diff --git a/types/ember__polyfills/ember__polyfills-tests.ts b/types/ember__polyfills/ember__polyfills-tests.ts
index 044ed0413c..68a6588a69 100644
--- a/types/ember__polyfills/ember__polyfills-tests.ts
+++ b/types/ember__polyfills/ember__polyfills-tests.ts
@@ -6,13 +6,10 @@ import { assign, merge } from '@ember/polyfills';
     assign({ a: 6 }, { a: 'b'}).a; // $ExpectType string
     assign({ a: 6 }, {}).a; // $ExpectType number
     assign({ b: 6 }, {}).a; // $ExpectError
-    // TODO enable after https://github.com/typed-ember/ember-cli-typescript/issues/291
-    // assign({}, { b: 6 }, {}).b; // $ExpectType number
+    assign({}, { b: 6 }, {}).b; // $ExpectType number
     assign({ a: 'hello' }, { b: 6 }, {}).a; // $ExpectType string
-    // TODO enable after https://github.com/typed-ember/ember-cli-typescript/issues/291
-    // assign({ a: 'hello' }, { b: 6 }, { a: true }).a; // $ExpectType boolean
-    // TODO enable after https://github.com/typed-ember/ember-cli-typescript/issues/291
-    // assign({ a: 'hello' }, '', { a: true }).a; // $ExpectError
+    assign({ a: 'hello' }, { b: 6 }, { a: true }).a; // $ExpectType boolean
+    assign({ a: 'hello' }, '', { a: true }).a; // $ExpectError
     assign({ d: ['gobias industries'] }, { a: 'hello' }, { b: 6 }, { a: true }).d; // $ExpectType string[]
 })();
 
diff --git a/types/ember__utils/ember__utils-tests.ts b/types/ember__utils/ember__utils-tests.ts
index 8b270f1bec..4e05bb1e43 100644
--- a/types/ember__utils/ember__utils-tests.ts
+++ b/types/ember__utils/ember__utils-tests.ts
@@ -17,8 +17,7 @@ import EmberObject from '@ember/object';
         return;
     }
     const anotherString = maybeUndefined + 'another string';
-    // TODO fix upstream in @types/ember https://github.com/typed-ember/ember-cli-typescript/issues/256
-    // isNone();              // $ExpectType boolean
+    isNone();              // $ExpectType boolean
     isNone(null);          // $ExpectType boolean
     isNone(undefined);     // $ExpectType boolean
     isNone('');            // $ExpectType boolean
@@ -30,10 +29,9 @@ import EmberObject from '@ember/object';
     /** tryInvoke */
     let d = new Date('03/15/2013');
 
-    // TODO fix enhance in @types/ember https://github.com/typed-ember/ember-cli-typescript/issues/257
-    // tryInvoke(d, 'getTime');              // $ExpectType number
-    // tryInvoke(d, 'setFullYear', [2014]);  // $ExpectType number
-    // tryInvoke(d, 'noSuchMethod', [2014]); // $ExpectType undefined
+    tryInvoke(d, 'getTime');              // $ExpectType number
+    tryInvoke(d, 'setFullYear', [2014]);  // $ExpectType number
+    tryInvoke(d, 'noSuchMethod', [2014]); // $ExpectType undefined
     tryInvoke(d, 'getTime');
     tryInvoke(d, 'setFullYear', [2014]);
     tryInvoke(d, 'noSuchMethod', [2014]);
@@ -41,8 +39,7 @@ import EmberObject from '@ember/object';
 
 (function() {
     /** isPresent */
-    // TODO fix upstream in @types/ember https://github.com/typed-ember/ember-cli-typescript/issues/258
-    // isPresent();                // $ExpectType boolean
+    isPresent();                // $ExpectType boolean
     isPresent(null);            // $ExpectType boolean
     isPresent(undefined);       // $ExpectType boolean
     isPresent('');              // $ExpectType boolean
@@ -63,29 +60,27 @@ import EmberObject from '@ember/object';
 
 (function() {
     /** typeOf */
-    // TODO: more specific return type in @types/ember https://github.com/typed-ember/ember-cli-typescript/issues/259
-    // typeOf(null);                   // $ExpectType 'null'
-    // typeOf(undefined);              // $ExpectType 'undefined'
-    // typeOf('michael');              // $ExpectType 'string'
-    // // tslint:disable-next-line:no-construct
-    // typeOf(new String('michael'));  // $ExpectType 'string'
-    // typeOf(101);                    // $ExpectType 'number'
-    // // tslint:disable-next-line:no-construct
-    // typeOf(new Number(101));        // $ExpectType 'number'
-    // typeOf(true);                   // $ExpectType 'boolean'
-    // // tslint:disable-next-line:no-construct
-    // typeOf(new Boolean(true));      // $ExpectType 'boolean'
-    // typeOf(() => 4);                // $ExpectType 'function'
-    // typeOf([1, 2, 90]);             // $ExpectType 'array'
-    // typeOf(/abc/);                  // $ExpectType 'regexp'
-    // typeOf(new Date());             // $ExpectType 'date'
-    // typeOf(FileList);               // $ExpectType 'filelist'
-    // // typeOf(EmberObject.extend());   // $ExpectType 'class'
-    // // typeOf(EmberObject.create());   // $ExpectType 'instance'
-    // typeOf(new Error('teamocil'));  // $ExpectType 'error'
+    typeOf(null);                   // $ExpectType "null"
+    typeOf(undefined);              // $ExpectType "undefined"
+    typeOf('michael');              // $ExpectType "string"
+    // tslint:disable-next-line:no-construct
+    typeOf(new String('michael'));  // $ExpectType "string"
+    typeOf(101);                    // $ExpectType "number"
+    // tslint:disable-next-line:no-construct
+    typeOf(new Number(101));        // $ExpectType "number"
+    typeOf(true);                   // $ExpectType "boolean"
+    // tslint:disable-next-line:no-construct
+    typeOf(new Boolean(true));      // $ExpectType "boolean"
+    typeOf(() => 4);                // $ExpectType "function"
+    typeOf([1, 2, 90]);             // $ExpectType "array"
+    typeOf(/abc/);                  // $ExpectType "regexp"
+    typeOf(new Date());             // $ExpectType "date"
+    typeOf(new FileList());               // $ExpectType "filelist"
+    typeOf(EmberObject.extend());   // $ExpectType "class"
+    typeOf(EmberObject.create());   // $ExpectType "instance"
+    typeOf(new Error('teamocil'));  // $ExpectType "error"
 
-    // TODO fix upstream in @types/ember https://github.com/typed-ember/ember-cli-typescript/issues/260
-    // typeOf();
+    typeOf();
     typeOf(null);
     typeOf(undefined);
     typeOf('michael');
@@ -130,8 +125,7 @@ import EmberObject from '@ember/object';
 (function() {
     /** isBlank */
 
-    // TODO fix upstream in @types/ember https://github.com/typed-ember/ember-cli-typescript/issues/254
-    // isBlank(); // $ExpectType boolean
+    isBlank(); // $ExpectType boolean
     isBlank(null); // $ExpectType boolean
     isBlank(undefined); // $ExpectType boolean
     isBlank(''); // $ExpectType boolean
@@ -147,8 +141,7 @@ import EmberObject from '@ember/object';
 (function() {
     /** isEmpty */
 
-    // TODO fix upstream in @types/ember https://github.com/typed-ember/ember-cli-typescript/issues/255
-    // isEmpty(); // $ExpectType boolean
+    isEmpty(); // $ExpectType boolean
     isEmpty(null); // $ExpectType boolean
     isEmpty(undefined); // $ExpectType boolean
     isEmpty(''); // $ExpectType boolean