What is the point of view of the book Holes by Louis Sachar?

Sachar mainly uses a third-person point of view in writing Holes. This means that the narrator of the story isn't part of the action and can tell us everything that's going on, including what's happening inside the heads of characters. Sachar only really gives us an insight into what's happening inside Stanley's head, as he's the protagonist, making this third-person limited narration.
Sometimes the third-person point of view is omniscient, meaning that it comes across as a kind of God's-eye perspective, looking down on the characters from above, exploring all their thoughts, and moving rapidly back and forth between different time periods. At other times, a more restricted third-person point of view is in operation, one that doesn't give us the full picture and which therefore allows us to use our imagination to fill in the gaps. We see this in relation to Zero, whose deepest thoughts are never given to us by the narrator.