awesome-phonenumber | libphonenumber pre-compiled with the closure compiler

The dialog method dialog.showSaveDialog returns a promise which resolves to an object, it does not return a string:

dialog.showSaveDialog([browserWindow, ]options)

Returns Promise - Resolve with an object containing the following:

• canceled Boolean - whether or not the dialog was canceled.
• filePath String (optional) - If the dialog is canceled, this will be undefined.
• bookmark String (optional) macOS mas - Base64 encoded string which contains the security scoped bookmark data for the saved file. securityScopedBookmarks must be enabled for this to be present. (For return values, see table here.)

You have to await for dialog.showSaveDialog or use dialog.showSaveDialogSync and also, you can make exportData to be asynchronous rather than creating an inner async function.

Try to refactor your code like this:

twilio refer to different objects in these modules. require('twilio') is factory function. It's expected to create a new object even when it's called with same arguments, require('twilio')(...) !== require('twilio')(...).