Merge pull request #14245 from dcherman/http_errors_headers

[http-headers]: Add the `headers` property to the exported interface

http-errors/http-errors-tests.ts

@@ -26,6 +26,7 @@ console.log(err.message);
 console.log(err.status);
 console.log(err.statusCode);
 console.log(err.expose);
+console.log(err.headers);
 
 // createError(status, msg)
 var err = createError(404, 'LOL');

http-errors/index.d.ts

@@ -11,6 +11,9 @@ declare module 'http-errors' {
             status: number;
             statusCode: number;
             expose: boolean;
+            headers?: {
+                [key: string]: string
+            };
         }
 
         type HttpErrorConstructor = new(msg?: string) => HttpError;