AMSTERDAM, April 17 (Reuters) - Dutch computer chip equipment maker ASML's sales to China remained strong in the first quarter despite an increasing array of export restrictions imposed by the U.S. and Dutch governments.

According to a document published by the company alongside its first-quarter results, sales of ASML's lithography systems to customers in China made up 49% percent of the total or around 2 billion euros ($2.12 billion).

ASML sells equipment to both domestic Chinese chipmakers and foreign firms with operations in China, but does not provide a breakdown on which shipments go to which firms. ($1 = 0.9420 euros) (Reporting by Toby Sterling; Editing by Jamie Freed)