fix(http): isElementStruct with null

packages/http/src/http.ts

@@ -8,7 +8,16 @@
  * You should have received a copy of the MIT License along with this program.
  */
 
-import { asyncOperation, ClassType, CustomError, getClassName, getClassTypeFromInstance, isArray, isClassInstance } from '@deepkit/core';
+import {
+    asyncOperation,
+    ClassType,
+    CustomError,
+    getClassName,
+    getClassTypeFromInstance,
+    isArray,
+    isClassInstance,
+    isObject,
+} from '@deepkit/core';
 import { OutgoingHttpHeaders, ServerResponse } from 'http';
 import { eventDispatcher } from '@deepkit/event';
 import { HttpRequest, HttpRequestPositionedParameters, HttpResponse } from './model.js';
@@ -29,12 +38,12 @@ import {
     Type,
     typeSettings,
     UnpopulatedCheck,
-    ValidationError
+    ValidationError,
 } from '@deepkit/type';
 import stream from 'stream';
 
 export function isElementStruct(v: any): v is ElementStruct {
-    return 'object' === typeof v && v.hasOwnProperty('render') && v.hasOwnProperty('attributes') && !v.slice;
+    return isObject(v) && 'hasOwnProperty' in v && v.hasOwnProperty('render') && v.hasOwnProperty('attributes');
 }
 
 let templateRender: typeof render;

packages/http/tests/core.spec.ts

@@ -0,0 +1,15 @@
+import { isElementStruct } from '../src/http.js';
+import { expect, test } from '@jest/globals';
+
+test('isElementStruct', () => {
+    expect(isElementStruct(null)).toBe(false);
+    expect(isElementStruct(undefined)).toBe(false);
+    expect(isElementStruct(0)).toBe(false);
+    expect(isElementStruct({})).toBe(false);
+    expect(isElementStruct(new Date)).toBe(false);
+    expect(isElementStruct(Object.create(null))).toBe(false);
+    expect(isElementStruct(true)).toBe(false);
+    expect(isElementStruct([])).toBe(false);
+    expect(isElementStruct(function b(){} )).toBe(false);
+    expect(isElementStruct({render: {}, attributes: {}})).toBe(true);
+});