feat: checkpoint

platform/storage/package.json

@@ -0,0 +1,13 @@
+{
+  "name": "@platform/storage",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "main": "./storage.ts",
+  "exports": {
+    ".": "./storage.ts"
+  },
+  "dependencies": {
+    "@platform/relay": "workspace:*"
+  }
+}

platform/storage/storage.ts

@@ -0,0 +1,22 @@
+import { AsyncLocalStorage } from "node:async_hooks";
+
+import { InternalServerError } from "@platform/relay";
+
+export const storage = new AsyncLocalStorage<StorageContext>();
+
+/**
+ * TODO ...
+ */
+export function getStorageContext(): StorageContext {
+  const store = storage.getStore();
+  if (store === undefined) {
+    throw new InternalServerError(
+      "Storage 'store' missing, make sure to resolve within a 'node:async_hooks' wrapped context.",
+    );
+  }
+  return store;
+}
+
+export interface StorageContext {
+  id: string;
+}