chore: add isFunction utils and improve isObject

src/utils/create/component.ts

@@ -2,6 +2,7 @@
  * Create a basic component with common options
  */
 import '../../locale';
+import { isFunction } from '..';
 import { camelize } from '../format/string';
 import { SlotsMixin } from '../../mixins/slots';
 import Vue, {
@@ -68,7 +69,7 @@ export function createComponent(name: string) {
   return function<Props = DefaultProps, Events = {}, Slots = {}>(
     sfc: VantComponentOptions | FunctionComponent
   ): TsxComponent<Props, Events, Slots> {
-    if (typeof sfc === 'function') {
+    if (isFunction(sfc)) {
       sfc = transformFunctionComponent(sfc);
     }
 

src/utils/create/i18n.ts

@@ -1,4 +1,4 @@
-import { get } from '..';
+import { get, isFunction } from '..';
 import { camelize } from '../format/string';
 import locale from '../../locale';
 
@@ -9,7 +9,7 @@ export function createI18N(name: string) {
     const messages = locale.messages();
     const message = get(messages, prefix + path) || get(messages, path);
 
-    return typeof message === 'function' ? message(...args) : message;
+    return isFunction(message) ? message(...args) : message;
   };
 }