nextjs-16-server-action-requirements

Next.js 16 server actions fail to build because all exported functions in server-action files must be async. You must enforce async exports and await all helper calls to prevent these build errors.

To prevent forced dynamic rendering in Next.js 16, use dynamic imports for next/headers instead of static imports. This import pattern guidance ensures your server actions remain compliant.

No, you cannot export constants or types from Next.js 16 server action files. The strict requirements prohibit exporting non-async values, constants, or enums to prevent build-time failures.

To migrate server actions from Next.js 15 to 16, apply the migration checklist: enforce async exports, prohibit exporting constants, use dynamic imports for next/headers, and await all helper calls.

Next.js 16 server-action requirements mandate awaiting all helper calls. Failing to await helper calls in server action files violates the async export enforcement and causes build-time failures.