feat: add envelopes api (#2105)

packages/trpc/utils/data-transformer.ts

@@ -0,0 +1,17 @@
+import type { DataTransformer } from '@trpc/server';
+import SuperJSON from 'superjson';
+
+export const dataTransformer: DataTransformer = {
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  serialize: (data: any) => {
+    if (data instanceof FormData) {
+      return data;
+    }
+
+    return SuperJSON.serialize(data);
+  },
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  deserialize: (data: any) => {
+    return SuperJSON.deserialize(data);
+  },
+};