refactor: move isClass to separate function and use in isObject

packages/core/src/utilities/isClass.ts

@@ -0,0 +1,3 @@
+export default function isClass(item: any): boolean {
+  return item.constructor?.toString().substring(0, 5) === 'class'
+}

packages/core/src/utilities/isObject.ts

@@ -1,19 +1,10 @@
+import isClass from './isClass'
+
 export default function isObject(item: any): boolean {
-  if (!item) {
+  return (
-    return false
+    item
-  }
+    && typeof item === 'object'
-
+    && !Array.isArray(item)
-  if (typeof item !== 'object') {
+    && !isClass(item)
-    return false
+  )
-  }
-
-  if (Array.isArray(item)) {
-    return false
-  }
-
-  if (item.constructor?.toString().substring(0, 5) === 'class') {
-    return false
-  }
-
-  return true
 }