🤖 Merge PR DefinitelyTyped#59917 [cookie-parser] Add secret to expres…

…s's request by @mckramer

types/cookie-parser/cookie-parser-tests.ts

@@ -4,6 +4,9 @@ import cookieParser = require('cookie-parser');
 const app = express();
 app.use(cookieParser('optional secret string'));
 
+const req = null as any as express.Request;
+req.secret; // $ExpectType string | undefined
+
 let obj: object;
 let str: string;
 let notTrue: false;

types/cookie-parser/index.d.ts

@@ -7,6 +7,20 @@
 
 import * as express from 'express';
 
+declare global {
+    namespace Express {
+        // Inject additional properties on express.Request
+        interface Request {
+            /**
+             * This request's secret.
+             * Optionally set by cookie-parser if secret(s) are provided.  Can be used by other middleware.
+             * [Declaration merging](https://www.typescriptlang.org/docs/handbook/declaration-merging.html) can be used to add your own properties.
+             */
+            secret?: string;
+        }
+    }
+}
+
 declare function cookieParser(secret?: string | string[], options?: cookieParser.CookieParseOptions): express.RequestHandler;
 
 declare namespace cookieParser {