fix: don't add unnecessary trailing slashes

Author: tristan-f-r

.gitignore

@@ -1 +1 @@
-deno.lock # this is a deno library
+deno.lock

README.md

@@ -15,7 +15,8 @@ Or, add it to your deno.json's (or deno.jsonc) tasks:
 You can even add a github action:
 https://github.com/LeoDog896/deno-outdated/blob/main/.github/workflows/update.yml
 
-Do note that if you're running an application, remove the run action that removes deno.lock `rm deno.lock`, as that is only for libraries
+Do note that if you're running an application, remove the run action that
+removes deno.lock `rm deno.lock`, as that is only for libraries
 
 ## Flags
 

redirect.ts

@@ -8,7 +8,8 @@ export async function checkRedirect(url: string): Promise<string | undefined> {
   await response.body?.cancel();
 
   if (response.redirected) {
-    return response.url + (url.endsWith("/") ? "/" : "");
+    return response.url +
+      (url.endsWith("/") && !response.url.endsWith("/") ? "/" : "");
   } else {
     return undefined;
   }

test/change.test.ts

@@ -41,6 +41,12 @@ Deno.test("Slash at the end of a URL isn't removed", async () => {
   const source = `https://esm.sh/preact@10.10.6/`; // i-deno-outdated
   const result = await findAndReplace(source);
 
+  // https://github.com/LeoDog896/deno-outdated/issues/18
+  assert(
+    !result.endsWith("//"),
+    "Result ends with two slashes '//': " + result,
+  );
+
   assert(
     result.endsWith("/"),
     "Result doesn't end with '/': " + result,