core: experimental hot reload support

packages/migrate/script.ts

@@ -1,3 +1,9 @@
-import './scripts/hustoj';
-import './scripts/vijos';
-import './scripts/syzoj';
+import { apply as hustoj } from './scripts/hustoj';
+import { apply as syzoj } from './scripts/syzoj';
+import { apply as vijos } from './scripts/vijos';
+
+export function apply(ctx) {
+    hustoj(ctx);
+    vijos(ctx);
+    syzoj(ctx);
+}