From 62bce642757454630341df504b8b9ee51f1332da Mon Sep 17 00:00:00 2001
From: Zoltan Kochan <z@kochan.io>
Date: Wed, 25 Mar 2026 13:59:54 +0100
Subject: [PATCH] fix: extract pnpm version from packageManager field instead
 of returning undefined (#216)

When packageManager is set to e.g. "pnpm@9.1.0+sha...", strip the
"pnpm@" prefix and any "+sha..." hash suffix so the action installs
the correct version. Previously returning undefined caused failures
on Windows.
---
 dist/index.js           | Bin 1427862 -> 1427908 bytes
 src/install-pnpm/run.ts |   4 ++--
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/dist/index.js b/dist/index.js
index 0319f354f6bdc5a38ff05203efb9130d28ed9731..885a0c2fab92195032967742fa2eade0516baac2 100644
GIT binary patch
delta 118
zcmbO>IsC}v@P-z~7N!>F7M2#)7Pc1l7LFFq7OocV7M>Q~7QPn#7J(MQ7NHj57LhHY
zkM~ah6v`+xy=#xCxRGX2YDsBPo<gQxQEEX>Vsfg6QbArpu7i?}l9DD|Og~0jPfJA~
NBxb!`V4r9kHvm@FCR6|b

delta 72
zcmX>yIegmW@P-z~7N!>F7M2#)7Pc1l7LFFq7OocV7M>Q~7QPn#7J(MQ7NHj57LhHY
ckM}YvPX8FnC_KGukEl44rsj6LeWGpL0DW{A0{{R3

diff --git a/src/install-pnpm/run.ts b/src/install-pnpm/run.ts
index 0c20f6d..6499130 100644
--- a/src/install-pnpm/run.ts
+++ b/src/install-pnpm/run.ts
@@ -101,8 +101,8 @@ Remove one of these versions to avoid version mismatch errors like ERR_PNPM_BAD_
   }
 
   if (typeof packageManager === 'string' && packageManager.startsWith('pnpm@')) {
-    // pnpm will handle version management via packageManager field
-    return undefined
+    // Strip the "pnpm@" prefix and any "+sha..." hash suffix
+    return packageManager.replace('pnpm@', '').replace(/\+.*$/, '')
   }
 
   if (!GITHUB_WORKSPACE) {