fix(check): ignore build output from other toolchains

packages/vinext/src/check.ts

@@ -367,13 +367,7 @@ function findSourceFiles(
   for (const entry of entries) {
     const fullPath = path.join(dir, entry.name);
     if (entry.isDirectory()) {
-      if (
-        entry.name === "node_modules" ||
-        entry.name === ".next" ||
-        entry.name === "dist" ||
-        entry.name === ".git"
-      )
-        continue;
+      if (IGNORED_DIRECTORIES.has(entry.name)) continue;
       results.push(...findSourceFiles(fullPath, extensions));
     } else if (extensions.some((ext) => entry.name.endsWith(ext))) {
       results.push(fullPath);
@@ -382,6 +376,27 @@ function findSourceFiles(
   return results;
 }
 
+/**
+ * Directories that never contain application source: dependency trees,
+ * VCS data, and — importantly for migrations — build output from other
+ * toolchains (Next.js/OpenNext/Nitro/wrangler). Scanning them reports
+ * bundled artifacts as source and produces false compatibility findings.
+ */
+const IGNORED_DIRECTORIES = new Set([
+  "node_modules",
+  ".git",
+  ".next",
+  "dist",
+  ".open-next",
+  ".wrangler",
+  ".vinext",
+  ".output",
+  ".turbo",
+  ".vercel",
+  "build",
+  "out",
+]);
+
 /**
  * Find files that can contribute to the application compatibility surface.
  * Test modules and test-runner configuration are executed by their own runners

tests/check.test.ts

@@ -216,6 +216,20 @@ describe("scanImports", () => {
     expect(items[0].name).toBe("next/image");
   });
 
+  it("ignores build output from other toolchains during migrations", () => {
+    // An OpenNext deployment's worker bundle and wrangler's local state
+    // contain bundled next/* imports and CJS globals that are not
+    // application source; reporting them blocks real migration findings.
+    writeFile(".open-next/server-functions/default/handler.mjs", `import Link from "next/link";`);
+    writeFile(".wrangler/state/v3/d1/cache.js", `import { useAmp } from "next/amp";`);
+    writeFile(".output/server/index.mjs", `import Link from "next/link";`);
+    writeFile("app/page.tsx", `import Image from "next/image";`);
+
+    const items = scanImports(tmpDir);
+    expect(items).toHaveLength(1);
+    expect(items[0].name).toBe("next/image");
+  });
+
   it("ignores imports used only by test modules and tool config files", () => {
     writeFile("app/page.test.tsx", `import { useAmp } from "next/amp";`);
     writeFile("vitest.config.ts", `import { useAmp } from "next/amp";`);