fix: update isNativeVariable checker

Author: jorenrui

lib/entity/data.js

@@ -1,5 +1,6 @@
 import { Lexer } from '@/generators/lexer'
 import { State } from '@/state'
+import { isNativeVariable } from '@/helpers/variables'
 
 const IGNORED_IDS = ['this', '$']
 
@@ -46,11 +47,7 @@ export class Data {
     if (attr === 'each') {
       const [_, variable] = expr.split(' in ')
 
-      const isNativeVariable =
-        typeof window[variable] === 'function' &&
-        window[variable].toString().indexOf('[native code]') === -1
-
-      if (isNativeVariable) return
+      if (isNativeVariable(variable)) return
       if (IGNORED_IDS.includes(variable)) return
       if (variable in this.entity.state) return
       this.add(variable, attr)

lib/helpers/variables.js

@@ -1,3 +1,3 @@
 export const isNativeVariable = (variable) =>
   typeof window[variable] === 'function' &&
-  window[variable].toString().indexOf('[native code]') === -1
+  window[variable].toString().indexOf('[native code]') !== -1