
+    it("throws for null options", () => {
+      const { calls, plugin } = makePlugin();
+      expect(() => {
+        loadOptions({
+          plugins: [[plugin, null]],
+        }).toThrow(/.plugins[0][1] must be an object, false, or undefined/);
+      });
+
+      expect(calls).toEqual([]);
+    });
+
     it("should not throw if a repeated plugin has a different name", () => {
       const { calls: calls1, plugin: plugin1 } = makePlugin();
       const { calls: calls2, plugin: plugin2 } = makePlugin();
@@ -87,7 +98,6 @@ describe("option-manager", () => {
       expect(calls1).toEqual([{ arg: 1 }]);
       expect(calls2).toEqual([{ arg: 2 }]);
     });
-
     it("should merge .env[] presets with parent presets", () => {
       const { calls: calls1, plugin: preset1 } = makePlugin();
       const { calls: calls2, plugin: preset2 } = makePlugin();