[guess-parser] Is not support Nextjs?

Expect behavior

• Configure guess.js configuration using by guess-webpack and guess-parser
• run next build
• guess.js works well

Actual behavior

When we run next build, we’ll get this error.

$ next build && next export
(node:57565) UnhandledPromiseRejectionWarning: Error: Cannot detect the application type
    at exports.parseRoutes (/Users/development/next-app/node_modules/guess-parser/dist/guess-parser/index.js:860:15)

Issue

I’ve checked the code, I think the guess-parser does not support nextjs.

https://github.com/guess-js/guess/blob/3c55310899f601aeedfa483db571de905b6c8797/packages/guess-parser/src/detector/detect.ts

Is it possible to support Nextjs?

I think we need the following conditions, isn’t it?

  if (d('react') && d('next') {
    return { ...ANY_CONFIG };
  }
  if (d('react') && d('next') && exists('tsconfig.json')) {
    return { ...ANY_CONFIG };
  }

Thanks.

[mgechev]

Yes, you are correct. The parser does not support Next.js which means that you can’t take advantage of the ahead of time prefetching of Guess.js. At the same time, you can embed the prefetching instructions for your entire application as part of your main bundle. This way you can enable predictive prefetching for your Next.js app.

[mgechev]

You can find a demo with Next.js here https://github.com/mgechev/guess-next.