Check if plugin is already loaded before adding components

Author: pro-src

src/index.ts

@@ -6,6 +6,10 @@ module.exports = (PluginHost: Application) => {
 
   const app = PluginHost.owner;
 
+  if (app.converter.hasComponent('markdown')) {
+    return;
+  }
+
   /**
    * Expose additional options for consumption.
    */