Method to fetch the Device Flow access token once

[OlivierRiberi]

Problem

While implementing the Device Flow, I noticed that the only way to check if the user is logged in with the user code, is to use the .poll() method.
This method will call the token endpoint in a defined interval until the tokenSet is received or the user code is expired.

I'm using node-openid-client as part of an API-based website backend.
To get the up to date login status I need to handle the polling on the frontend side. So at a defined interval I'm calling a custom endpoint to get the status.
However DeviceFlowHandle does not provide an equivalent to .poll() to fetch the data once (so without the automatic polling, nor the error handling).

Would it be possible to expose the token endpoint call process defined in .poll() in another method for people like me that already handle the polling part elsewhere?

Workaround

I have a custom endpoint to get the user code and start the polling from the backend. The status and the eventual tokenSet are saved in cache.
And I have another custom endpoint to get the status/tokenSet from the cache.

Issue:
By doing so, the polling stops when the tokenSet is returned or the user code is expired, but not if the user closes the browser window, moves away, or reloads the page to fetch another user code for example.

[panva]

Would it be possible to expose the token endpoint call process defined in .poll() in another method for people like me that already handle the polling part elsewhere?

You can use client.grant() to execute the urn:ietf:params:oauth:grant-type:device_code grant without polling.

[OlivierRiberi]

Oh, of course. Thank you!