From cc7725388b566bcfa7f65453dfe051d828a1b13f Mon Sep 17 00:00:00 2001
From: AuDevTist1C <114492072+AuDevTist1C@users.noreply.github.com>
Date: Thu, 20 Aug 2026 11:02:42 +0200
Subject: [PATCH] perf(file-browser): Convert directory cache to `Map` instance

Replace the plain object container used for cached directories with an ES6 `Map` to improve key lookup operations and key management semantics.

Update cached directory data structure (`src/pages/fileBrowser/fileBrowser.js`):
- Re-initialize `cachedDir` variable as a `Map`
- Replace object property lookups with `Map.prototype.has()` and `Map.prototype.get()`
- Update cache writes to use `Map.prototype.set()`
- Update directory deletion calls to use `Map.prototype.delete()`

(AI generated commit message)
---
 src/pages/fileBrowser/fileBrowser.js | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/src/pages/fileBrowser/fileBrowser.js b/src/pages/fileBrowser/fileBrowser.js
index ef9c59ce2..dcb53c489 100644
--- a/src/pages/fileBrowser/fileBrowser.js
+++ b/src/pages/fileBrowser/fileBrowser.js
@@ -171,7 +171,7 @@ function FileBrowserInclude(mode, info, doesOpenLast = true) {
 		$selectionMenuToggler.style.display = "none";
 		$pasteToggler.style.display = "none";
 		const progress = {};
-		let cachedDir = {};
+		let cachedDir = new Map();
 		let currentDir = {
 			url: null,
 			name: null,
@@ -255,8 +255,6 @@ function FileBrowserInclude(mode, info, doesOpenLast = true) {
 			}
 
 			if (action === "reload") {
-				const { url } = currentDir;
-				if (url in cachedDir) delete cachedDir[url];
 				reload();
 				return;
 			}
@@ -731,7 +729,7 @@ function FileBrowserInclude(mode, info, doesOpenLast = true) {
 			}
 			recents.removeFile(url);
 			openFolder.removeItem(url);
-			delete cachedDir[url];
+			cachedDir.delete(url);
 		}
 
 		function updateSelectionCount($count) {
@@ -1471,8 +1469,8 @@ function FileBrowserInclude(mode, info, doesOpenLast = true) {
 			let list = [];
 			let error = false;
 
-			if (url in cachedDir) {
-				return cachedDir[url];
+			if (cachedDir.has(url)) {
+				return cachedDir.get(url);
 			} else {
 				if (url === "/") {
 					list = await listAllStorages();
@@ -1807,8 +1805,8 @@ function FileBrowserInclude(mode, info, doesOpenLast = true) {
 			const $oldList = $content.get("#list");
 			if ($oldList) {
 				const { url } = currentDir;
-				if (url && cachedDir[url]) {
-					cachedDir[url].scroll = $oldList.scrollTop;
+				if (url && cachedDir.has(url)) {
+					cachedDir.get(url).scroll = $oldList.scrollTop;
 				}
 				$oldList.remove();
 			}
@@ -1817,13 +1815,13 @@ function FileBrowserInclude(mode, info, doesOpenLast = true) {
 			$list.focus();
 
 			currentDir = dir;
-			cachedDir[dir.url] = dir;
+			cachedDir.set(dir.url, dir);
 			updatePasteToggler();
 		}
 
 		function reload() {
 			const { url, name } = currentDir;
-			delete cachedDir[url];
+			cachedDir.delete(url);
 			navigate(url, name);
 		}