fixed define

package.json

@@ -1,6 +1,6 @@
 {
   "name": "es.shim",
-  "version": "2.4.2",
+  "version": "2.4.3",
   "description": "实现部分新API, 以及一些常用的扩展方法",
   "keyworks": [
     "es5",

src/lib/array.js

@@ -17,13 +17,15 @@ Object.defineProperty(Array.prototype, 'flat', {
     }
 
     return arr
-  }
+  },
+  writable: true
 })
 
 Object.defineProperty(Array.prototype, 'flatMap', {
   value(fn) {
     return this.map(fn).flat()
-  }
+  },
+  writable: true
 })
 
 if (!Array.prototype.at) {

src/lib/number.js

@@ -10,7 +10,8 @@ const NATIVE_TO_FIXED = Number.prototype.toFixed
 Object.defineProperty(Number.prototype, 'toFixed', {
   value(n) {
     return NATIVE_TO_FIXED.call(this + Number.EPSILON, n)
-  }
+  },
+  writable: true
 })
 
 // 简单的数字处理

src/lib/promise.js

@@ -4,7 +4,7 @@
  */
 
 if (!Promise.defer) {
-  Promise.defer = function() {
+  Promise.defer = function () {
     let obj = {}
     obj.promise = new Promise((resolve, reject) => {
       obj.resolve = resolve
@@ -13,3 +13,7 @@ if (!Promise.defer) {
     return obj
   }
 }
+
+if (!Promise.withResolvers) {
+  Promise.withResolvers = Promise.defer
+}

src/lib/set.js

@@ -104,5 +104,6 @@ if (!Set.prototype.union) {
 Object.defineProperty(Set.prototype, 'equals', {
   value(other) {
     return this.size === other.size && this.isSubsetOf(other)
-  }
+  },
+  writable: true
 })