code: function updateReferProcessorInfo(existedProcessors, processorName, referProcessorName) {
      let currProcessor = existedProcessors[processorName];
      if (!currProcessor || currProcessor.processor) {
          return;
      }
  
      let referProcessorInfo = existedProcessors[referProcessorName];
      if (!referProcessorInfo) {
          return;
      }
  
      let deps = referProcessorInfo.deps;
      deps && !Array.isArray(deps) && (deps = [deps]);
  
      let oldDeps = currProcessor.deps;
      oldDeps && !Array.isArray(oldDeps) && (oldDeps = [oldDeps]);
  
      let old = Object.assign({}, currProcessor);
      Object.assign(currProcessor, referProcessorInfo, old, {
          refer: referProcessorName,
          deps: merge(deps || [], oldDeps || []),
          processor: referProcessorInfo.processor
      });
  }
docs: Update existed processor processor info. If the processor has been defined,
  it'll skip the update.
  
  @param {Object} existedProcessors the existed processors info
  @param {string} processorName the processor name to update
  @param {string} referProcessorName the refer processor