TBM 900 Pilot reported a conflict during landing roll out with a helicopter that was taking off from the opposite end of the runway.

Narrative

I landed at ZZZ after making appropriate traffic calls on the UNICOM frequency. When I checked in 15 miles to the east; I overheard a helicopter making a traffic call landing at ZZZ; before I would enter the pattern. I entered right traffic for Runway XX and made appropriate traffic calls during each phase of the pattern. During the end of the landing roll out as I was about to turn clear of the runway; the helicopter who had previously landed came into view moving left to right near the displaced threshold of Runway XY; hovering and then taking off perpendicular to the runway without any traffic calls. The helicopter was 200 ft in front and maybe 50 ft above me as I made the turn off the runway onto the ramp. I was very displeased to note the lack of separation between us and lack of communication from the helicopter.I heard no traffic calls from the departing helicopter and despite my query as to if he was on frequency I received no response. If I had needed to go around on that landing there would have been a serious conflict. It is likely the helicopter was monitoring the correct frequency on landing because I heard him but then changed frequencies or ignored my calls during what was likely a quick turn based on the short amount of time from when he announced intention to land to when he took off again. There were no other aircraft operating on the ground or in the air at ZZZ the time and the airport was unattended.