[Refactor] Update Litegraph widget types / cleanup (#3782)

src/composables/widgets/useComboWidget.ts

@@ -71,10 +71,12 @@ const addComboWidget = (node: LGraphNode, inputSpec: ComboInputSpec) => {
     if (inputSpec.remote.refresh_button) remoteWidget.addRefreshButton()
 
     const origOptions = widget.options
-    widget.options = new Proxy(origOptions as Record<string | symbol, any>, {
-      get(target, prop: string | symbol) {
-        if (prop !== 'values') return target[prop]
-        return remoteWidget.getValue()
+    widget.options = new Proxy(origOptions, {
+      get(target, prop) {
+        // Assertion: Proxy handler passthrough
+        return prop !== 'values'
+          ? target[prop as keyof typeof target]
+          : remoteWidget.getValue()
       }
     })
   }

src/composables/widgets/useImagePreviewWidget.ts

@@ -237,14 +237,14 @@ const renderPreview = (
 class ImagePreviewWidget implements ICustomWidget {
   readonly type: 'custom'
   readonly name: string
-  readonly options: IWidgetOptions<unknown>
+  readonly options: IWidgetOptions<string | object>
   /** Dummy value to satisfy type requirements. */
   value: string
   y: number = 0
   /** Don't serialize the widget value. */
   serialize: boolean = false
 
-  constructor(name: string, options: IWidgetOptions<unknown>) {
+  constructor(name: string, options: IWidgetOptions<string | object>) {
     this.type = 'custom'
     this.name = name
     this.options = options