Unable to parse config export in source file about next.js

[timneutkens]

We've opened a fix here: #64678

[Gawdfrey]

I bumped into this issue after upgrading to v14.2 just now. I have almost the exact same config as OP.
I guess this makes it so that the matcher is not respected and it applies to all routes? 🤔

[jenewland1999]

+1, have the exact same issue with same config too. Seems to be a 14.2 specific thing.

[balazsorban44]

It looks like the parsing is incomplete at:

next.js/packages/next-swc/crates/next-core/src/util.rs

Lines 375 to 387 in 6a1e70a

	JsValue::Array { items, .. } => {
	for item in items {
	if let Some(matcher) = item.as_str() {
	matchers.push(matcher.to_string());
	} else {
	invalid_config(
	"The matcher property must be a string or array \
	of strings",
	value,
	);
	}
	}
	}

🤔 It should also allow objects as an item of the matchers array.

[ivandamyanov]

I get the same issue when turning on --turbo with nextjs 14.2.1 with this matcher:

[
    {
      source: '/((?!api|_next/static|_next/image|__nextjs|.*\\..*|favicon.ico|auth/).*)',
      missing: [
        { type: 'header', key: 'next-router-prefetch' },
        { type: 'header', key: 'purpose', value: 'prefetch' },
      ],
    },
]

[biohackerellie]

+1, have the exact same issue, exact same config

export const config = {
  matcher: [
    {
      source: "/((?!api|_next/static|_next/image|favicon.ico).*)",
      missing: [
        { type: "header", key: "next-router-prefetch" },
        { type: "header", key: "purpose", value: "prefetch" },
      ],
    },
  ],
};

Unable to parse config export in source file 
The exported configuration object in a source file need to have a very specific format from which some properties can be statically parsed at compiled-time.

[kamalciirs]

Can you please check the issue reproduce example link is unavailable.

[r34son]

Can you please check the issue reproduce example link is unavailable.

Updated link

[mwawrusch]

export const config = {
  matcher: [
    /*
     * Match all request paths except for the ones starting with:
     * - api (API routes)
     * - _next/static (static files)
     * - _next/image (image optimization files)
     * - favicon.ico (favicon file)
     */
    {
      source: '/((?!api|_next/static|_next/image|favicon.ico).*)',
      missing: [
        { type: 'header', key: 'next-router-prefetch' },
        { type: 'header', key: 'purpose', value: 'prefetch' },
      ],
    },
  ],
}

14.2.1

[mwawrusch]

As always you guys rock. Thank you

[jenewland1999]

Thanks @timneutkens and team! Appreciate the fix!