Update isObject util to avoid false negatives with Nuxt dev server

src/utils/lang/__tests__/index.spec.ts

@@ -231,26 +231,26 @@ test('LANG UTILS / isIntegerNumber', () => {
 
 test('LANG UTILS / isObject', () => {
   // positive
-  expect(isObject({})).toBe(true); // Should return true for map objects.
-  expect(isObject({ a: true })).toBe(true); // Should return true for map objects.
-  expect(isObject(new Object())).toBe(true); // Should return true for map objects.
-  expect(isObject(Object.create({}))).toBe(true); // Should return true for map objects.
-  expect(isObject(Object.create(Object.prototype))).toBe(true); // Should return true for map objects.
+  expect(isObject({})).toBe(true); // Should return true for plain objects (objects created by the Object built-in constructor).
+  expect(isObject({ a: true })).toBe(true); // Should return true for plain objects.
+  expect(isObject(new Object())).toBe(true); // Should return true for plain objects.
+  expect(isObject(Object.create({}))).toBe(true); // Should return true for plain objects.
+  expect(isObject(Object.create(Object.prototype))).toBe(true); // Should return true for plain objects.
 
   // negative
-  expect(isObject([])).toBe(false); // Should return false for anything that is not a map object.
-  expect(isObject(() => { })).toBe(false); // Should return false for anything that is not a map object.
-  expect(isObject(true)).toBe(false); // Should return false for anything that is not a map object.
-  expect(isObject(false)).toBe(false); // Should return false for anything that is not a map object.
-  expect(isObject(null)).toBe(false); // Should return false for anything that is not a map object.
-  expect(isObject(undefined)).toBe(false); // Should return false for anything that is not a map object.
-  expect(isObject(1)).toBe(false); // Should return false for anything that is not a map object.
-  expect(isObject('asd')).toBe(false); // Should return false for anything that is not a map object.
-  expect(isObject(function () { })).toBe(false); // Should return false for anything that is not a map object.
-  expect(isObject(Symbol('test'))).toBe(false); // Should return false for anything that is not a map object.
-  expect(isObject(new Promise(res => res()))).toBe(false); // Should return false for anything that is not a map object.
+  expect(isObject([])).toBe(false); // Should return false for anything that is not a plain object.
+  expect(isObject(() => { })).toBe(false); // Should return false for anything that is not a plain object.
+  expect(isObject(true)).toBe(false); // Should return false for anything that is not a plain object.
+  expect(isObject(false)).toBe(false); // Should return false for anything that is not a plain object.
+  expect(isObject(null)).toBe(false); // Should return false for anything that is not a plain object.
+  expect(isObject(undefined)).toBe(false); // Should return false for anything that is not a plain object.
+  expect(isObject(1)).toBe(false); // Should return false for anything that is not a plain object.
+  expect(isObject('asd')).toBe(false); // Should return false for anything that is not a plain object.
+  expect(isObject(function () { })).toBe(false); // Should return false for anything that is not a plain object.
+  expect(isObject(Symbol('test'))).toBe(false); // Should return false for anything that is not a plain object.
+  expect(isObject(new Promise(res => res()))).toBe(false); // Should return false for anything that is not a plain object.
   // Object.create(null) creates an object with no prototype which may be tricky to handle. Filtering that out too.
-  expect(isObject(Object.create(null))).toBe(false); // Should return false for anything that is not a map object.
+  expect(isObject(Object.create(null))).toBe(false); // Should return false for anything that is not a plain object.
 
 });
 

src/utils/lang/index.ts

@@ -150,11 +150,35 @@ export function isNaNNumber(val: any): boolean {
   return val !== val;
 }
 
+function _isObject(o: any) {
+  return Object.prototype.toString.call(o) === '[object Object]';
+}
+
 /**
- * Validates if a value is an object with the Object prototype (map object).
+ * Validates if a value is an object created by the Object constructor (plain object).
+ * Adapted from:
+ *
+ * is-plain-object <https://github.com/jonschlinkert/is-plain-object>
+ *
+ * Copyright (c) 2014-2017, Jon Schlinkert.
+ * Released under the MIT License.
  */
-export function isObject(obj: any): boolean {
-  return obj !== null && typeof obj === 'object' && obj.constructor === Object;
+export function isObject(o: any): boolean {
+  if (_isObject(o) === false) return false;
+
+  // If has modified constructor
+  const ctor = o.constructor;
+  if (ctor === undefined) return false; // `Object.create(null)`
+
+  // If has modified prototype
+  const prot = ctor.prototype;
+  if (_isObject(prot) === false) return false;
+
+  // If constructor does not have an Object-specific method
+  if (Object.prototype.hasOwnProperty.call(prot, 'isPrototypeOf') === false) return false;
+
+  // Most likely a plain Object
+  return true;
 }
 
 /**