fix: abstract and fix legacy fs (#4032)

src/errors.ts

@@ -1,4 +1,5 @@
 type CANVAS_ERROR_NAMES = "CANVAS_ERROR" | "CANVAS_POSSIBLY_TOO_BIG";
+
 export class CanvasError extends Error {
   constructor(
     message: string = "Couldn't export canvas.",
@@ -9,3 +10,9 @@ export class CanvasError extends Error {
     this.message = message;
   }
 }
+
+export class AbortError extends DOMException {
+  constructor(message: string = "Request Aborted") {
+    super(message, "AbortError");
+  }
+}