From 2af31a09a95317b9e9edfa46788c76df417d3624 Mon Sep 17 00:00:00 2001
From: Mark Rapson <git@lzstealth.com>
Date: Sun, 18 Oct 2026 16:47:14 +0100
Subject: [PATCH] fix: build Windows exe from Windows node binary on
 non-Windows CI

---
 package-lock.json    |  4 ++--
 package.json         |  2 +-
 scripts/build-win.js | 45 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 48 insertions(+), 3 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index 8567f4c..c2eb4a4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "google-sheets-rate-assistant",
-  "version": "2.1.11",
+  "version": "2.1.12",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "google-sheets-rate-assistant",
-      "version": "2.1.11",
+      "version": "2.1.12",
       "dependencies": {
         "csv-stringify": "^6.0.0",
         "googleapis": "^173.0.0",
diff --git a/package.json b/package.json
index 0720e9f..7e3e709 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "google-sheets-rate-assistant",
-  "version": "2.1.11",
+  "version": "2.1.12",
   "description": "Pull Google Sheets data and export to CSV with configurable schedules and rate limiting.",
   "main": "index.js",
   "bin": "index.js",
diff --git a/scripts/build-win.js b/scripts/build-win.js
index 919bc16..5873bce 100644
--- a/scripts/build-win.js
+++ b/scripts/build-win.js
@@ -1,3 +1,4 @@
+const crypto = require('crypto');
 const fs = require('fs');
 const os = require('os');
 const path = require('path');
@@ -10,6 +11,39 @@ function normalizeBuildVersion(value) {
   return version.startsWith('v') ? version : `v${version}`;
 }
 
+async function download(url) {
+  const response = await fetch(url);
+  if (!response.ok) {
+    throw new Error(`Failed to download ${url}: ${response.status} ${response.statusText}`);
+  }
+  return Buffer.from(await response.arrayBuffer());
+}
+
+// SEA blobs must be injected into a node binary of the same version, and non-Windows hosts need a Windows base binary.
+async function getWindowsNodeBinary(tempDir) {
+  if (process.platform === 'win32') {
+    return process.execPath;
+  }
+
+  const baseUrl = `https://nodejs.org/dist/${process.version}`;
+  const [binary, shasums] = await Promise.all([
+    download(`${baseUrl}/win-x64/node.exe`),
+    download(`${baseUrl}/SHASUMS256.txt`),
+  ]);
+
+  const expected = shasums.toString('utf8').split('\n')
+    .map(line => line.trim().split(/\s+/))
+    .find(([, file]) => file === 'win-x64/node.exe');
+  const actual = crypto.createHash('sha256').update(binary).digest('hex');
+  if (!expected || expected[0] !== actual) {
+    throw new Error('Checksum verification failed for downloaded win-x64/node.exe');
+  }
+
+  const binaryPath = path.join(tempDir, 'node.exe');
+  fs.writeFileSync(binaryPath, binary);
+  return binaryPath;
+}
+
 async function main() {
   const distDir = path.resolve(__dirname, '..', 'dist');
   if (!fs.existsSync(distDir)) {
@@ -33,8 +67,11 @@ async function main() {
     logLevel: 'info',
   });
 
+  const executable = await getWindowsNodeBinary(tempDir);
+
   fs.writeFileSync(seaConfigPath, JSON.stringify({
     main: bundlePath,
+    executable,
     output: outputFile,
     mainFormat: 'commonjs',
     disableExperimentalSEAWarning: true,
@@ -43,6 +80,14 @@ async function main() {
   }, null, 2));
 
   execFileSync(process.execPath, ['--build-sea', seaConfigPath], {stdio: 'inherit'});
+
+  const header = Buffer.alloc(2);
+  const fd = fs.openSync(outputFile, 'r');
+  fs.readSync(fd, header, 0, 2, 0);
+  fs.closeSync(fd);
+  if (header.toString('latin1') !== 'MZ') {
+    throw new Error(`${outputFile} is not a Windows PE executable`);
+  }
 }
 
 main().catch(error => {