Having 'nan' in node_modules causes error with string sub-command FIND

[sailingKieler]

Hey devs,
I'm not sure which part of cmake or cmake-js is actual responsible for this, I just try it here for a start:

We're developing project including llvm-bindings that leverages cmake-js, and that contributes native addons to node.js based on node-addon-api.
We have other dependencies that transitively pull NAN.

If NAN is contained in the (root level) node_modules folder, cmake fails with this error:

CMake Error at cmake/CMakeJS.cmake:31 (string):
  string sub-command FIND: unknown last parameter
Call Stack (most recent call first):
  cmake/CMakeJS.cmake:55 (get_variable)
  CMakeLists.txt:9 (include)

The location of failure is this: https://github.com/ApsarasX/llvm-bindings/blob/69c93f7aae697c3cb3e75d01e447554b0565e3d5/cmake/CMakeJS.cmake#L31

We can overcome this issue by ensuring that NAN is not hoisted to the root level node_modules, which feels hacky and I'm not sure whether further similar issues will come up.

Do you have any suggestions to solve this better?