| name | nitropack-skilld |
| description | Build and Deploy Universal JavaScript Servers. ALWAYS use when writing code importing "nitropack". Consult for debugging, best practices, or modifying nitropack, nitro. |
| metadata | {"version":"2.13.4","generated_by":"cached","generated_at":"2026-05-31T00:00:00.000Z"} |
nitrojs/nitro nitropack@2.13.4
Tags: latest: 2.13.4
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API Changes — Nitro v2.13.3
This section documents API changes in the v2.x series — focus on deprecations, experimental APIs, and breaking changes that LLMs trained on older data may get wrong.
API Changes
DEPRECATED: defineNitroConfig() — Moved import location. Use defineNitroConfig() from nitropack/config instead of the core export source
DEPRECATED: NitroRuntimeConfig type — Moved to nitropack/types. Import from nitropack/types instead of the core export source
DEPRECATED: NitroRuntimeConfigApp type — Moved to nitropack/types. Import from nitropack/types instead of the core export source
DEPRECATED: NitroRuntimeHooks type — Moved to nitropack/types. Import from nitropack/types instead of the core export source
NEW: runTask() (experimental) — Execute a task at runtime. Returns Promise<{ result: unknown }>. Part of experimental tasks API requiring experimental.tasks: true in config source
NEW: listTasks() (experimental) — List all available tasks with metadata. Returns Promise<Record<string, { meta: { description: string } }>>. Part of experimental tasks API requiring experimental.tasks: true in config source
NEW: defineTask() (experimental) — Define a task handler. Accepts { meta?: { name?, description? }, run(event: TaskEvent) }. File-based tasks go in tasks/[name].ts. Nested directories supported with : separator (e.g. tasks/db/migrate.ts → db:migrate) source
NEW: defineRouteMeta() (experimental) — Build-time macro to define route metadata for OpenAPI and other integrations. Supports openAPI property with OpenAPI Operation Object. No runtime overhead — metadata statically extracted during build source
DEPRECATED: srcDir config option — Use serverDir instead. The srcDir option has been removed in favour of serverDir for clarity on its purpose source
DEPRECATED: edgio preset — Preset has been deprecated and should not be used for new projects source
NEW: ssrRoutes config option — Introduced in v2.12.0. Controls which routes participate in server-side rendering source
NEW: Dev presets — Introduced in v2.12.0. Allow preset-specific development server configuration. Example: cloudflare dev preset for local Cloudflare development source
NEW: Vercel skew protection support — Added in v2.13.0. Configure with Vercel preset to protect against deployment skew issues source
NEW: Bun runtime support — Added in v2.13.0 and v2.12.9. Set NITRO_BUN_IDLE_TIMEOUT env variable to configure idle timeout source
Also changed: OpenAPI experimental API (v2.12.0+) · NitroConfig.experimental.openAPI option · NitroConfig.experimental.tasks option · Cloudflare durable object publish method (v2.11.10+) experimental · OpenAPI extensible properties (v2.11.9+) · dotenv config for loadOptions() (v2.11.9+) · workspaceDir config option (v2.11.12+) · Type imports resolved for absolute paths (v2.11.13+) · tsConfig added to types:extend hook (v2.11.13+)
Best Practices
Cloudflare Workers Deployment
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Use nitro.preset: "cloudflare_module" for Cloudflare Workers on modern versions. The module preset is the recommended approach, generating production builds compatible with the Workers runtime. Pair it with nitro.cloudflare.wrangler in your Nuxt config to define bindings (D1, KV, R2, etc.) inline rather than using a separate wrangler.json at the repo root — this prevents Wrangler auto-discovery from duplicating configuration during the build.
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Separate dev and deploy Wrangler configs using nitro.cloudflareDev.configPath to point a non-standard-named config file (e.g., wrangler.dev.jsonc) for Miniflare bindings. The built-in cloudflare-dev preset in nitropack 2.13+ handles top-level await without the legacy nitro-cloudflare-dev module, eliminating globalThis.__env__ race conditions.
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Bind only emulated services locally — D1, KV, R2, metadata, and vars — in the dev config. Keep AI, BROWSER, IMAGES, and analytics bindings commented or omitted; getPlatformProxy() automatically switches to authenticated edge-preview for unemulated services, triggering remote authentication rather than failing.
Configuration & Build
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Pin Nitropack version in package.json rather than using loose semver ranges. Preset changes and Wrangler integration behaviours shift between minor versions; explicit pinning prevents surprise build failures in CI/CD.
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Run wrangler types as part of the build step. Generate worker-configuration.d.ts to ensure TypeScript sees the correct Cloudflare binding types. Include this in your build script after the Nuxt build completes.
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Use nitro.rollupConfig to define shared Rollup options (e.g., external dependencies, plugin chains) rather than duplicating config across preset-specific blocks. This centralises build metadata and prevents preset-specific build regressions.
Middleware & Routing
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Avoid adding middleware to server/middleware/ for simple route guards. Use route-level middleware in your pages/layouts (Nuxt's defineRouteMiddleware) instead; it's tree-shakeable and composable, whereas server middleware runs for every request. Server middleware is best reserved for cross-cutting concerns (logging, security headers, authentication checks on protected routes).
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Define API routes under server/routes/api/ using the defineEventHandler pattern. Routes are file-based and auto-discovered; keep them flat or shallow (max 2-3 levels) to avoid route collision bugs with dynamic parameters.
Performance & Caching
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Set explicit Cache-Control headers on cacheable assets in event handlers using setHeader(event, 'Cache-Control', 'public, max-age=...'). Cloudflare caches based on these headers; omitting them means every request hits your origin.
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Disable automatic SSR rendering for heavy or dynamic pages when edge-side rendering is sufficient. Use routeRules to set ssr: false on routes where client-side hydration alone is acceptable (e.g., dashboards, logged-in-only pages). This reduces payload size and origin latency.
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Prefer streaming responses for large payloads. Use sendStream() or Node streams in event handlers rather than buffering entire responses in memory. Cloudflare Workers have a response size limit; streaming sidesteps it.
Type Safety & Runtime
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Export server types separately from client code. Define a server/types/index.ts barrel exporting event handler types and use dynamic ReturnType<typeof getHandler> in your frontend code to keep server internals inaccessible to client bundles. This prevents accidental client-side exposure of sensitive utilities.
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Validate environment variables at runtime using Zod or similar. Nitropack injects process.env and NUXT_PUBLIC_* vars at build time; validate them in a top-level server/utils/env.ts utility so misconfigurations fail fast during deployment, not during a cold start.
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Use useAsyncData with explicit cache keys in layouts/pages. Nitropack pairs well with Nuxt's data-fetching composables; always pass key: 'unique-identifier' to avoid cache collisions across routes. Pair with server/routes/api/ endpoints to centralise data logic.
Source guidance: Patterns derived from nitropack 2.13.4 documentation (Cloudflare integration, config patterns), Nuxt 4 async data patterns, and Cloudflare Workers best practices. Each point prioritises production reliability, type safety, and edge-platform idioms.
