SAN FRANCISCO — Apple will manufacture a new version of its Mac Pro computer in China, shifting production of the only major product the company has assembled in the United States outside the country, a person familiar with the plans said on Friday.

The move, reported on Friday by The Wall Street Journal, was revealed amid heightened trade tensions with China. The person familiar with Apple’s plans was not authorized to discuss them publicly.

The Mac Pro, a high-end desktop computer that sells for $6,000, accounts for a small portion of Apple’s sales, but it is a rare example of an American technology company’s attempt to do more manufacturing in the United States.

Apple’s chief executive, Timothy D. Cook, went on prime-time television in 2012 to announce that the company would make a Mac computer in the United States, the first Apple product in years to be manufactured by American workers. The top-of-the-line Mac Pro, built in a facility in Austin, Tex., would come with the inscription “Assembled in USA,” Mr. Cook said.

