feat: add mutations

shared/src/mutators.ts

@@ -0,0 +1,24 @@
+import type { Transaction } from "@rocicorp/zero";
+import type { AuthData } from "./auth";
+import type { Schema } from "./schema";
+import { isLoggedIn } from "./zql";
+
+type Tx = Transaction<Schema>;
+
+export function createMutators(authData: AuthData | null) {
+  return {
+    transaction: {
+      async create(tx: Tx, { name, amount }: { name: string, amount: number }) {
+        isLoggedIn(authData);
+        await tx.mutate.transaction.insert({
+          id: 'id-' + Math.random().toString(),
+          user_id: authData.user.id,
+          name,
+          amount,
+        })
+      }
+    }
+  } as const;
+}
+
+export type Mutators = ReturnType<typeof createMutators>;