outputFileTracingIncludes in app directory routes

[theAJFM]

Hi,

I've yet to figure out a way to force files to be included in the output file tracing for a given path. In the page directory, I was able to do something like this:

outputFileTracingIncludes: {
  '/api/post': ['.next/server/chunks/*.wasm'],
},

In the app directory, doing something like this in the new API route handler doesn't work:

outputFileTracingIncludes: {
  '/api/post/route': ['.next/server/chunks/*.wasm'],
},

I used /api/post/route since it's the name of the file that was traced, and after looking into its nft.json file, the wasm files never appeared.

From looking at the Next.js source code, I get a sense that this is a feature that's only available in the pages directory:

const traceFile = path.join(
  distDir,
  'server/pages', // This is the parent folder for all of the page route pages and api routes alike in the build output. App dir page files are placed elsewhere.
  `${page}.js.nft.json`
)

Is it true that this is only available in pages directory? Any plan to enable this in the app directory as well?

[sgoodrow-zymergen]

+1

[vinnymac]

It has been a year, and I was able to get this working after some trial/error.
I am using NextJS 14.2.15 and Turborepo 2.0.5, and my config looks like

const config = {
  experimental: {
    outputFileTracingIncludes: {
      '/api/nft': ['./src/asset/path/*'],
    },
  },
};

I tried /api/nft/* and /api/nft/route as well, and neither of those worked. I confirmed each of my attempts by going to .next/server/app/nft/route.js.nft.json and verifying whether or not they included src/asset/path files. Only /api/nft produced the appropriate traces.

https://nextjs.org/docs/app/api-reference/next-config-js/output#how-it-works

Note: The vercel.json functions includeFiles docs did not work for me, whether or not I was using vercel to host my NextJS app.

Further, the project I was working on had another issue where a fileURLToPath(import.meta.url) was used, switching to process.cwd() fixed it, despite ESM working just fine locally.