“KD” — an unauthorized biography on Kevin Durant due out in May — doesn’t report the Warriors superstar definitively will leave the Bay Area, but gives pages of clues on why he will never feel complete by finishing his career there.

The book, written by Bay Area journalist Marcus Thompson II, depicts Durant as striving to be beloved, seeking to “build an empire.’’ An advance copy was obtained by The Post.

“Durant doesn’t just fight for titles and trophies,’’ Thompson writes. “He fights for No. 1 in the court of public opinion.”

While Durant may be six weeks away from guiding the Warriors to their third straight title, the book portrays him as seeking to erase negative feelings from 2016’s stunning Golden State signing.

Durant, it seems, wants to be remembered for more, only enhancing the idea the Knicks will have Durant’s undivided attention July 1.

“KD’’ describes Durant’s crushed feelings about harsh public reaction to him joining a franchise that had already won a championship, boasted three All-Stars and had just eliminated his Oklahoma City Thunder in an epic seven-game series.

After the announcement, the book reports, Durant embarked on an unplanned Nike promotional trip to China for a signature shoe and felt “exiled.’’

“But that was where he found the bottom of the pit,’’ Thompson writes. “He crossed the Pacific Ocean but couldn’t escape the vitriol. He knew it was coming. He didn’t know it would be ‘this’ intense, ‘this’ unforgiving.” Durant was “watching the demolition of his reputation happen in real time.”

Citing a San Francisco magazine article, Durant phoned his manager, Rich Kleiman, and barked, “Why the f–k did you let me do this to my life?’’

Even describing the 2018 NBA Finals, when Durant hit the dagger 3-pointer in Game 3 that became the unofficial knockout blow to LeBron James’ Cavaliers, Durant failed to celebrate. Durant’s joyless body language after the shot is one of the most memorable descriptions in the narrative.

Much of the tome centers on Durant’s hardscrabble upbringing in the DC area. Explored also is his complex relationship with his father, Wayne Pratt, who repeatedly bounced in and out of his childhood, but remains a forceful influence. (The Post has reported Pratt as a longtime Knicks fan.)

A lot of the book offerings delve into Durant’s sensitive psyche.

“He’s been told by so many to not give the opinions of others so much credence,’’ Thompson writes. “But he does. Because he wants you to recognize — needs you to recognize — the depths of his greatness.”

According to the book, Durant isn’t shy about texting a reporter in the wee hours to complain about a reference in a story on him.

Some passages indicate Durant can never become as popular as Stephen Curry in the Bay Area, even though it illuminates how deeply Curry recruited him.

Tellingly, the book’s final chapter is titled “The Next Chapter.’’ Durant’s future options are dissected.

According to Thompson, “As long as Durant is on the Warriors, his legacy is tarnished. Durant dissenters want him to carry a contender from the ground up, winning as an underdog. Whatever ill will created, his success with the Warriors could be washed away by Durant resurrecting the Knicks. If Durant delivered that, he’d be a deity in New York basketball.’’

Thompson opines that success in New York is “more than a long shot,’’ adding: “The Knicks for decades have been a magnet for dysfunction, which suggest they would have a hard time putting the pieces around Durant to win a title. Such a challenge might be appealing to Durant.’’

Thompson listed the Clippers and Sixers as alternatives that could wipe clean the Golden State signing stigma. Thomas suggests that winning the Clippers their first title after being the Lakers’ stepsister “would make him an icon.’’

Either way, the “KD” book doesn’t make it seem his final chapter will be in San Francisco, though it reports Durant bought a place there and he visited the under-construction arena earlier this season.

The book ends: “The question left to answer is: Where will this pursuit leave him among the greats?’’