Add TypeScript declaration files

Author: SergeAstapov

package.json

@@ -121,5 +121,12 @@
   },
   "ember-addon": {
     "configPath": "tests/dummy/config"
+  },
+  "typesVersions": {
+    "*": {
+      "*": [
+        "types/*"
+      ]
+    }
   }
 }

types/test-support/load.d.ts

@@ -0,0 +1,5 @@
+import type { TestLoader } from 'ember-qunit/test-loader';
+
+declare class EmberExamTestLoader extends TestLoader {}
+
+export default function loadEmberExam(): EmberExamTestLoader;

types/test-support/start.d.ts

@@ -0,0 +1,5 @@
+import type { start } from 'ember-qunit';
+
+type QUnitStartOptions = Parameters<typeof start>[0];
+
+export default function startEmberExam(options?: QUnitStartOptions): void;