Add unit tests for ServerAddOn

Reviewed By: mweststrate

Differential Revision: D34303780

fbshipit-source-id: 03a4570a6e891d979b87caca14f51068d74df877

desktop/flipper-server-core/src/plugins/loadServerAddOn.tsx

@@ -0,0 +1,46 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+import {
+  ServerAddOn as ServerAddOnFn,
+  ServerAddOnStartDetails,
+} from 'flipper-common';
+import {assertNotNull} from '../comms/Utilities';
+// The file is generated automatically by "prepareDefaultPlugins" in "scripts"
+// @ts-ignore
+import defaultPlugins from '../defaultPlugins';
+
+interface ServerAddOnModule {
+  default: ServerAddOnFn;
+}
+
+export const loadServerAddOn = (
+  pluginName: string,
+  details: ServerAddOnStartDetails,
+): ServerAddOnModule => {
+  console.debug('loadPlugin', pluginName, details);
+
+  if (details.isBundled) {
+    const bundledPlugin = defaultPlugins[pluginName];
+    assertNotNull(
+      bundledPlugin,
+      `loadPlugin (isBundled = true) -> plugin ${pluginName} not found.`,
+    );
+    return bundledPlugin;
+  }
+
+  assertNotNull(
+    details.path,
+    `loadPlugin (isBundled = false) -> server add-on path is empty plugin ${pluginName}.`,
+  );
+
+  // eslint-disable-next-line no-eval
+  const serverAddOnModule = eval(`require("${details.path}")`);
+  return serverAddOnModule;
+};