support embedding scene data to PNG/SVG (#2219)

Co-authored-by: Lipis <lipiridis@gmail.com>

src/constants.ts

@@ -84,3 +84,8 @@ export const CANVAS_ONLY_ACTIONS = ["selectAll"];
 export const GRID_SIZE = 20; // TODO make it configurable?
 
 export const LOCAL_STORAGE_KEY_COLLAB_FORCE_FLAG = "collabLinkForceLoadFlag";
+
+export const MIME_TYPES = {
+  excalidraw: "application/vnd.excalidraw+json",
+  excalidrawlib: "application/vnd.excalidrawlib+json",
+};