Refactor image reference.

catalog/catalog-image/catalog-image-type/index.ts

@@ -0,0 +1 @@
+export type CatalogImageType = `pixelArt`;

catalog/catalog-image/index.ts

@@ -0,0 +1,16 @@
+import { CatalogImageType } from "./catalog-image-type";
+
+export { CatalogImageType } from "./catalog-image-type";
+
+export type CatalogImage = {
+  /**
+   * The second half of the URL for the image.  Must refer to an existing PNG or
+   * JPEG.
+   */
+  readonly urlSuffix: string;
+
+  /**
+   * The type of image content.
+   */
+  readonly type: CatalogImageType;
+};

catalog/catalog-localization/index.ts

@@ -1,3 +1,5 @@
+import { CatalogImage } from "../catalog-image";
+
 /**
  * A localization of a catalog.
  */
@@ -14,8 +16,8 @@ export type CatalogLocalization = {
   readonly uiName: string;
 
   /**
-   * The second half of the URL for the localization's icon.  Must refer to an
-   * existing PNG or JPEG.
+   * The square icon used to represent the localization.  May be cropped to a
+   * circle.
    */
-  readonly iconUrlSuffix: string;
+  readonly icon: CatalogImage;
 };

catalog/index.ts

@@ -7,6 +7,8 @@ export {
   CatalogGame,
 } from "./catalog-game";
 
+export { CatalogImage } from "./catalog-image";
+
 export { CatalogLocalization } from "./catalog-localization";
 
 /**