Add support for node/input/output tooltips (#287)

* Add support for node/input/output tooltips

* pr feedback

* Remove

src/scripts/domWidget.ts

@@ -226,11 +226,8 @@ LGraphCanvas.prototype.computeVisibleNodes = function (): LGraphNode[] {
     if (elementWidgets.has(node)) {
       const hidden = visibleNodes.indexOf(node) === -1
       for (const w of node.widgets) {
-        // @ts-expect-error
         if (w.element) {
-          // @ts-expect-error
           w.element.hidden = hidden
-          // @ts-expect-error
           w.element.style.display = hidden ? 'none' : undefined
           if (hidden) {
             w.options.onHide?.(w)
@@ -282,6 +279,13 @@ LGraphNode.prototype.addDOMWidget = function (
     document.addEventListener('mousedown', mouseDownHandler)
   }
 
+  const { nodeData } = this.constructor
+  const tooltip = (nodeData?.input.required?.[name] ??
+    nodeData?.input.optional?.[name])?.[1]?.tooltip
+  if (tooltip && !element.title) {
+    element.title = tooltip
+  }
+
   const widget: DOMWidget = {
     type,
     name,