perf: always use the same prototype Iterator

lib/fetch/formdata.js

@@ -1,6 +1,6 @@
 'use strict'
 
-const { isBlobLike, makeIterator } = require('./util')
+const { isBlobLike, iteratorMixin } = require('./util')
 const { kState } = require('./symbols')
 const { kEnumerableProperty } = require('../core/util')
 const { File: UndiciFile, FileLike, isFileLike } = require('./file')
@@ -154,62 +154,9 @@ class FormData {
       this[kState].push(entry)
     }
   }
-
-  entries () {
-    webidl.brandCheck(this, FormData)
-
-    return makeIterator(
-      () => this[kState],
-      'FormData',
-      'key+value',
-      'name', 'value'
-    )
-  }
-
-  keys () {
-    webidl.brandCheck(this, FormData)
-
-    return makeIterator(
-      () => this[kState],
-      'FormData',
-      'key',
-      'name', 'value'
-    )
-  }
-
-  values () {
-    webidl.brandCheck(this, FormData)
-
-    return makeIterator(
-      () => this[kState],
-      'FormData',
-      'value',
-      'name', 'value'
-    )
-  }
-
-  /**
-   * @param {(value: string, key: string, self: FormData) => void} callbackFn
-   * @param {unknown} thisArg
-   */
-  forEach (callbackFn, thisArg = globalThis) {
-    webidl.brandCheck(this, FormData)
-
-    webidl.argumentLengthCheck(arguments, 1, { header: 'FormData.forEach' })
-
-    if (typeof callbackFn !== 'function') {
-      throw new TypeError(
-        "Failed to execute 'forEach' on 'FormData': parameter 1 is not of type 'Function'."
-      )
-    }
-
-    for (const [key, value] of this) {
-      callbackFn.call(thisArg, value, key, this)
-    }
-  }
 }
 
-FormData.prototype[Symbol.iterator] = FormData.prototype.entries
+iteratorMixin('FormData', FormData, kState, 'name', 'value')
 
 Object.defineProperties(FormData.prototype, {
   append: kEnumerableProperty,
@@ -218,11 +165,6 @@ Object.defineProperties(FormData.prototype, {
   getAll: kEnumerableProperty,
   has: kEnumerableProperty,
   set: kEnumerableProperty,
-  entries: kEnumerableProperty,
-  keys: kEnumerableProperty,
-  values: kEnumerableProperty,
-  forEach: kEnumerableProperty,
-  [Symbol.iterator]: { enumerable: false },
   [Symbol.toStringTag]: {
     value: 'FormData',
     configurable: true

lib/fetch/headers.js

@@ -6,7 +6,7 @@ const { kHeadersList, kConstruct } = require('../core/symbols')
 const { kGuard } = require('./symbols')
 const { kEnumerableProperty } = require('../core/util')
 const {
-  makeIterator,
+  iteratorMixin,
   isValidHeaderName,
   isValidHeaderValue
 } = require('./util')
@@ -504,67 +504,14 @@ class Headers {
     return headers
   }
 
-  keys () {
-    webidl.brandCheck(this, Headers)
-
-    return makeIterator(
-      () => this[kHeadersSortedMap],
-      'Headers',
-      'key',
-      0, 1
-    )
-  }
-
-  values () {
-    webidl.brandCheck(this, Headers)
-
-    return makeIterator(
-      () => this[kHeadersSortedMap],
-      'Headers',
-      'value',
-      0, 1
-    )
-  }
-
-  entries () {
-    webidl.brandCheck(this, Headers)
-
-    return makeIterator(
-      () => this[kHeadersSortedMap],
-      'Headers',
-      'key+value',
-      0, 1
-    )
-  }
-
-  /**
-   * @param {(value: string, key: string, self: Headers) => void} callbackFn
-   * @param {unknown} thisArg
-   */
-  forEach (callbackFn, thisArg = globalThis) {
-    webidl.brandCheck(this, Headers)
-
-    webidl.argumentLengthCheck(arguments, 1, { header: 'Headers.forEach' })
-
-    if (typeof callbackFn !== 'function') {
-      throw new TypeError(
-        "Failed to execute 'forEach' on 'Headers': parameter 1 is not of type 'Function'."
-      )
-    }
-
-    for (const [key, value] of this) {
-      callbackFn.call(thisArg, value, key, this)
-    }
-  }
-
   [Symbol.for('nodejs.util.inspect.custom')] () {
     webidl.brandCheck(this, Headers)
 
     return this[kHeadersList]
   }
 }
 
-Headers.prototype[Symbol.iterator] = Headers.prototype.entries
+iteratorMixin('Headers', Headers, kHeadersSortedMap, 0, 1)
 
 Object.defineProperties(Headers.prototype, {
   append: kEnumerableProperty,
@@ -573,11 +520,6 @@ Object.defineProperties(Headers.prototype, {
   has: kEnumerableProperty,
   set: kEnumerableProperty,
   getSetCookie: kEnumerableProperty,
-  keys: kEnumerableProperty,
-  values: kEnumerableProperty,
-  entries: kEnumerableProperty,
-  forEach: kEnumerableProperty,
-  [Symbol.iterator]: { enumerable: false },
   [Symbol.toStringTag]: {
     value: 'Headers',
     configurable: true