fix: Changed judgment of undefined to not use a function (#1552)

Author: chimame

packages/graphql-shield/src/rules.ts

@@ -15,7 +15,6 @@ import {
 } from './types.js'
 import { isLogicRule } from './utils.js'
 import { GraphQLResolveInfo } from 'graphql'
-import { isUndefined } from 'util'
 
 export class Rule implements IRule {
   readonly name: string
@@ -387,7 +386,7 @@ export class RuleChain extends LogicRule {
     async function iterate([rule, ...otherRules]: ShieldRule[]): Promise<
       IRuleResult[]
     > {
-      if (isUndefined(rule)) return []
+      if (rule === undefined) return []
       return rule.resolve(parent, args, ctx, info, options).then((res) => {
         if (res !== true) {
           return [res]
@@ -441,7 +440,7 @@ export class RuleRace extends LogicRule {
     async function iterate([rule, ...otherRules]: ShieldRule[]): Promise<
       IRuleResult[]
     > {
-      if (isUndefined(rule)) return []
+      if (rule === undefined) return []
       return rule.resolve(parent, args, ctx, info, options).then((res) => {
         if (res === true) {
           return [res]