feat: Sync to OSS repo

packages/core/src/context.ts

@@ -0,0 +1,31 @@
+import { AsyncLocalStorage } from 'node:async_hooks';
+
+import { ErrorCodes, VisibleError } from './error.js';
+
+export namespace Context {
+	export class NotFound extends VisibleError {
+		constructor() {
+			super(
+				'internal',
+				ErrorCodes.Server.INTERNAL_ERROR,
+				'No context available - actor-dependent code was called outside of Actor.with()'
+			);
+		}
+	}
+
+	export function create<T>() {
+		const storage = new AsyncLocalStorage<T>();
+		return {
+			use() {
+				const result = storage.getStore();
+				if (!result) {
+					throw new NotFound();
+				}
+				return result;
+			},
+			provide<R>(value: T, fn: () => R) {
+				return storage.run<R>(value, fn);
+			}
+		};
+	}
+}