replace internal module to namespace

expect.js/expect.js.d.ts

@@ -5,7 +5,7 @@
 
 declare function expect(target?: any): Expect.Root;
 
-declare module Expect {
+declare namespace Expect {
     interface Assertion {
         /**
          * Check if the value is truthy
@@ -224,4 +224,4 @@ declare module "expect.js" {
 
     export = expect;
 
-}
+}