code: function chunkNameResolver(chunk) {
      var name = null;
  
      if (chunk.name) {
          name = chunk.name;
      } else {
          var moduleFileName = getLazyModuleFileName(chunk);
          var hash = calcChunkHash(chunk);
  
          if (moduleFileName) {
              name = moduleFileName + '-' + hash;
          } else {
              name = hash;
          }
      }
  
      return name;
  }
docs: 获取 chunk 的名字
  
  @param {object} chunk
  @return {string} chunk 的名字