Feat(express-http-context): added isolate function

packages/express-http-context/src/browser.js

@@ -4,6 +4,10 @@ export const middleware = (req, res, next) => {
   throw new Error("`middleware` cannot be called from the browser code.");
 };
 
+export const isolate = (fn) => {
+  throw new Error("`isolate` cannot be called from the browser code.");
+};
+
 export const get = () => null;
 
 export const set = (key, value) => {};

packages/express-http-context/src/index.js

@@ -6,9 +6,12 @@ export const store = new AsyncLocalStorage();
 
 /** Express.js middleware that is responsible for initializing the context for each request. */
 export const middleware = (req, res, next) => {
-  store.run({}, () => {
-    next();
-  });
+  store.run({}, next);
+};
+
+/** Runs a given function in an isolated context */
+export const isolate = (fn) => {
+  store.run({}, fn);
 };
 
 /**

packages/express-http-context/types/index.d.ts

@@ -4,6 +4,9 @@ import { AsyncLocalStorage } from "async_hooks";
 /** Express.js middleware that is responsible for initializing the context for each request. */
 export declare function middleware(req: Request, res: Response, next: NextFunction): void;
 
+/** Runs a given function in an isolated context */
+export declare function isolate(fn: Function): void;
+
 /**
  * Gets a value from the context by key.  Will return undefined if the context has not yet been initialized for this request or if a value is not found for the specified key.
  */