From da93c31af64ee28aa638969b4b6c6e145af5b227 Mon Sep 17 00:00:00 2001
From: Lars Grammel <lars.grammel@gmail.com>
Date: Thu, 9 Jul 2026 13:59:30 +0200
Subject: [PATCH] reproduction (reproduced)

---
 .../workflow-require-entrypoint.ts            | 181 ++++++++++++++++++
 1 file changed, 181 insertions(+)
 create mode 100644 examples/ai-functions/src/reproduction/workflow-require-entrypoint.ts

diff --git a/examples/ai-functions/src/reproduction/workflow-require-entrypoint.ts b/examples/ai-functions/src/reproduction/workflow-require-entrypoint.ts
new file mode 100644
index 000000000000..2874a58dc4c9
--- /dev/null
+++ b/examples/ai-functions/src/reproduction/workflow-require-entrypoint.ts
@@ -0,0 +1,181 @@
+import { execFile } from 'node:child_process';
+import { existsSync } from 'node:fs';
+import { cp, mkdir, mkdtemp, readFile, rm } from 'node:fs/promises';
+import { createRequire } from 'node:module';
+import { tmpdir } from 'node:os';
+import path from 'node:path';
+
+const packageName = '@ai-sdk/workflow';
+const packageVersion = '1.0.17';
+
+type PackFile = {
+  path: string;
+};
+
+type PackEntry = {
+  filename: string;
+  files: PackFile[];
+};
+
+type WorkflowPackageJson = {
+  main: string;
+  types: string;
+  exports: {
+    '.': {
+      import: string;
+      require: string;
+      types: string;
+    };
+  };
+};
+
+function runCommand(
+  command: string,
+  args: string[],
+  cwd: string,
+): Promise<{ stdout: string; stderr: string }> {
+  return new Promise((resolve, reject) => {
+    execFile(
+      command,
+      args,
+      { cwd, encoding: 'utf8', maxBuffer: 10 * 1024 * 1024 },
+      (error, stdout, stderr) => {
+        if (error != null) {
+          reject(Object.assign(error, { stdout, stderr }));
+          return;
+        }
+
+        resolve({ stdout, stderr });
+      },
+    );
+  });
+}
+
+function getErrorCode(error: unknown): string | undefined {
+  if (typeof error !== 'object' || error == null || !('code' in error)) {
+    return undefined;
+  }
+
+  const { code } = error as { code?: unknown };
+  return typeof code === 'string' ? code : undefined;
+}
+
+function getErrorMessage(error: unknown): string {
+  return error instanceof Error ? error.message : String(error);
+}
+
+async function main() {
+  const tempDirectory = await mkdtemp(
+    path.join(tmpdir(), 'ai-sdk-workflow-require-entrypoint-'),
+  );
+
+  try {
+    const { stdout } = await runCommand(
+      'npm',
+      [
+        'pack',
+        `${packageName}@${packageVersion}`,
+        '--json',
+        '--pack-destination',
+        tempDirectory,
+      ],
+      tempDirectory,
+    );
+    const [packEntry] = JSON.parse(stdout) as PackEntry[];
+
+    if (packEntry == null) {
+      throw new Error(`npm pack did not return metadata for ${packageName}`);
+    }
+
+    const tarballPath = path.join(tempDirectory, packEntry.filename);
+    const distFiles = packEntry.files
+      .map(file => file.path)
+      .filter(filePath => filePath.startsWith('dist/'))
+      .sort();
+
+    await runCommand(
+      'tar',
+      ['-xzf', tarballPath, '-C', tempDirectory],
+      tempDirectory,
+    );
+
+    const extractedPackageDirectory = path.join(tempDirectory, 'package');
+    const packageJson = JSON.parse(
+      await readFile(
+        path.join(extractedPackageDirectory, 'package.json'),
+        'utf8',
+      ),
+    ) as WorkflowPackageJson;
+
+    const installedPackageDirectory = path.join(
+      tempDirectory,
+      'node_modules',
+      '@ai-sdk',
+      'workflow',
+    );
+    await mkdir(path.dirname(installedPackageDirectory), { recursive: true });
+    await cp(extractedPackageDirectory, installedPackageDirectory, {
+      recursive: true,
+    });
+
+    const requireTarget = path.join(
+      installedPackageDirectory,
+      packageJson.exports['.'].require,
+    );
+    const typesTarget = path.join(
+      installedPackageDirectory,
+      packageJson.exports['.'].types,
+    );
+    const importTarget = path.join(
+      installedPackageDirectory,
+      packageJson.exports['.'].import,
+    );
+
+    console.log(`${packageName}@${packageVersion} dist files:`);
+    console.log(distFiles.map(filePath => `- ${filePath}`).join('\n'));
+    console.log(`main: ${packageJson.main}`);
+    console.log(`exports["."].require: ${packageJson.exports['.'].require}`);
+    console.log(`exports["."].types: ${packageJson.exports['.'].types}`);
+    console.log(`exports["."].import: ${packageJson.exports['.'].import}`);
+    console.log(`require target exists: ${existsSync(requireTarget)}`);
+    console.log(`types target exists: ${existsSync(typesTarget)}`);
+    console.log(`import target exists: ${existsSync(importTarget)}`);
+
+    const requireFromTempProject = createRequire(
+      path.join(tempDirectory, 'repro.cjs'),
+    );
+
+    try {
+      requireFromTempProject(packageName);
+    } catch (error) {
+      const message = getErrorMessage(error);
+
+      console.error(
+        `require("${packageName}") failed with ${getErrorCode(error)}:`,
+      );
+      console.error(message);
+
+      if (
+        getErrorCode(error) === 'MODULE_NOT_FOUND' &&
+        message.includes(path.join('dist', 'index.js'))
+      ) {
+        console.error(
+          'Reproduced: the CommonJS export points to a missing file.',
+        );
+        process.exitCode = 1;
+        return;
+      }
+
+      throw error;
+    }
+
+    console.log('Could not reproduce: require() succeeded.');
+  } finally {
+    await rm(tempDirectory, { recursive: true, force: true });
+  }
+}
+
+main().catch(error => {
+  console.error(error);
+  process.exitCode = 1;
+});