codemod: add separator to the parenthenese expr (#71993)

packages/next-codemod/transforms/__testfixtures__/next-async-request-api-dynamic-apis/async-api-11.output.tsx

@@ -1,10 +1,10 @@
 import { headers, type UnsafeUnwrappedHeaders } from 'next/headers';
 
 export function MyComp() {
-  (headers() as unknown as UnsafeUnwrappedHeaders)
+  void (headers() as unknown as UnsafeUnwrappedHeaders)
 }
 
 export function generateContentfulMetadata() {
-  (headers() as unknown as UnsafeUnwrappedHeaders)
+  void (headers() as unknown as UnsafeUnwrappedHeaders)
 }
 

packages/next-codemod/transforms/__testfixtures__/next-async-request-api-dynamic-apis/async-api-19.output.tsx

@@ -8,6 +8,6 @@ export function myFun() {
 
 export function myFun2() {
   return function () {
-    (headers() as unknown as UnsafeUnwrappedHeaders)
+    void (headers() as unknown as UnsafeUnwrappedHeaders)
   };
 }

packages/next-codemod/transforms/__testfixtures__/next-async-request-api-dynamic-apis/async-api-25.input.tsx

@@ -0,0 +1,6 @@
+import { cookies } from 'next/headers'
+
+export function myFunc() {
+  const c = cookies()
+  cookies()
+}

packages/next-codemod/transforms/__testfixtures__/next-async-request-api-dynamic-apis/async-api-25.output.tsx

@@ -0,0 +1,6 @@
+import { cookies, type UnsafeUnwrappedCookies } from 'next/headers';
+
+export function myFunc() {
+  const c = (cookies() as unknown as UnsafeUnwrappedCookies)
+  void (cookies() as unknown as UnsafeUnwrappedCookies)
+}

packages/next-codemod/transforms/lib/async-request-api/next-async-dynamic-api.ts

@@ -338,7 +338,26 @@ function castTypesOrAddComment(
     )
     // Replace the original expression with the new cast expression,
     // also wrap () around the new cast expression.
-    j(path).replaceWith(j.parenthesizedExpression(newCastExpression))
+    const parent = path.parent.value
+    const wrappedExpression = j.parenthesizedExpression(newCastExpression)
+    path.replace(wrappedExpression)
+
+    // If the wrapped expression `(<expression>)` is the beginning of an expression statement,
+    // add a void operator to separate the statement, to avoid syntax error that being treated as part of previous statement.
+    // example:
+    // input:
+    // <expression>
+    // <expression>
+    // output:
+    // (<expression> as ...)
+    // void (<expression> as ...)
+    if (
+      j.ExpressionStatement.check(parent) &&
+      parent.expression === path.node
+    ) {
+      // append a semicolon to the start of the expression statement
+      parent.expression = j.unaryExpression('void', parent.expression)
+    }
     modified = true
 
     // If cast types are not imported, add them to the import list