This is more of a note than an issue - but on Windows in Nodejs 6.9.2 (V8 5.1.281) the third line in the following script causes an error in the v8 compiler:

const sphincs = require('sphincs')
console.log('blah')
const keyPair = sphincs.keyPair()

blah


#
# Fatal error in ..\..\src\compiler.cc, line 786
# Check failed: !info->shared_info()->feedback_vector()->metadata()->SpecDiffersFrom( info->literal()->feedback_vector_spec()).
#

Node 7.8.0 (V8 5.5.372) is not affected - so the resolution is to either switch to latest or wait for Node LTS 8.x.x.

I haven't tested on Linux but I have no reason to believe this is specific to Windows as it's precompiled javascript and not a node-gyp, python or C++ dist issue.