Recompilation of simplejson data source is unavailable in 6.5.2

The plugin developed before grafana 5.4.3 was compiled using grunt. After upgrading to grafana 6.5.2, the node version was upgraded (to 10.9.0), the grunt compilation failed, and the grunt-babel (V8.0) compilation method was upgraded. See Figure 1.

After compiling, it is placed in the 6.5.2 version, the plug-in cannot be used. See Figure 2.

It is not available in 5.4.3 and 6.5.2. It was found that no load came in when loading the file of the plugin. Is it a new version of grunt-babel compilation? Or how to solve it, thank you