code: function (tree, data) {
        // Process the tree and get the output.
        var output = this.process(tree, data)
        if (this.debugging) {
          this.plugins.debug.process([], {
            includedTemplates: this.includedTemplates,
            assignedVars: data
          })
        }
        this.clear()
  
        return {
          output: output.tpl,
          smarty: output.smarty
        }
      }
docs: Process the tree and return the data.