feat: initial mini simple event sourcing for pending application updates

domain/projections/ApplicationUpdates.ts

@@ -0,0 +1,18 @@
+export type UpdateDefinition = {
+  id: string;
+  newVersion: string;
+};
+
+export default class ApplicationUpdates implements DomainProjection {
+  private readonly pendingUpdates: UpdateDefinition[] = [];
+  handle(event: DomainEvent<any>): void {
+    if (event.type === "ApplicationUpdateStarted") {
+      console.log("ApplicationUpdateStarted", event.payload);
+      this.pendingUpdates.push(event.payload);
+    }
+  }
+
+  getPendingUpdates(): UpdateDefinition[] {
+    return this.pendingUpdates;
+  }
+}