refactor(server): standalone runtime module (#9120)

packages/backend/server/src/base/runtime/event.ts

@@ -0,0 +1,22 @@
+import { FlattenedAppRuntimeConfig } from '../config/types';
+import { OnEvent } from '../event';
+import { Payload } from '../event/def';
+
+declare module '../event/def' {
+  interface EventDefinitions {
+    runtime: {
+      [K in keyof FlattenedAppRuntimeConfig]: {
+        changed: Payload<FlattenedAppRuntimeConfig[K]>;
+      };
+    };
+  }
+}
+
+/**
+ * not implemented yet
+ */
+export const OnRuntimeConfigChange_DO_NOT_USE = (
+  nameWithModule: keyof FlattenedAppRuntimeConfig
+) => {
+  return OnEvent(`runtime.${nameWithModule}.changed`);
+};