support non-ui plugins

frontend/src/components/PluginView.tsx

@@ -12,7 +12,9 @@ const PluginView: VFC = () => {
 
   return (
     <PanelSection>
-      {plugins.map(({ name, icon }) => (
+      {plugins
+        .filter((p) => p.content)
+        .map(({ name, icon }) => (
           <PanelSectionRow key={name}>
             <ButtonItem layout="below" onClick={() => setActivePlugin(name)}>
               <div style={{ display: 'flex', justifyContent: 'space-between' }}>

frontend/src/plugin.ts

@@ -1,6 +1,6 @@
 export interface Plugin {
-  name: any;
-  content: any;
-  icon: any;
+  name: string;
+  icon: JSX.Element;
+  content?: JSX.Element;
   onDismount?(): void;
 }