Don't rely on actual typenames

src/components/CalendarWidget.tsx

@@ -1,7 +1,7 @@
+import "./CalendarWidget.css"
 import { useState } from "react"
 import { FacadeExtern } from "../backend"
 import { useExtern, useExternOr } from "../extern"
-import "./CalendarWidget.css"
 import { WidgetControl, Widget } from "./Widget"
 import { dateRange, shortdate, today } from "../util/calendar"
 import { FileWidget } from "./FileWidget"
@@ -76,4 +76,8 @@ export class CalendarWidget implements Widget {
       </>
     ]
   }
+
+  typename(): string {
+      return "CalendarWidget"
+  }
 }

src/components/ConfigWidget.tsx

@@ -14,4 +14,8 @@ export class ConfigWidget implements Widget {
       </>,
     ]
   }
+
+  typename(): string {
+      return "ConfigWidget"
+  }
 }

src/components/FileWidget.tsx

@@ -66,4 +66,8 @@ export class FileWidget implements Widget {
       </>,
     ]
   }
+
+  typename(): string {
+      return "FileWidget"
+  }
 }

src/components/Widget.tsx

@@ -18,6 +18,7 @@ export interface WidgetControl extends SiteControl {
 }
 
 export interface Widget {
+  typename(): string
   show(ctl: WidgetControl): [JSX.Element, JSX.Element]
 }