1 files changed, 64 insertions, 0 deletions
diff --git a/packages/shared/plugins.ts b/packages/shared/plugins.ts
new file mode 100644
index 00000000..2ce5826a
--- /dev/null
+++ b/packages/shared/plugins.ts
@@ -0,0 +1,64 @@
+// Implementation inspired from Outline
+
+import logger from "./logger";
+import { SearchIndexClient } from "./search";
+
+export enum PluginType {
+  Search = "search",
+}
+
+interface PluginTypeMap {
+  [PluginType.Search]: SearchIndexClient;
+}
+
+export interface TPlugin<T extends PluginType> {
+  type: T;
+  name: string;
+  provider: PluginProvider<PluginTypeMap[T]>;
+}
+
+export interface PluginProvider<T> {
+  getClient(): Promise<T | null>;
+}
+
+export class PluginManager {
+  private static providers = new Map<PluginType, TPlugin<PluginType>[]>();
+
+  static register<T extends PluginType>(plugin: TPlugin<T>): void {
+    const p = PluginManager.providers.get(plugin.type);
+    if (!p) {
+      PluginManager.providers.set(plugin.type, [plugin]);
+      return;
+    }
+    p.push(plugin);
+  }
+
+  static async getClient<T extends PluginType>(
+    type: T,
+  ): Promise<PluginTypeMap[T] | null> {
+    const provider = PluginManager.providers.get(type);
+    if (!provider) {
+      return null;
+    }
+    return await provider[provider.length - 1].provider.getClient();
+  }
+
+  static isRegistered<T extends PluginType>(type: T): boolean {
+    return !!PluginManager.providers.get(type);
+  }
+
+  static logAllPlugins() {
+    logger.info("Plugins (Last one wins):");
+    for (const type of Object.values(PluginType)) {
+      logger.info(`  ${type}:`);
+      const plugins = PluginManager.providers.get(type);
+      if (!plugins) {
+        logger.info("    - None");
+        continue;
+      }
+      for (const plugin of plugins) {
+        logger.info(`    - ${plugin.name}`);
+      }
+    }
+  }
+}