How to get the player towards direction?

As the title say, I want to get what axis the player is facing towards. What I am referring is not the direction (east,west,north,south), but if the player is moving along the X/Z axis in the positive/negative direction (so specifically the value where it says “Towards xxx”
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Dont believe that is exposed on the server end, however its easy to calculate.

Listen to the MoveEvent and then compare the new location to the old location.