To not be misleading, the title is wrong on user home path. It should be /Users/<me>/, but maybe <me> was removed by system due to possible security issue though.

This helper is an app bundle, like the upper one you provided. Since our main app is an Electron app, so the helper is started by node child_process.spawn() with command set to MyApp.app/Contents/MacOS/MyHelper.app/Contents/MacOS/MyHelper. I see from source code that Node spawn() calls libuv's uv_spawn(), which calls posix_spawn() when nothing went wrong through its call path. Otherwise, it fork()s and exec*()s though.

This helper is an app bundle, like the upper one you provided. Since our main app is an Electron app, so the helper is started by node child_process.spawn() with command set to MyApp.app/Contents/MacOS/MyHelper.app/Contents/MacOS/MyHelper. I see from source code that Node spawn() calls libuv's uv_spawn(), which calls posix_spawn() when nothing went wrong through its call path. Otherwise, it fork()s and exec*()s though.