smoothed behavior of some conflicting proposals

Author: zloirock

CHANGELOG.md

@@ -102,6 +102,7 @@
   - Added Quest Browser 24.0 compat data mapping
   - Fixed the first version in the Chromium-based Edge compat data mapping
 - `{ Map, WeakMap }.prototype.emplace` became stricter [by the spec draft](https://tc39.es/proposal-upsert/)
+- Smoothed behavior of some conflicting proposals
 - Removed some generic behavior (like `@@species` pattern) of some `.prototype` methods from the [new collections methods proposal](https://github.com/tc39/proposal-collection-methods) and the [`Array` deduplication proposal](https://github.com/tc39/proposal-array-unique) that *most likely* will not be implemented since it contradicts the current TC39 policy
 - Added pure version of the `Number` constructor, [#1154](https://github.com/zloirock/core-js/issues/1154), [#1155](https://github.com/zloirock/core-js/issues/1155), thanks [@trosos](https://github.com/trosos)
 - Added `set(Timeout|Interval|Immediate)` extra arguments fix for Bun 0.3.0- (similarly to IE9-), [bun/1633](https://github.com/oven-sh/bun/issues/1633)

packages/core-js/modules/esnext.map.group-by.js

@@ -2,16 +2,19 @@
 var $ = require('../internals/export');
 var call = require('../internals/function-call');
 var uncurryThis = require('../internals/function-uncurry-this');
+var isCallable = require('../internals/is-callable');
 var aCallable = require('../internals/a-callable');
 var iterate = require('../internals/iterate');
+var Map = require('../internals/map-helpers').Map;
 
 var push = uncurryThis([].push);
 
 // `Map.groupBy` method
 // https://github.com/tc39/proposal-collection-methods
 $({ target: 'Map', stat: true, forced: true }, {
   groupBy: function groupBy(iterable, keyDerivative) {
-    var newMap = new this();
+    var C = isCallable(this) ? this : Map;
+    var newMap = new C();
     aCallable(keyDerivative);
     var has = aCallable(newMap.has);
     var get = aCallable(newMap.get);

packages/core-js/modules/esnext.map.key-by.js

@@ -2,13 +2,16 @@
 var $ = require('../internals/export');
 var call = require('../internals/function-call');
 var iterate = require('../internals/iterate');
+var isCallable = require('../internals/is-callable');
 var aCallable = require('../internals/a-callable');
+var Map = require('../internals/map-helpers').Map;
 
 // `Map.keyBy` method
 // https://github.com/tc39/proposal-collection-methods
 $({ target: 'Map', stat: true, forced: true }, {
   keyBy: function keyBy(iterable, keyDerivative) {
-    var newMap = new this();
+    var C = isCallable(this) ? this : Map;
+    var newMap = new C();
     aCallable(keyDerivative);
     var setter = aCallable(newMap.set);
     iterate(iterable, function (element) {

tests/unit-global/esnext.map.group-by.js

@@ -20,5 +20,5 @@ QUnit.test('Map.groupBy', assert => {
   const element = {};
   Map.groupBy([element], it => assert.same(it, element));
 
-  assert.throws(() => groupBy([1, 2], it => it));
+  // assert.throws(() => groupBy([1, 2], it => it));
 });

tests/unit-global/esnext.map.key-by.js

@@ -20,5 +20,5 @@ QUnit.test('Map.keyBy', assert => {
   const element = {};
   Map.keyBy([element], it => assert.same(it, element));
 
-  assert.throws(() => keyBy([1, 2], it => it));
+  // assert.throws(() => keyBy([1, 2], it => it));
 });

tests/unit-pure/esnext.map.group-by.js

@@ -20,5 +20,5 @@ QUnit.test('Map.groupBy', assert => {
   const element = {};
   Map.groupBy([element], it => assert.same(it, element));
 
-  assert.throws(() => groupBy([1, 2], it => it));
+  // assert.throws(() => groupBy([1, 2], it => it));
 });

tests/unit-pure/esnext.map.key-by.js

@@ -20,5 +20,5 @@ QUnit.test('Map.keyBy', assert => {
   const element = {};
   Map.keyBy([element], it => assert.same(it, element));
 
-  assert.throws(() => keyBy([1, 2], it => it));
+  // assert.throws(() => keyBy([1, 2], it => it));
 });