detect and fix early Set methods implementations

Author: zloirock

CHANGELOG.md

@@ -39,6 +39,7 @@
     - `DataView.prototype.setUint8Clamped`
 - Used strict mode in some missed cases, [#1269](https://github.com/zloirock/core-js/issues/1269)
 - Fixed [a Chromium 117 bug](https://bugs.chromium.org/p/v8/issues/detail?id=14222) in `value` argument of `URLSearchParams.prototype.{ has, delete }`
+- Fixed early WebKit `Set` methods implementation by the actual spec
 - Fixed incorrect `Symbol.{ dispose, asyncDispose }` descriptors from [NodeJS 20.4](https://github.com/nodejs/node/issues/48699) / transpilers helpers / userland code
 - Fixed forced polyfilling of some iterator helpers that should return wrapped iterator in the pure version
 - Fixed and exposed [`AsyncIteratorPrototype` `core-js/configurator` option](https://github.com/zloirock/core-js#asynciterator-helpers), [#1268](https://github.com/zloirock/core-js/issues/1268)

packages/core-js-compat/src/data.mjs

@@ -2200,8 +2200,6 @@ export const data = {
   'esnext.set.delete-all': {
   },
   'esnext.set.difference.v2': {
-    bun: '0.6.0',
-    safari: '17.0',
   },
   // TODO: Remove from `core-js@4`
   'esnext.set.difference': {
@@ -2215,29 +2213,21 @@ export const data = {
   'esnext.set.from': {
   },
   'esnext.set.intersection.v2': {
-    bun: '0.5.7',
-    safari: '17.0',
   },
   // TODO: Remove from `core-js@4`
   'esnext.set.intersection': {
   },
   'esnext.set.is-disjoint-from.v2': {
-    bun: '0.5.7',
-    safari: '17.0',
   },
   // TODO: Remove from `core-js@4`
   'esnext.set.is-disjoint-from': {
   },
   'esnext.set.is-subset-of.v2': {
-    bun: '0.5.7',
-    safari: '17.0',
   },
   // TODO: Remove from `core-js@4`
   'esnext.set.is-subset-of': {
   },
   'esnext.set.is-superset-of.v2': {
-    bun: '0.5.7',
-    safari: '17.0',
   },
   // TODO: Remove from `core-js@4`
   'esnext.set.is-superset-of': {
@@ -2253,15 +2243,11 @@ export const data = {
   'esnext.set.some': {
   },
   'esnext.set.symmetric-difference.v2': {
-    bun: '0.5.7',
-    safari: '17.0',
   },
   // TODO: Remove from `core-js@4`
   'esnext.set.symmetric-difference': {
   },
   'esnext.set.union.v2': {
-    bun: '0.5.7',
-    safari: '17.0',
   },
   // TODO: Remove from `core-js@4`
   'esnext.set.union': {

packages/core-js/internals/set-method-accept-set-like.js

@@ -1,9 +1,9 @@
 'use strict';
 var getBuiltIn = require('../internals/get-built-in');
 
-var createEmptySetLike = function () {
+var createSetLike = function (size) {
   return {
-    size: 0,
+    size: size,
     has: function () {
       return false;
     },
@@ -18,10 +18,17 @@ var createEmptySetLike = function () {
 };
 
 module.exports = function (name) {
+  var Set = getBuiltIn('Set');
   try {
-    var Set = getBuiltIn('Set');
-    new Set()[name](createEmptySetLike());
-    return true;
+    new Set()[name](createSetLike(0));
+    try {
+      // late spec change, early Safari implementation does not pass it
+      // https://github.com/tc39/proposal-set-methods/pull/88
+      new Set()[name](createSetLike(-1));
+      return false;
+    } catch (error2) {
+      return true;
+    }
   } catch (error) {
     return false;
   }

tests/compat/tests.js

@@ -223,6 +223,40 @@ function createStringTrimMethodTest(METHOD_NAME) {
   };
 }
 
+function createSetLike(size) {
+  return {
+    size: size,
+    has: function () {
+      return false;
+    },
+    keys: function () {
+      return {
+        next: function () {
+          return { done: true };
+        }
+      };
+    }
+  };
+}
+
+function createSetMethodTest(METHOD_NAME) {
+  return function () {
+    try {
+      new Set()[METHOD_NAME](createSetLike(0));
+      try {
+        // late spec change, early Safari implementation does not pass it
+        // https://github.com/tc39/proposal-set-methods/pull/88
+        new Set()[METHOD_NAME](createSetLike(-1));
+        return false;
+      } catch (error2) {
+        return true;
+      }
+    } catch (error) {
+      return false;
+    }
+  };
+}
+
 function NATIVE_RAW_JSON() {
   var unsafeInt = '9007199254740993';
   var raw = JSON.rawJSON(unsafeInt);
@@ -1731,9 +1765,7 @@ GLOBAL.tests = {
   'esnext.set.delete-all': function () {
     return Set.prototype.deleteAll;
   },
-  'esnext.set.difference.v2': function () {
-    return Set.prototype.difference;
-  },
+  'esnext.set.difference.v2': createSetMethodTest('difference'),
   'esnext.set.every': function () {
     return Set.prototype.every;
   },
@@ -1746,18 +1778,12 @@ GLOBAL.tests = {
   'esnext.set.from': function () {
     return Set.from;
   },
-  'esnext.set.intersection.v2': function () {
+  'esnext.set.intersection.v2': [createSetMethodTest('intersection'), function () {
     return Array.from(new Set([1, 2, 3]).intersection(new Set([3, 2]))) == '3,2';
-  },
-  'esnext.set.is-disjoint-from.v2': function () {
-    return Set.prototype.isDisjointFrom;
-  },
-  'esnext.set.is-subset-of.v2': function () {
-    return Set.prototype.isSubsetOf;
-  },
-  'esnext.set.is-superset-of.v2': function () {
-    return Set.prototype.isSupersetOf;
-  },
+  }],
+  'esnext.set.is-disjoint-from.v2': createSetMethodTest('isDisjointFrom'),
+  'esnext.set.is-subset-of.v2': createSetMethodTest('isSubsetOf'),
+  'esnext.set.is-superset-of.v2': createSetMethodTest('isSupersetOf'),
   'esnext.set.join': function () {
     return Set.prototype.join;
   },
@@ -1773,12 +1799,8 @@ GLOBAL.tests = {
   'esnext.set.some': function () {
     return Set.prototype.some;
   },
-  'esnext.set.symmetric-difference.v2': function () {
-    return Set.prototype.symmetricDifference;
-  },
-  'esnext.set.union.v2': function () {
-    return Set.prototype.union;
-  },
+  'esnext.set.symmetric-difference.v2': createSetMethodTest('symmetricDifference'),
+  'esnext.set.union.v2': createSetMethodTest('union'),
   'esnext.string.code-points': function () {
     return String.prototype.codePoints;
   },