perf: improvements using Promise.all() (#3683)

Co-authored-by: Asher Gomez <ashersaupingomez@gmail.com>

fs/copy.ts

@@ -190,17 +190,21 @@ async function copyDir(
   src = toPathString(src);
   dest = toPathString(dest);
 
+  const promises = [];
+
   for await (const entry of Deno.readDir(src)) {
     const srcPath = join(src, entry.name);
     const destPath = join(dest, basename(srcPath as string));
     if (entry.isSymlink) {
-      await copySymLink(srcPath, destPath, options);
+      promises.push(copySymLink(srcPath, destPath, options));
     } else if (entry.isDirectory) {
-      await copyDir(srcPath, destPath, options);
+      promises.push(copyDir(srcPath, destPath, options));
     } else if (entry.isFile) {
-      await copyFile(srcPath, destPath, options);
+      promises.push(copyFile(srcPath, destPath, options));
     }
   }
+
+  await Promise.all(promises);
 }
 
 /* copy folder from src to dest synchronously */

fs/empty_dir.ts

@@ -23,13 +23,12 @@ export async function emptyDir(dir: string | URL) {
       items.push(dirEntry);
     }
 
-    while (items.length) {
-      const item = items.shift();
+    await Promise.all(items.map((item) => {
       if (item && item.name) {
         const filepath = join(toPathString(dir), item.name);
-        await Deno.remove(filepath, { recursive: true });
+        return Deno.remove(filepath, { recursive: true });
       }
-    }
+    }));
   } catch (err) {
     if (!(err instanceof Deno.errors.NotFound)) {
       throw err;

http/cookie_map.ts

@@ -607,9 +607,11 @@ export class SecureCookieMap extends CookieMapBase {
   /** Sets all cookies in the {@linkcode Request} to be deleted in the
    * response. */
   async clear(options: SecureCookieMapSetDeleteOptions) {
+    const promises = [];
     for await (const key of this.keys()) {
-      await this.set(key, null, options);
+      promises.push(this.set(key, null, options));
     }
+    await Promise.all(promises);
   }
 
   /** Set a cookie to be deleted in the response.