From 164bce85717baced0c8f84b9c73f852a82a6784b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mat=C4=9Bj=20Chalk?= <matej.chalk@flowup.cz>
Date: Wed, 26 Mar 2025 10:48:18 +0100
Subject: [PATCH] fix(plugin-js-packages): handle empty output from yarn
 outdated

---
 .../src/lib/package-managers/yarn-classic/outdated-result.ts  | 4 ++--
 .../src/lib/package-managers/yarn-classic/types.ts            | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/packages/plugin-js-packages/src/lib/package-managers/yarn-classic/outdated-result.ts b/packages/plugin-js-packages/src/lib/package-managers/yarn-classic/outdated-result.ts
index dc605d0ce..ca29ac1d0 100644
--- a/packages/plugin-js-packages/src/lib/package-managers/yarn-classic/outdated-result.ts
+++ b/packages/plugin-js-packages/src/lib/package-managers/yarn-classic/outdated-result.ts
@@ -20,8 +20,8 @@ import {
 
 export function yarnv1ToOutdatedResult(output: string): OutdatedResult {
   const yarnv1Outdated = fromJsonLines<Yarnv1OutdatedResultJson>(output);
-  const fields = yarnv1Outdated[1].data.head;
-  const dependencies = yarnv1Outdated[1].data.body;
+  const fields = yarnv1Outdated[1]?.data.head ?? [];
+  const dependencies = yarnv1Outdated[1]?.data.body ?? [];
 
   // no outdated dependencies
   if (dependencies.length === 0) {
diff --git a/packages/plugin-js-packages/src/lib/package-managers/yarn-classic/types.ts b/packages/plugin-js-packages/src/lib/package-managers/yarn-classic/types.ts
index 24bc4e29e..5d1461a9a 100644
--- a/packages/plugin-js-packages/src/lib/package-managers/yarn-classic/types.ts
+++ b/packages/plugin-js-packages/src/lib/package-managers/yarn-classic/types.ts
@@ -51,4 +51,4 @@ type Yarnv1Table = {
   };
 };
 
-export type Yarnv1OutdatedResultJson = [Yarnv1Info, Yarnv1Table];
+export type Yarnv1OutdatedResultJson = [Yarnv1Info, Yarnv1Table] | [];