A CUE file may import definitions from builtin or user-defined packages. A CUE file does not need to be part of a package to use imports.
The example here shows the use of builtin packages.
This code groups the imports into a parenthesized, “factored” import statement.
You can also write multiple import statements, like:
import "encoding/json" import "math"
But it is good style to use the factored import statement.