feat: Convert all mutation files to js

packages/backend/src/graphql/mutations/update-flow.js

@@ -0,0 +1,18 @@
+const updateFlow = async (_parent, params, context) => {
+  context.currentUser.can('update', 'Flow');
+
+  let flow = await context.currentUser
+    .$relatedQuery('flows')
+    .findOne({
+      id: params.input.id,
+    })
+    .throwIfNotFound();
+
+  flow = await flow.$query().patchAndFetch({
+    name: params.input.name,
+  });
+
+  return flow;
+};
+
+export default updateFlow;