Add type-tests for @ember/reactive

Author: NullVoxPopuli

package.json

@@ -281,6 +281,7 @@
       "@ember/object/promise-proxy-mixin.js": "ember-source/@ember/object/promise-proxy-mixin.js",
       "@ember/object/proxy.js": "ember-source/@ember/object/proxy.js",
       "@ember/owner/index.js": "ember-source/@ember/owner/index.js",
+      "@ember/reactive/index.js": "ember-source/@ember/reactive/index.js",
       "@ember/renderer/index.js": "ember-source/@ember/renderer/index.js",
       "@ember/routing/-internals.js": "ember-source/@ember/routing/-internals.js",
       "@ember/routing/hash-location.js": "ember-source/@ember/routing/hash-location.js",
@@ -402,4 +403,4 @@
     }
   },
   "packageManager": "[email protected]"
-}
+}

type-tests/@ember/reactive-test.ts

@@ -0,0 +1,28 @@
+import { trackedArray, trackedObject, trackedWeakSet, trackedSet, trackedMap, trackedWeakMap } from '@ember/reactive';
+import { expectTypeOf } from 'expect-type';
+
+
+// ------- trackedArray -------
+expectTypeOf(trackedArray()).toEqualTypeOf<unknown[]>();
+expectTypeOf(trackedArray([1, 3])).toEqualTypeOf<number[]>();
+
+// ------- trackedObject -------
+expectTypeOf(trackedObject()).toEqualTypeOf<object>();
+expectTypeOf(trackedObject({ foo: 2 } as const)).toEqualTypeOf<{ readonly foo: 2 }>();
+
+// ------- trackedWeakSet -------
+expectTypeOf(trackedWeakSet<object>()).toEqualTypeOf<WeakSet<object>>();
+expectTypeOf(trackedWeakSet([{ foo: 2 } as const])).toEqualTypeOf<WeakSet<{ readonly foo: 2 }>>();
+
+// ------- trackedSet -------
+expectTypeOf(trackedSet<number>()).toEqualTypeOf<Set<number>>();
+expectTypeOf(trackedSet(new Set([1, 2, 3]))).toEqualTypeOf<Set<number>>()
+
+
+// ------- trackedMap -------
+expectTypeOf(trackedMap<string, number>()).toEqualTypeOf<Map<string, number>>();
+expectTypeOf(trackedMap(new Map([['foo', 2]]))).toEqualTypeOf<Map<string, number>>();
+
+// ------- trackedWeakMap -------
+expectTypeOf(trackedWeakMap<object, string>()).toEqualTypeOf<WeakMap<object, string>>();
+expectTypeOf(trackedWeakMap([[{ greet: 'hi'}, 2], [{greet: 'hello'}, 3]])).toEqualTypeOf<WeakMap<{ greet: string}, number>>();