Show error message when canvas to export is too big (#1256) (#2210)

Co-authored-by: dwelle <luzar.david@gmail.com>

src/errors.ts

@@ -0,0 +1,11 @@
+type CANVAS_ERROR_NAMES = "CANVAS_ERROR" | "CANVAS_POSSIBLY_TOO_BIG";
+export class CanvasError extends Error {
+  constructor(
+    message: string = "Couldn't export canvas.",
+    name: CANVAS_ERROR_NAMES = "CANVAS_ERROR",
+  ) {
+    super();
+    this.name = name;
+    this.message = message;
+  }
+}