manually join paths instead of using the os sep (#365)

* manually join paths instead of using the os sep

* add changelog

changelog.txt

@@ -0,0 +1 @@
+- Fixes issue with path resolution on Windows.

src/utils/pathutils.ts

@@ -19,16 +19,17 @@
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
-import { join } from "node:path";
-
 const INDEX_FILE = "index.html";
 
 /**
  * @param pathname path to check.
  * @return the path with "/index.html" appended, if required.
  */
 export function asDirectoryIndex(pathname: string): string {
-  return isDirectoryIndex(pathname) ? pathname : join(pathname, INDEX_FILE);
+  if (isDirectoryIndex(pathname)) {
+    return pathname;
+  }
+  return normalizeMultiSlashes(`${pathname}/${INDEX_FILE}`);
 }
 
 /**

test/unit/providers/fs.spec.ts

@@ -57,7 +57,7 @@ describe("provider: fs", () => {
     await fsp(opts)({}, "/index.html")
       .then(readStatStream)
       .then((body: string) => {
-        expect(body).to.eq("A\n");
+        expect(body.trim()).to.eq("A");
       });
   });
 
@@ -86,13 +86,13 @@ describe("provider: fs", () => {
       await fsp(opts)({}, "/index.html")
         .then(readStatStream)
         .then((body: string) => {
-          expect(body).to.eq("A\n");
+          expect(body.trim()).to.eq("A");
         });
 
       await fsp(opts)({}, "/b.html")
         .then(readStatStream)
         .then((body: string) => {
-          expect(body).to.eq("B\n");
+          expect(body.trim()).to.eq("B");
         });
     });