From 86ee54aee969a6836c9dafa0305bb1eea240736b Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Wed, 25 Feb 2026 21:16:10 +0000
Subject: [PATCH] fix: preserve empty array body in stripEmptySlots

Co-authored-by: mrlubos <12529395+mrlubos@users.noreply.github.com>
---
 .../@hey-api/client-core/__tests__/params.test.ts    | 12 ++++++++++++
 .../plugins/@hey-api/client-core/bundle/params.ts    |  2 +-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/packages/openapi-ts/src/plugins/@hey-api/client-core/__tests__/params.test.ts b/packages/openapi-ts/src/plugins/@hey-api/client-core/__tests__/params.test.ts
index 12bb0c253..940b2ecc3 100644
--- a/packages/openapi-ts/src/plugins/@hey-api/client-core/__tests__/params.test.ts
+++ b/packages/openapi-ts/src/plugins/@hey-api/client-core/__tests__/params.test.ts
@@ -344,6 +344,18 @@ describe('buildClientParams', () => {
       description: 'strip empty slots',
       params: {},
     },
+    {
+      args: [[]],
+      config: [
+        {
+          in: 'body',
+        },
+      ],
+      description: 'empty array body',
+      params: {
+        body: [],
+      },
+    },
   ];
 
   it.each(scenarios)('$description', async ({ args, config, params }) => {
diff --git a/packages/openapi-ts/src/plugins/@hey-api/client-core/bundle/params.ts b/packages/openapi-ts/src/plugins/@hey-api/client-core/bundle/params.ts
index 84e61716c..8930daef1 100644
--- a/packages/openapi-ts/src/plugins/@hey-api/client-core/bundle/params.ts
+++ b/packages/openapi-ts/src/plugins/@hey-api/client-core/bundle/params.ts
@@ -94,7 +94,7 @@ interface Params {
 
 const stripEmptySlots = (params: Params) => {
   for (const [slot, value] of Object.entries(params)) {
-    if (value && typeof value === 'object' && !Object.keys(value).length) {
+    if (value && typeof value === 'object' && !Array.isArray(value) && !Object.keys(value).length) {
       delete params[slot as Slot];
     }
   }
-- 
2.51.2