code: function getCachedBinary() {
    var i,
      cachePath,
      cacheBinary,
      cachePathCandidates = getCachePathCandidates(),
      binaryName = getBinaryName();
  
    for (i = 0; i < cachePathCandidates.length; i++) {
      cachePath = path.join(cachePathCandidates[i], pkg.name, pkg.version);
      cacheBinary = path.join(cachePath, binaryName);
  
      if (fs.existsSync(cacheBinary)) {
        return cacheBinary;
      }
    }
  
    return '';
  }
docs: The cached binding
  
  Check the candidates directories provided by `getCachePathCandidates()` for
  the binding file, if it exists. By treating the candidate directories
  as a prioritised list this method is deterministic, assuming no change to the
  local environment.
  
  @return {String} path to cached binary
  @api public