fixes chai-things import issues (#24975)

types/chai-things/chai-things-tests.ts

@@ -1,8 +1,7 @@
 
 
-import chai = require('chai');
-import chaiThings = require('chai-things');
-
+import * as chai from 'chai';
+import * as chaiThings from 'chai-things';
 chai.use(chaiThings);
 
 function test_somethingSyntax() {

types/chai-things/index.d.ts

@@ -60,5 +60,6 @@ interface Array<T> {
 
 declare module "chai-things" {
     function chaiThings(chai: any, utils: any): void;
+    namespace chaiThings { }
     export = chaiThings;
 }