[TS] Declare missing types in BaseWidget (#1038)

src/widgets/BaseWidget.ts

@@ -42,6 +42,13 @@ export abstract class BaseWidget<TWidget extends IBaseWidget = IBaseWidget> impl
   static labelValueGap = 5
 
   declare computedHeight?: number
+  declare serialize?: boolean
+  computeLayoutSize?(node: LGraphNode): {
+    minHeight: number
+    maxHeight?: number
+    minWidth: number
+    maxWidth?: number
+  }
 
   #node: LGraphNode
   /** The node that this widget belongs to. */

src/widgets/KnobWidget.ts

@@ -12,7 +12,7 @@ export class KnobWidget extends BaseWidget<IKnobWidget> implements IKnobWidget {
    * Compute the layout size of the widget.
    * @returns The layout size of the widget.
    */
-  computeLayoutSize(): {
+  override computeLayoutSize(): {
     minHeight: number
     maxHeight?: number
     minWidth: number

src/widgets/LegacyWidget.ts

@@ -23,8 +23,7 @@ export class LegacyWidget<TWidget extends IBaseWidget = IBaseWidget> extends Bas
 
   override drawWidget(ctx: CanvasRenderingContext2D, options: DrawWidgetOptions) {
     const H = LiteGraph.NODE_WIDGET_HEIGHT
-    const thisAsICustomWidget = this
-    thisAsICustomWidget.draw?.(ctx, this.node, options.width, this.y, H, !!options.showText)
+    this.draw?.(ctx, this.node, options.width, this.y, H, !!options.showText)
   }
 
   override onClick() {