code: function getImportFilterModules(usedFilters, scriptFile, buildManager) {
      if (!usedFilters) {
          return;
      }
  
      let filterModules = [];
      let {file: filterFile, filterNames: definedFilters} = scriptFile.filters || {};
      let hasFilterUsed = definedFilters && usedFilters.some(item => {
          if (definedFilters.includes(item)) {
              return true;
          }
          return false;
      });
  
      if (!hasFilterUsed) {
          return filterModules;
      }
  
      if (filterFile) {
          let src = relative(filterFile.path, scriptFile.dirname);
          if (src.charAt(0) !== '.') {
              src = './' + src;
          }
          filterModules.push({src, filters: definedFilters});
      }
      else {
          filterModules.push({filters: definedFilters});
      }
  
      return filterModules;
  }
docs: Get need to import filter modules
  
  @inner
  @param {Array.<string>} usedFilters the used filter names
  @param {Object} scriptFile the script file to declare the local filter
  @param {BuildManager} buildManager the build manager
  @return {?Array.<Object>}