code: function yamlConfig() {
    var Parser = this.Parser
    var Compiler = this.Compiler
    var parser = Parser && Parser.prototype.blockTokenizers
    var compiler = Compiler && Compiler.prototype.visitors
  
    if (parser && parser.yamlFrontMatter) {
      parser.yamlFrontMatter = factory(parser.yamlFrontMatter)
    }
  
    if (compiler && compiler.yaml) {
      compiler.yaml = factory(compiler.yaml)
    }
  }
docs: /* Modify remark to read configuration from comments.