narrow down roughness type

src/element/types.ts

@@ -21,7 +21,7 @@ type _ExcalidrawElementBase = Readonly<{
   strokeWidth: number;
   strokeStyle: StrokeStyle;
   strokeSharpness: StrokeSharpness;
-  roughness: number;
+  roughness: 0 | 1 | 2;
   opacity: number;
   width: number;
   height: number;

src/types.ts

@@ -55,7 +55,7 @@ export type AppState = {
   currentItemFillStyle: ExcalidrawElement["fillStyle"];
   currentItemStrokeWidth: number;
   currentItemStrokeStyle: ExcalidrawElement["strokeStyle"];
-  currentItemRoughness: number;
+  currentItemRoughness: ExcalidrawElement["roughness"];
   currentItemOpacity: number;
   currentItemFontFamily: FontFamily;
   currentItemFontSize: number;