export default class Check {
  constructor(check) {
    this.fun = check;
  }

  run(context, transition) {
    return this.fun.apply(context, transition);
  }
}

@@ -128,32 +128,33 @@
 .apply(context, 
+%5B
 transition);%0A  %7D
@@ -147,16 +147,17 @@
 ansition
+%5D
 );%0A  %7D%0A%7D

Fix args.