FileSystemRouter backslash bug on Windows

[ghost]

What version of Bun is running?

1.0.26-canary.106+fcf004776

What platform is your computer?

Microsoft Windows NT 10.0.22000.0 x64

What steps can reproduce the bug?

const router = new Bun.FileSystemRouter({
    dir: "./app",
    style: "nextjs",
    assetPrefix: "_assets/",
    fileExtensions: [".scss", ".css", ".js", ".ts", ".tsx", ".html", ".njk"],
  });

console.log(router.routes) /*
              Windows backslash kicks in...
        {
            "/\\": "D:\\Projs\\teste\\app\\index.html",
            "/\\filt\\/nest": "D:\\Projs\\teste\\app\\filt\\nest.ts",
            "/\\templates\\/test.html": "D:\\Projs\\teste\\app\\templates\\test.html.njk",
            "/\\/_index": "D:\\Projs\\teste\\app\\_index.ts",
            "/\\[test]\\rott\\/e": "D:\\Projs\\teste\\app\\[test]\\rott\\e.ts",
            "/\\[test]\\/indes": "D:\\Projs\\teste\\app\\[test]\\indes.ts",
            "/\\filt\\/[...aaaa]": "D:\\Projs\\teste\\app\\filt\\[...aaaa].ts",
            "/\\filt\\/[...slug]": "D:\\Projs\\teste\\app\\filt\\[...slug].ts",
            "/\\filt\\/[...zug]": "D:\\Projs\\teste\\app\\filt\\[...zug].ts",
        }
    */

What is the expected behavior?

router.match('/') /*
    MatchedRoute {
        filePath: "D:\\Projs\\teste\\app\\index.html",
        kind: "exact",
        name: "/",
        params: {},
        pathname: "/",
        query: {},
        scriptSrc: "index.html",
        src: "index.html",
    }
  */

What do you see instead?

router.match('/') // null

router.match('/\\') // MatchedRoute { ... }

Additional information

I was able to make a workaround, it´s ugly but it works:

  if (platform() == "win32") {
    const brokenMatcher = router.match.bind(router);

    router.match = function (input) {
      const url = new URL(typeof input == 'string' ? input : input.url);

      return brokenMatcher(
        url.pathname // use URL.pathname to remove the query, as it also gets "corrupted"
          .replaceAll(/\/(\w*)\/?/g, "/\\$1\\/") // remove any backslash along the string
          .replace(/(\w*)\\\/$/, "/$1") // remove trailing backslash
      );
    };
  }

#wind

[dylan-conway]

this is fixed in #8644 . The bugfix will be available in 1.0.26