try build

jest.config.js

@@ -0,0 +1,8 @@
+// This file is needed because it is used by vscode and other tools that
+// call `jest` directly.  However, unless you are doing anything special
+// do not edit this file
+
+const standard = require('@grafana/toolkit/src/config/jest.plugin.config');
+
+// This process will use the same config that `yarn test` is using
+module.exports = standard.jestConfig();

src/module.ts

@@ -2,7 +2,7 @@ import { PanelPlugin } from '@grafana/data';
 import { SimpleOptions } from './types';
 import { SimplePanel } from './SimplePanel';
 
-export const plugin = new PanelPlugin<SimpleOptions>(SimplePanel).setPanelOptions(builder => {
+export const plugin = new PanelPlugin<SimpleOptions>(SimplePanel).setPanelOptions((builder) => {
   return builder
     .addTextInput({
       path: 'text',
@@ -35,6 +35,6 @@ export const plugin = new PanelPlugin<SimpleOptions>(SimplePanel).setPanelOption
           },
         ],
       },
-      showIf: config => config.showSeriesCount,
+      showIf: (config) => config.showSeriesCount,
     });
 });