build: Make check-pnpm as JS script (no-changelog) (#39857)

.githooks/check-pnpm.mjs

@@ -0,0 +1,36 @@
+#!/usr/bin/env node
+// Git hook helper (post-merge, post-rewrite, post-checkout): warn when the
+// installed pnpm major differs from the one pinned in package.json.
+// Usage: node .githooks/check-pnpm.mjs [checkout-type]
+// For post-checkout, pass lefthook's {3}: "0" is a file checkout, which we skip.
+import { spawnSync } from 'node:child_process';
+import { readFileSync } from 'node:fs';
+import { homedir } from 'node:os';
+import { fileURLToPath } from 'node:url';
+
+if (process.argv[2] === '0') process.exit(0);
+
+const packageJsonPath = fileURLToPath(new URL('../package.json', import.meta.url));
+const { packageManager = '' } = JSON.parse(readFileSync(packageJsonPath, 'utf8'));
+const wanted = /^pnpm@(\d+)/.exec(packageManager)?.[1];
+
+if (!wanted) process.exit(0);
+
+// Run from the home dir so pnpm reports the installed version,
+// not the version pinned by this repo.
+// `shell` lets Windows resolve pnpm.cmd. The command has no user input.
+const result = spawnSync('pnpm --version', { cwd: homedir(), shell: true, encoding: 'utf8' });
+const current = result.status === 0 ? result.stdout.trim().split('.')[0] : '';
+if (wanted === current) process.exit(0);
+
+const installCommand =
+	process.platform === 'win32'
+		? 'powershell -c "irm https://get.pnpm.io/install.ps1 | iex"'
+		: 'curl -fsSL https://get.pnpm.io/install.sh | sh -';
+
+console.log(`
+⚠ This repo now pins pnpm ${wanted} (you have ${current || 'none'}).
+  pnpm should auto-download it on the next install command.
+  If that fails (some pnpm 10 versions can't install v12), reinstall:
+    ${installCommand}
+`);

.githooks/check-pnpm.sh

@@ -1,13 +0,0 @@
-#!/bin/sh
-# .githooks/check-pnpm — symlink or call from post-merge, post-rewrite, post-checkout
-
-WANTED=$(sed -n 's/.*"packageManager": *"pnpm@\([0-9]*\).*/\1/p' package.json)
-CURRENT=$(cd ~ && pnpm --version 2>/dev/null | cut -d. -f1)
-[ -z "$WANTED" ] || [ "$WANTED" = "$CURRENT" ] && exit 0
-echo ""
-echo "⚠ This repo now pins pnpm $WANTED (you have ${CURRENT:-none})."
-echo "  pnpm should auto-download it on the next install command."
-echo "  If that fails (some pnpm 10 versions can't install v12), reinstall:"
-echo "    curl -fsSL https://get.pnpm.io/install.sh | sh -"
-echo ""
-exit 0

lefthook.yml

@@ -7,18 +7,18 @@ output:
 post-merge:
   commands:
     check-pnpm:
-      run: sh .githooks/check-pnpm.sh
+      run: node .githooks/check-pnpm.mjs
 
 post-rewrite:
   commands:
     check-pnpm:
-      run: sh .githooks/check-pnpm.sh
+      run: node .githooks/check-pnpm.mjs
 
 post-checkout:
   commands:
     check-pnpm:
-      # $3 is 1 for a branch checkout, 0 for a file checkout — skip the latter
-      run: '[ "{3}" = "0" ] || sh .githooks/check-pnpm.sh'
+      # $3 is 1 for a branch checkout, 0 for a file checkout — the script skips the latter
+      run: node .githooks/check-pnpm.mjs {3}
 
 pre-commit:
   commands: