Move PKG_NATIVE_CACHE_BASE outside of dlopen function

Author: jiec-msft

prelude/bootstrap.js

@@ -2187,6 +2187,15 @@ function payloadFileSync(pointer) {
     dlopen: process.dlopen,
   };
 
+  // Allow users to override the cache base directory via PKG_NATIVE_CACHE_PATH environment variable
+  // Default: path.join(homedir(), '.cache')
+  //   - Linux/macOS: /home/john/.cache or /Users/john/.cache
+  //   - Windows: C:\Users\John\.cache
+  // Custom example: /opt/myapp/cache or C:\myapp\cache
+  // Native addons will be extracted to: <PKG_NATIVE_CACHE_BASE>/pkg/<hash>
+  const PKG_NATIVE_CACHE_BASE =
+    process.env.PKG_NATIVE_CACHE_PATH || path.join(homedir(), '.cache');
+
   function revertMakingLong(f) {
     if (/^\\\\\?\\/.test(f)) return f.slice(4);
     return f;
@@ -2206,11 +2215,7 @@ function payloadFileSync(pointer) {
       // the hash is needed to be sure we reload the module in case it changes
       const hash = createHash('sha256').update(moduleContent).digest('hex');
 
-      // Allow users to override the cache directory via PKG_NATIVE_CACHE_PATH environment variable
-      // Example: /home/john/.cache/pkg/<hash> or custom path like /opt/myapp/cache/pkg/<hash>
-      const cacheBase =
-        process.env.PKG_NATIVE_CACHE_PATH || path.join(homedir(), '.cache');
-      const tmpFolder = path.join(cacheBase, 'pkg', hash);
+      const tmpFolder = path.join(PKG_NATIVE_CACHE_BASE, 'pkg', hash);
 
       fs.mkdirSync(tmpFolder, { recursive: true });