nextjs - 💡(How to fix) Fix [Turbopack] Build fails with "module factory is not available" when using `export * as X from "."` [5 comments, 4 participants]

Error: Module 8147 was instantiated because it was required from module 56356, but the module factory is not available.

TL;DR

Replace the export * as X from "." pattern with TypeScript namespaces to resolve the Turbopack build failure.

Guidance

• Identify all occurrences of the export * as X from "." pattern in the codebase and consider replacing them with TypeScript namespaces.
• Verify that the replacement does not introduce any new issues or errors by testing the build and runtime behavior.
• If replacing the pattern is not feasible, consider using Webpack instead of Turbopack for production builds, as the issue does not occur with Webpack.
• Investigate whether there are any open issues or pull requests in the Turbopack repository that address this specific problem.

Example

// Before
export * as User from "."

// After
export namespace User {
  export function fromSession() { ... }
}

Notes

This solution assumes that replacing the export * as X from "." pattern with TypeScript namespaces does not introduce any significant changes to the code's behavior or functionality. Additionally, this workaround may not be suitable for all use cases, and further investigation may be necessary to determine the root cause of the issue.

Recommendation

Apply workaround: Replace the export * as X from "." pattern with TypeScript namespaces, as this is a known solution that resolves the build failure with Turbopack.