chore: fix test-coverage for new custom recma plugin

Author: talatkuyuk

src/utils/recma-mdx-import-react.ts

@@ -3,8 +3,11 @@ import type { Node, Program, VariableDeclaration } from "estree";
 import { CONTINUE, EXIT, visit } from "estree-util-visit";
 
 /**
- * It is a recma plugin which ensure getting React from argument[0]
- * It is a work around for the issue
+ *
+ * It is a recma plugin which ensure getting React from argument[0] in the compiled source
+ *
+ * It is a work around for the issue https://github.com/vercel/next.js/issues/76395
+ *
  */
 const plugin: Plugin<void[], Program> = () => {
   return (tree: Node) => {
@@ -32,18 +35,19 @@ const plugin: Plugin<void[], Program> = () => {
       kind: "const",
     };
 
-    visit(tree, (node, _, index) => {
+    visit(tree, (node, _, index, ancestors) => {
       if (index === undefined) return;
 
-      if (node.type !== "VariableDeclaration") return CONTINUE;
+      if (node.type === "VariableDeclaration") {
+        const parent = ancestors[0] as Program;
 
-      if (tree.type === "Program") {
-        tree["body"].splice(index, 0, variableDeclaration);
+        if ("body" in parent) {
+          parent["body"].splice(index, 0, variableDeclaration);
 
-        return EXIT;
+          return EXIT;
+        }
       }
 
-      /* istanbul ignore next */
       return CONTINUE;
     });
   };