diff --git a/test_changer.mjs b/test_changer.mjs
index b03ae51..b638849 100644
--- a/test_changer.mjs
+++ b/test_changer.mjs
@@ -1,4 +1,4 @@
-export let changing = 42;
+export let changing = "hello!";
 
 ////////////////////////////////////////////
 let ReImported = {};
diff --git a/transpiler/walker.html b/transpiler/walker.html
new file mode 100644
index 0000000..3cecbe4
--- /dev/null
+++ b/transpiler/walker.html
@@ -0,0 +1,61 @@
+<html>
+<head></head>
+<body>
+<button id="open">open</button>
+<script type="module">
+// Function to walk through the directory and check files
+async function checkFiles(dirHandle, extension, date, path="", /** @type {Map<string, File>}*/map, /** @type {Map<string, File>}*/deleteList, /** @type {Array<{fullPath:string, file:File>}*/focusList) {
+    for await (const entry of dirHandle.values())
+    {
+        if (entry.kind === 'file' && entry.name.endsWith(extension))
+        {
+            const file = await entry.getFile();
+            const fullPath = path + entry.name;
+            map.set(fullPath, file);
+            deleteList.delete(fullPath);
+            if (file.lastModified > date)
+            {
+                focusList.push({file, fullPath});
+            }
+        } else if (entry.kind === 'directory')
+        {
+            await checkFiles(entry, extension, date, path+entry.name, map, deleteList, focusList); // Recursively check subdirectories
+        }
+    }
+}
+
+// Main function to set up the interval polling task
+async function main() {
+    const dirHandle = await window.showDirectoryPicker();
+    const extension = '.html'; // Change this to the desired file extension
+    let oldFiles = new Map();
+    let focusFiles = [];
+    let time = new Date().getTime();
+    const Loop =async()=>
+    {
+        console.log("checking");
+
+        focusFiles = [];
+        
+        /** @type {Map<string, File>} */
+        const newFiles = new Map();
+        await checkFiles(dirHandle, extension, time, undefined, newFiles, oldFiles, focusFiles);
+
+        // oldFiles now represent delete list
+        oldFiles.size && console.log("delete:", oldFiles);
+
+        // process updated files
+        focusFiles.length && console.log("update:", focusFiles);
+
+        // reset resources
+        oldFiles = newFiles;
+        time = new Date().getTime();
+
+        setTimeout(Loop, 3000);
+    }
+    Loop();
+}
+document.getElementById("open").addEventListener("click", main);
+</script>
+</body>
+</html>
\ No newline at end of file
