Gets a data-flow node corresponding to a use of the API component represented by this node.
For example, require('fs').readFileSync is a use of the function readFileSync from the
fs module, and require('fs').readFileSync(file) is a use of the return of that function.
This includes indirect uses found via data flow, meaning that in
f(obj.foo); function f(x) {}; both obj.foo and x are uses of the foo member from obj.
As another example, in the assignment exports.plusOne = (x) => x+1 the two references to
x are uses of the first parameter of plusOne.