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API ReferenceAdaptersOutput Types

Output Types

Last updated March 31, 2026

The outputs object contains arrays of build output types:

  • outputs.pages: React pages from the pages/ directory
  • outputs.pagesApi: API routes from pages/api/
  • outputs.appPages: React pages from the app/ directory
  • outputs.appRoutes: API and metadata routes from app/
  • outputs.prerenders: ISR-enabled routes and static prerenders
  • outputs.staticFiles: Static assets and auto-statically optimized pages
  • outputs.middleware: Middleware function (if present)

Note: When config.output is set to 'export', only outputs.staticFiles is populated. All other arrays (pages, appPages, pagesApi, appRoutes, prerenders) will be empty since the entire application is exported as static files.

For any route output with runtime: 'edge', edgeRuntime is included and contains the canonical entry metadata for invoking that output in your edge runtime.

Pages (outputs.pages)

React pages from the pages/ directory:

{
  type: 'PAGES'
  id: string           // Route identifier
  filePath: string     // Path to the built file
  pathname: string     // URL pathname
  sourcePage: string   // Original source file path in pages/ directory
  runtime: 'nodejs' | 'edge'
  assets: Record<string, string>  // Traced dependencies (key: relative path from repo root, value: absolute path)
  wasmAssets?: Record<string, string>  // Bundled wasm files (key: name, value: absolute path)
  edgeRuntime?: {
    modulePath: string    // Absolute path to the module registered in the edge runtime
    entryKey: string      // Canonical key used by the edge entry registry
    handlerExport: string // Export name to invoke, currently 'handler'
  }
  config: {
    maxDuration?: number  // Maximum duration of the route in seconds
    preferredRegion?: string | string[]  // Preferred deployment region
    env?: Record<string, string>  // Environment variables (edge runtime only)
  }
}

API Routes (outputs.pagesApi)

API routes from pages/api/:

{
  type: 'PAGES_API'
  id: string           // Route identifier
  filePath: string     // Path to the built file
  pathname: string     // URL pathname
  sourcePage: string   // Original relative source file path
  runtime: 'nodejs' | 'edge'
  assets: Record<string, string>  // Traced dependencies (key: relative path from repo root, value: absolute path)
  wasmAssets?: Record<string, string>  // Bundled wasm files (key: name, value: absolute path)
  edgeRuntime?: {
    modulePath: string    // Absolute path to the module registered in the edge runtime
    entryKey: string      // Canonical key used by the edge entry registry
    handlerExport: string // Export name to invoke, currently 'handler'
  }
  config: {
    maxDuration?: number  // Maximum duration of the route in seconds
    preferredRegion?: string | string[]  // Preferred deployment region
    env?: Record<string, string>  // Environment variables (edge runtime only)
  }
}

App Pages (outputs.appPages)

React pages from the app/ directory:

{
  type: 'APP_PAGE'
  id: string           // Route identifier
  filePath: string     // Path to the built file
  pathname: string     // URL pathname.Includes .rsc suffix for RSC routes
  sourcePage: string   // Original relative source file path
  runtime: 'nodejs' | 'edge' // Runtime the route is built for
  assets: Record<string, string>  // Traced dependencies (key: relative path from repo root, value: absolute path)
  wasmAssets?: Record<string, string>  // Bundled wasm files (key: name, value: absolute path)
  edgeRuntime?: {
    modulePath: string    // Absolute path to the module registered in the edge runtime
    entryKey: string      // Canonical key used by the edge entry registry
    handlerExport: string // Export name to invoke, currently 'handler'
  }
  config: {
    maxDuration?: number  // Maximum duration of the route in seconds
    preferredRegion?: string | string[]  // Preferred deployment region
    env?: Record<string, string>  // Environment variables (edge runtime only)
  }
}

App Routes (outputs.appRoutes)

API and metadata routes from the app/ directory:

{
  type: 'APP_ROUTE'
  id: string           // Route identifier
  filePath: string     // Path to the built file
  pathname: string     // URL pathname
  sourcePage: string   // Original relative source file path
  runtime: 'nodejs' | 'edge' // Runtime the route is built for
  assets: Record<string, string>  // Traced dependencies (key: relative path from repo root, value: absolute path)
  wasmAssets?: Record<string, string>  // Bundled wasm files (key: name, value: absolute path)
  edgeRuntime?: {
    modulePath: string    // Absolute path to the module registered in the edge runtime
    entryKey: string      // Canonical key used by the edge entry registry
    handlerExport: string // Export name to invoke, currently 'handler'
  }
  config: {
    maxDuration?: number  // Maximum duration of the route in seconds
    preferredRegion?: string | string[]  // Preferred deployment region
    env?: Record<string, string>  // Environment variables (edge runtime only)
  }
}

Prerenders (outputs.prerenders)

ISR-enabled routes and static prerenders:

{
  type: 'PRERENDER'
  id: string           // Route identifier
  pathname: string     // URL pathname
  parentOutputId: string  // ID of the source page/route
  groupId: number        // Revalidation group identifier (prerenders with same groupId revalidate together)
  pprChain?: {
    headers: Record<string, string>  // PPR chain headers (e.g., 'next-resume': '1')
  }
  parentFallbackMode?: false | null | string  // false: no additional paths (fallback: false), null: blocking render, string: path to HTML fallback
  fallback?: {
    filePath: string | undefined  // Path to the fallback file (HTML, JSON, or RSC)
    initialStatus?: number  // Initial status code
    initialHeaders?: Record<string, string | string[]>  // Initial headers
    initialExpiration?: number  // Initial expiration time in seconds
    initialRevalidate?: number | false  // Initial revalidate time in seconds, or false for fully static
    postponedState: string | undefined  // Serialized PPR state used for resuming rendering
  }
  config: {
    allowQuery?: string[]     // Allowed query parameters considered for the cache key
    allowHeader?: string[]    // Allowed headers for ISR
    bypassFor?: RouteHas[]    // Cache bypass conditions
    renderingMode?: 'STATIC' | 'PARTIALLY_STATIC'  // STATIC: fully static, PARTIALLY_STATIC: PPR-enabled
    partialFallback?: boolean  // Serves a partial fallback shell that should be upgraded to a full route in the background
    bypassToken?: string      // Generated token that signals the prerender cache should be bypassed
  }
}

Static Files (outputs.staticFiles)

Static assets and auto-statically optimized pages:

{
  type: 'STATIC_FILE'
  id: string // Route identifier
  filePath: string // Path to the built file
  pathname: string // URL pathname
  immutableHash: string | undefined // Content hash when the filename contains a hash, indicating the file is immutable
}

Middleware (outputs.middleware)

middleware.ts (.js/.ts) or proxy.ts (.js/.ts) function (if present):

{
  type: 'MIDDLEWARE'
  id: string           // Route identifier
  filePath: string     // Path to the built file
  pathname: string      // Always '/_middleware'
  sourcePage: string    // Always 'middleware'
  runtime: 'nodejs' | 'edge' // Runtime the route is built for
  assets: Record<string, string>  // Traced dependencies (key: relative path from repo root, value: absolute path)
  wasmAssets?: Record<string, string>  // Bundled wasm files (key: name, value: absolute path)
  edgeRuntime?: {
    modulePath: string    // Absolute path to the module registered in the edge runtime
    entryKey: string      // Canonical key used by the edge entry registry
    handlerExport: string // Export name to invoke, currently 'handler'
  }
  config: {
    maxDuration?: number  // Maximum duration of the route in seconds
    preferredRegion?: string | string[]  // Preferred deployment region
    env?: Record<string, string>  // Environment variables (edge runtime only)
    matchers?: Array<{
      source: string  // Source pattern
      sourceRegex: string  // Compiled regex for matching requests
      has: RouteHas[] | undefined  // Positive matching conditions
      missing: RouteHas[] | undefined  // Negative matching conditions
    }>
  }
}

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