next.js

81f5ed7a - Fix: Router.query contains _next when using middleware with dynamic routes (#48753)

Fix: Router.query contains _next when using middleware with dynamic routes (#48753) Fixes: #43598 This was a tricky one to find! Not sure why more people aren't complaining about this issue, was super annoying in my use case since links had the wrong URL. ## What? This issue only occurred when basepath was defined and middleware and dynamic pages are being used. Example from the reproduction repo mentioned in the issue tagged: <img width="686" alt="Screenshot 2023-04-23 at 9 32 55 PM" src="https://user-images.githubusercontent.com/11258286/233850968-e14f6b49-858b-410e-b8f9-93c90447090a.png"> ## Why? `nextConfig` wasn't passed to `getNextPathnameInfo` function, hence the basePath wasn't removed from a intermediate variable and that trickled down to cause this issue. Added test case based on the issue reproduction repo --------- Co-authored-by: Jimmy Lai <laijimmy0@gmail.com>