code: function initWxsProcessor(opts, defaultBabelProcessorName) {
      registerProcessor({
          name: 'wxs2filter',
          processor(file, options) {
              let content = file.content.toString();
  
              return {
                  content: wxs2filter(content)
              };
          },
          extnames: ['wxs'],
          rext: 'filter.js'
      });
  }
docs: Initialize wxs js processor
  
  @inner
  @param {Object=} opts the options to init
  @param {string=} opts.processor the builtin processor name, by default `babel`
  @param {Array=} opts.plugins the processor plugins
  @param {string} defaultBabelProcessorName default babel processor name