fix: #391 editor not supporting Object.create(null) as object

Author: josdejong

package-lock.json

@@ -90,7 +90,7 @@
     "ajv": "^8.12.0",
     "codemirror-wrapped-line-indent": "^1.0.0",
     "diff-sequences": "^29.6.3",
-    "immutable-json-patch": "6.0.0",
+    "immutable-json-patch": "6.0.1",
     "jmespath": "^0.16.0",
     "json-source-map": "^0.6.1",
     "jsonrepair": "^3.5.1",
@@ -147,7 +147,7 @@
     "svelte-check": "3.6.3",
     "svelte-preprocess": "5.1.3",
     "typescript": "5.3.3",
-    "vite": "5.0.11",
+    "vite": "5.0.12",
     "vitest": "1.2.1"
   }
 }

package.json

@@ -9,7 +9,11 @@ import type { JSONParser } from '../types.js'
 export function isObject(value: unknown): value is Record<string, unknown> {
   // note that we check constructor.name, not constructor === Object,
   // so we can use objects created in a different JS realm like an iframe.
-  return typeof value === 'object' && value !== null && value.constructor.name === 'Object'
+  return (
+    typeof value === 'object' &&
+    value !== null &&
+    (value.constructor === undefined || value.constructor.name === 'Object')
+  )
 }
 
 /**
@@ -22,7 +26,9 @@ export function isObjectOrArray(value: unknown): value is Object | Array<unknown
   return (
     typeof value === 'object' &&
     value !== null &&
-    (value.constructor.name === 'Object' || value.constructor.name === 'Array')
+    (value.constructor === undefined ||
+      value.constructor.name === 'Object' ||
+      value.constructor.name === 'Array')
   )
 }