redirects don't work properly with i18n and basepath

**What version of Next.js are you using?** 10.0.5 **What version of Node.js are you using?** 12.16.1 **What browser are you using?** Chrome **What operating system are you using?** Windows **How are you deploying your application?** docker / k8s **Describe the Bug** I'm developing a `nextjs` app that should be deployed at `/my-base-path`. I wanted to redirect `/` to `/my-base-path`, and I setup `next.config.js` accordingly: ```js const basePath = '/my-base-path'; const nextConfig = { basePath, env: { BASE_PATH: basePath, }, redirects: async () => ([ { source: '/', destination: basePath, permanent: false, basePath: false, }, ]) }; module.exports = nextConfig; ``` Everything works as expected: `/` redirects to `/my-base-path`. Once I add an `i18n` config to `nextConfig`, redirects don't function as I expect: ```js const basePath = '/my-base-path'; const nextConfig = { basePath, env: { BASE_PATH: basePath, }, i18n: { defaultLocale: 'en', locales: ['en', 'es'], }, redirects: async () => ([ { source: '/', destination: basePath, permanent: false, basePath: false, }, ]) }; module.exports = nextConfig; ``` **Expected Behavior** - `/` should redirect to `/my-base-path`, but `/` just returns a 404. - `/en` redirects to `/en/my-base-path`, and `/en/my-base-path` returns a 404. - `/my-base-path/en` renders the welcome page, but I would expect it to redirect to `/my-base-path`. - `/my-base-path` renders the welcome page as expected. 👍 **To Reproduce** A repo demonstrating this behavior exists at https://github.com/ckeeney/nextjs-redirect-i18n-basepath It's unclear to me whether the correct path structure is `/{locale}/{basePath}/{page}` or `/{basePath}/{locale}/{page}`. I think the former would make a more consistent URL pattern across multiple zones, but I'm a bit nervo…