sync

packages/util/src/context.ts

@@ -0,0 +1,21 @@
+import { AsyncLocalStorage } from "node:async_hooks"
+
+export namespace Context {
+  export class NotFound extends Error {}
+
+  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(value, fn)
+      },
+    }
+  }
+}