For this code:

// middleware.ts

const PATHS = new Set([
  "some", 
  "path", 
  "weneed", 
  "to", 
  "match", 

]);

export function middleware(request: NextRequest) {
  
  if(PATHS.has(request.nextUrl.pathname)) {
    return NextResponse.redirect("/somewhere");
  }



  return NextResponse.next(); 
}

Are the elements defined outside the middleware function (like PATHS) recreated on every request, or are they initialized once and reused across requests?