New Jersey senior director of player personnel Dan MacKinnon said Hughes has been everything the Devils had envisioned.
"He's a student of the game, respectful and confident," MacKinnon said. "His ability to execute in small space, which is so much a part of how offenses generate in today's NHL, is phenomenal. I just think he's going to be able to have success because he's able to do that.
"It's not that he needs to skate away from players to create his offense, which some guys have to do to get separation, but he's able to execute when there's really not much room at all. It's going to be interesting to see how that translates to the NHL."
Hughes said he will return to Toronto at the conclusion of camp Saturday to continue preparing for Devils training camp in September.
"I think for me, it's about getting bigger and stronger and enhancing my skills," he said. "Once I get here for training camp, I'll learn a lot more. I'll maybe put on two or three more pounds but nothing crazy. I don't want to get too big where I can't move out there, so I'll add a little bit of muscle. I think that'll be good for me."
Hughes had 20 points (nine goals, 11 assists) in seven games to help the United States finish third at the 2019 IIHF World Under-18 Championship and finished one point shy of the single-tournament record of 21 points set by forward Nikita Kucherov of Russia, now with the Tampa Bay Lightning, in 2011. Hughes finished his season with three assists in seven games for the United States at the 2019 IIHF World Championship.