code: function(name) {
    // Walk up the module call tree until we find a module containing name in its peerOptionalDependencies
    var currentModule = module;
    var found = false;
    while (currentModule) {
      // Check currentModule has a package.json
      location = currentModule.filename;
      var location = find_package_json(location)
      if (!location) {
        currentModule = get_parent_module(currentModule);
        continue;
      }
  
      // Read the package.json file
      var object = JSON.parse(fs.readFileSync(f('%s/package.json', location)));
      // Is the name defined by interal file references
      var parts = name.split(/\//);
  
      // Check whether this package.json contains peerOptionalDependencies containing the name we're searching for
      if (!object.peerOptionalDependencies || (object.peerOptionalDependencies && !object.peerOptionalDependencies[parts[0]])) {
        currentModule = get_parent_module(currentModule);
        continue;
      }
      found = true;
      break;
    }
  
    // Check whether name has been found in currentModule's peerOptionalDependencies
    if (!found) {
      throw new Error(f('no optional dependency [%s] defined in peerOptionalDependencies in any package.json', parts[0]));
    }
  
    return {
      object: object,
      parts: parts
    }
  }
docs: Find the package.json object of the module closest up the module call tree that contains name in that module's peerOptionalDependencies