code: function (less, pluginManager) {
          var version = less.version;
  
          var options = this.options;
  
          // won't work before 2.4.0
          if (options.autoImport && (version[0] > 2 || version[1] >= 4)) {
              require('./injector').install(less, pluginManager);
          }
  
          if (options.uniqueDirectives) {
              require('./unique-directives').install(less, pluginManager);
          }
  
          // needed before 2.3.0
          if (version[1] < 3) {
              require('./custom-functions').install(less, pluginManager);
          }
      }
docs: Installation method
  @method
  @param {Object} less the less.js instance
  @param {Object} pluginManager less.js plugin manager instance