Refactor signal and effect functions for clarity

New fetch, storage, web sockets,

sigpro.js

@@ -101,7 +101,7 @@ export const $ = (initialValue) => {
  * @param {Function} effectFn - The effect function to run
  * @returns {Function} Cleanup function to stop the effect
  */
-export const $$ = (effectFn) => {
+export const $effect = (effectFn) => {
   const effect = {
     dependencies: new Set(),
     cleanupHandlers: new Set(),
@@ -135,6 +135,31 @@ export const $$ = (effectFn) => {
   return () => effect.stop();
 };
 
+/**
+ * Persistent signal with localStorage
+ * @param {string} key - Storage key
+ * @param {any} initialValue - Default value if none stored
+ * @param {Storage} [storage=localStorage] - Storage type (localStorage/sessionStorage)
+ * @returns {Function} Signal that persists to storage
+ */
+export const $$ = (key, initialValue, storage = localStorage) => {
+  // Load saved value
+  const saved = storage.getItem(key);
+  const signal = $(saved !== null ? JSON.parse(saved) : initialValue);
+
+  // Auto-save on changes
+  $effect(() => {
+    const value = signal();
+    if (value === undefined || value === null) {
+      storage.removeItem(key);
+    } else {
+      storage.setItem(key, JSON.stringify(value));
+    }
+  });
+
+  return signal;
+};
+
 /**
  * Tagged template literal for creating reactive HTML
  * @param {string[]} strings - Template strings
@@ -150,8 +175,7 @@ export const html = (strings, ...values) => {
    * @param {number[]} path - Path indices
    * @returns {Node} Target node
    */
-  const getNodeByPath = (root, path) => 
+  const getNodeByPath = (root, path) => path.reduce((node, index) => node?.childNodes?.[index], root);
-    path.reduce((node, index) => node?.childNodes?.[index], root);
 
   /**
    * Applies reactive text content to a node
@@ -173,7 +197,7 @@ export const html = (strings, ...values) => {
         parent.insertBefore(endMarker, node);
 
         let lastResult;
-        $$(() => {
+        $effect(() => {
           let result = typeof currentValue === "function" ? currentValue() : currentValue;
           if (result === lastResult) return;
           lastResult = result;
@@ -183,20 +207,18 @@ export const html = (strings, ...values) => {
             if (textNode !== endMarker && textNode?.nodeType === 3) {
               textNode.textContent = result ?? "";
             } else {
-              while (startMarker.nextSibling !== endMarker) 
+              while (startMarker.nextSibling !== endMarker) parent.removeChild(startMarker.nextSibling);
-                parent.removeChild(startMarker.nextSibling);
               parent.insertBefore(document.createTextNode(result ?? ""), endMarker);
             }
             return;
           }
 
           // Handle arrays or objects
-          while (startMarker.nextSibling !== endMarker) 
+          while (startMarker.nextSibling !== endMarker) parent.removeChild(startMarker.nextSibling);
-            parent.removeChild(startMarker.nextSibling);
 
           const items = Array.isArray(result) ? result : [result];
           const fragment = document.createDocumentFragment();
-          items.forEach(item => {
+          items.forEach((item) => {
             if (item == null || item === false) return;
             const nodeItem = item instanceof Node ? item : document.createTextNode(item);
             fragment.appendChild(nodeItem);
@@ -226,8 +248,7 @@ export const html = (strings, ...values) => {
       const path = [];
       while (node && node !== template.content) {
         let index = 0;
-        for (let sibling = node.previousSibling; sibling; sibling = sibling.previousSibling) 
+        for (let sibling = node.previousSibling; sibling; sibling = sibling.previousSibling) index++;
-          index++;
         path.push(index);
         node = node.parentNode;
       }
@@ -240,10 +261,11 @@ export const html = (strings, ...values) => {
       const nodeInfo = {
         type: currentNode.nodeType,
         path: getNodePath(currentNode),
-        parts: [] 
+        parts: [],
       };
 
-      if (currentNode.nodeType === 1) { // Element node
+      if (currentNode.nodeType === 1) {
+        // Element node
         for (let i = 0; i < currentNode.attributes.length; i++) {
           const attribute = currentNode.attributes[i];
           if (attribute.value.includes("{{part}}")) {
@@ -268,27 +290,58 @@ export const html = (strings, ...values) => {
   // Get target nodes before applyTextContent modifies the DOM
   const targets = cachedTemplate.dynamicNodes.map((nodeInfo) => ({
     node: getNodeByPath(fragment, nodeInfo.path),
-    info: nodeInfo
+    info: nodeInfo,
   }));
 
   targets.forEach(({ node, info }) => {
     if (!node) return;
 
-    if (info.type === 1) { // Element node
+    if (info.type === 1) {
+      // Element node
       info.parts.forEach((part) => {
         const currentValue = values[valueIndex++];
         const attributeName = part.name;
         const firstChar = attributeName[0];
 
         if (firstChar === "@") {
-          // Event listener
+          const [eventName, ...modifiers] = attributeName.slice(1).split(".");
-          node.addEventListener(attributeName.slice(1), currentValue);
+
+          const handlerWrapper = (e) => {
+            if (modifiers.includes("prevent")) e.preventDefault();
+            if (modifiers.includes("stop")) e.stopPropagation();
+            if (modifiers.includes("self") && e.target !== node) return;
+
+            // Debounce
+            if (modifiers.some((m) => m.startsWith("debounce"))) {
+              const ms = modifiers.find((m) => m.startsWith("debounce"))?.split(":")[1] || 300;
+              clearTimeout(node._debounceTimer);
+              node._debounceTimer = setTimeout(() => currentValue(e), ms);
+              return;
+            }
+
+            // Once (auto-remover)
+            if (modifiers.includes("once")) {
+              node.removeEventListener(eventName, handlerWrapper);
+            }
+
+            currentValue(e);
+          };
+
+          node.addEventListener(eventName, handlerWrapper, {
+            passive: modifiers.includes("passive"),
+            capture: modifiers.includes("capture"),
+          });
+
+          // Cleanup
+          if ($effect.onCleanup) {
+            $effect.onCleanup(() => node.removeEventListener(eventName, handlerWrapper));
+          }
         } else if (firstChar === ":") {
           // Two-way binding
           const propertyName = attributeName.slice(1);
           const eventType = node.type === "checkbox" || node.type === "radio" ? "change" : "input";
 
-          $$(() => {
+          $effect(() => {
             const value = typeof currentValue === "function" ? currentValue() : currentValue;
             if (node[propertyName] !== value) node[propertyName] = value;
           });
@@ -300,14 +353,14 @@ export const html = (strings, ...values) => {
         } else if (firstChar === "?") {
           // Boolean attribute
           const attrName = attributeName.slice(1);
-          $$(() => {
+          $effect(() => {
             const result = typeof currentValue === "function" ? currentValue() : currentValue;
             node.toggleAttribute(attrName, !!result);
           });
         } else if (firstChar === ".") {
           // Property binding
           const propertyName = attributeName.slice(1);
-          $$(() => {
+          $effect(() => {
             let result = typeof currentValue === "function" ? currentValue() : currentValue;
             node[propertyName] = result;
             if (result != null && typeof result !== "object" && typeof result !== "boolean") {
@@ -317,13 +370,14 @@ export const html = (strings, ...values) => {
         } else {
           // Regular attribute
           if (typeof currentValue === "function") {
-            $$(() => node.setAttribute(attributeName, currentValue()));
+            $effect(() => node.setAttribute(attributeName, currentValue()));
           } else {
             node.setAttribute(attributeName, currentValue);
           }
         }
       });
-    } else if (info.type === 3) { // Text node
+    } else if (info.type === 3) {
+      // Text node
       const placeholderCount = node.textContent.split("{{part}}").length - 1;
       applyTextContent(node, values.slice(valueIndex, valueIndex + placeholderCount));
       valueIndex += placeholderCount;
@@ -403,6 +457,30 @@ export const $component = (tagName, setupFunction, observedAttributes = []) => {
   );
 };
 
+/**
+ * Ultra-simple fetch wrapper with optional loading signal
+ * @param {string} url - Endpoint URL
+ * @param {Object} data - Data to send (automatically JSON.stringify'd)
+ * @param {Function} [loading] - Optional signal function to track loading state
+ * @returns {Promise<Object|null>} Parsed JSON response or null on error
+ */
+export const $fetch = async (url, data, loading) => {
+  if (loading) loading(true);
+
+  try {
+    const res = await fetch(url, {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify(data),
+    });
+    return await res.json();
+  } catch (e) {
+    return null;
+  } finally {
+    if (loading) loading(false);
+  }
+};
+
 /**
  * Creates a router for hash-based navigation
  * @param {Array<{path: string|RegExp, component: Function}>} routes - Route configurations
@@ -424,7 +502,7 @@ export const $router = (routes) => {
     if (currentPath() !== nextPath) currentPath(nextPath);
   });
 
-  $$(() => {
+  $effect(() => {
     const path = currentPath();
     let matchedRoute = null;
     let routeParams = {};
@@ -453,9 +531,7 @@ export const $router = (routes) => {
             <h1>404</h1>
           `;
 
-      container.replaceChildren(
+      container.replaceChildren(view instanceof Node ? view : document.createTextNode(view ?? ""));
-        view instanceof Node ? view : document.createTextNode(view ?? "")
-      );
     } finally {
       activeEffect = previousEffect;
     }
@@ -472,3 +548,76 @@ $router.go = (path) => {
   const targetPath = path.startsWith("/") ? path : `/${path}`;
   if (window.location.hash !== `#${targetPath}`) window.location.hash = targetPath;
 };
+
+/**
+ * Simple WebSocket wrapper with signals
+ * @param {string} url - WebSocket URL
+ * @param {Object} options - Auto-reconnect options
+ * @returns {Object} WebSocket with reactive signals
+ */
+export const $ws = (url, options = {}) => {
+  const {
+    reconnect = true,
+    maxReconnect = 5,
+    reconnectInterval = 1000
+  } = options;
+
+  const status = $('disconnected');
+  const messages = $([]);
+  const error = $(null);
+  
+  let ws = null;
+  let reconnectAttempts = 0;
+  let reconnectTimer = null;
+
+  const connect = () => {
+    status('connecting');
+    ws = new WebSocket(url);
+    
+    ws.onopen = () => {
+      status('connected');
+      reconnectAttempts = 0;
+      error(null);
+    };
+    
+    ws.onmessage = (e) => {
+      messages([...messages(), e.data]);
+    };
+    
+    ws.onerror = (err) => {
+      error(err);
+      status('error');
+    };
+    
+    ws.onclose = () => {
+      status('disconnected');
+      
+      if (reconnect && reconnectAttempts < maxReconnect) {
+        reconnectTimer = setTimeout(() => {
+          reconnectAttempts++;
+          connect();
+        }, reconnectInterval * Math.pow(2, reconnectAttempts));
+      }
+    };
+  };
+
+  const send = (data) => {
+    if (ws?.readyState === WebSocket.OPEN) {
+      ws.send(typeof data === 'string' ? data : JSON.stringify(data));
+    }
+  };
+
+  const close = () => {
+    if (reconnectTimer) clearTimeout(reconnectTimer);
+    if (ws) {
+      ws.close();
+      ws = null;
+    }
+  };
+
+  connect();
+
+  if ($effect?.onCleanup) $e.onCleanup(close);
+
+  return { status, messages, error, send, close };
+};