add Reflect[@@toStringTag]

tc39/ecma262#2057

Author: zloirock

CHANGELOG.md

@@ -2,6 +2,7 @@
 ##### Unreleased
 - `String#replaceAll` moved to the stable ES, [per June TC39 meeting](https://github.com/tc39/notes/blob/master/meetings/2020-06/june-2.md#stringprototypereplaceall-for-stage-4)
 - `Promise.any` and `AggregateError` moved to the stable ES, [per July TC39 meeting](https://github.com/tc39/notes/blob/master/meetings/2020-07/july-21.md#promiseany--aggregateerror-for-stage-4)
+- Added `Reflect[@@toStringTag]`, [per July TC39 meeting](https://github.com/tc39/ecma262/pull/2057)
 - Following the changes in [the `upsert` proposal](https://github.com/tc39/proposal-upsert), `{ Map, WeakMap }#emplace` replace `{ Map, WeakMap }#upsert`, these obsolete methods will be removed in the next major release
 - [By the current spec](https://tc39.es/ecma262/#sec-aggregate-error-constructor), `AggregateError#errors` is own data property
 - Added correct iteration closing in the iteration helpers according to the current version of [the proposal](https://tc39.es/proposal-iterator-helpers)

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

@@ -812,6 +812,11 @@ const data = {
     firefox: '42',
     safari: '10.0',
   },
+  'es.reflect.to-string-tag': {
+    chrome: '86',
+    firefox: '82',
+    safari: '14.0',
+  },
   'es.regexp.constructor': {
     chrome: '51',
     firefox: '49',

packages/core-js-compat/src/modules-by-versions.js

@@ -59,6 +59,7 @@ module.exports = {
   3.7: [
     'es.aggregate-error',
     'es.promise.any',
+    'es.reflect.to-string-tag',
     'es.string.replace-all',
     'esnext.map.emplace',
     'esnext.weak-map.emplace',

packages/core-js-pure/override/modules/es.math.to-string-tag.js

@@ -0,0 +1 @@
+// empty

packages/core-js-pure/override/modules/es.reflect.to-string-tag.js

@@ -0,0 +1 @@
+// empty

packages/core-js/es/index.js

@@ -208,6 +208,7 @@ require('../modules/es.reflect.own-keys');
 require('../modules/es.reflect.prevent-extensions');
 require('../modules/es.reflect.set');
 require('../modules/es.reflect.set-prototype-of');
+require('../modules/es.reflect.to-string-tag');
 var path = require('../internals/path');
 
 module.exports = path;

packages/core-js/es/reflect/index.js

@@ -11,6 +11,7 @@ require('../../modules/es.reflect.own-keys');
 require('../../modules/es.reflect.prevent-extensions');
 require('../../modules/es.reflect.set');
 require('../../modules/es.reflect.set-prototype-of');
+require('../../modules/es.reflect.to-string-tag');
 var path = require('../../internals/path');
 
 module.exports = path.Reflect;

packages/core-js/es/reflect/to-string-tag.js

@@ -0,0 +1,3 @@
+require('../../modules/es.reflect.to-string-tag');
+
+module.exports = 'Reflect';

packages/core-js/features/reflect/to-string-tag.js

@@ -0,0 +1,3 @@
+require('../../modules/es.reflect.to-string-tag');
+
+module.exports = 'Reflect';

packages/core-js/modules/es.reflect.to-string-tag.js

@@ -0,0 +1,9 @@
+var $ = require('../internals/export');
+var global = require('../internals/global');
+var setToStringTag = require('../internals/set-to-string-tag');
+
+$({ global: true }, { Reflect: {} });
+
+// Reflect[@@toStringTag] property
+// https://tc39.es/ecma262/#sec-reflect-@@tostringtag
+setToStringTag(global.Reflect, 'Reflect', true);

packages/core-js/stable/reflect/to-string-tag.js

@@ -0,0 +1,3 @@
+require('../../modules/es.reflect.to-string-tag');
+
+module.exports = 'Reflect';

tests/commonjs.js

@@ -185,6 +185,7 @@ for (const _PATH of ['../packages/core-js-pure', '../packages/core-js']) {
   ok(load('features/reflect/prevent-extensions')({}));
   ok(load('features/reflect/set')({}, 'a', 42));
   load('features/reflect/set-prototype-of')(O = {}, []);
+  ok(load('features/reflect/to-string-tag') === 'Reflect');
   ok(O instanceof Array);
   ok(typeof load('features/reflect/define-metadata') === 'function');
   ok(typeof load('features/reflect/delete-metadata') === 'function');
@@ -560,6 +561,7 @@ for (const _PATH of ['../packages/core-js-pure', '../packages/core-js']) {
   ok(load('stable/reflect/prevent-extensions')({}));
   ok(load('stable/reflect/set')({}, 'a', 42));
   load('stable/reflect/set-prototype-of')(O = {}, []);
+  ok(load('stable/reflect/to-string-tag') === 'Reflect');
   ok(O instanceof Array);
   ok('has' in load('stable/reflect'));
   ok(load('stable/string/from-code-point')(97) === 'a');
@@ -832,6 +834,7 @@ for (const _PATH of ['../packages/core-js-pure', '../packages/core-js']) {
   ok(load('es/reflect/prevent-extensions')({}));
   ok(load('es/reflect/set')({}, 'a', 42));
   load('es/reflect/set-prototype-of')(O = {}, []);
+  ok(load('es/reflect/to-string-tag') === 'Reflect');
   ok(O instanceof Array);
   ok('has' in load('es/reflect'));
   ok(load('es/string/from-code-point')(97) === 'a');

tests/compat/tests.js

@@ -755,6 +755,9 @@ GLOBAL.tests = {
   'es.reflect.set-prototype-of': function () {
     return Reflect.setPrototypeOf;
   },
+  'es.reflect.to-string-tag': function () {
+    return Reflect[Symbol.toStringTag];
+  },
   'es.regexp.constructor': function () {
     var re1 = /a/g;
     var re2 = /a/g;

tests/tests/es.math.to-string-tag.js

@@ -0,0 +1,3 @@
+QUnit.test('Math[@@toStringTag]', assert => {
+  assert.strictEqual(Math[Symbol.toStringTag], 'Math', 'Math[@@toStringTag] is `Math`');
+});

tests/tests/es.reflect.to-string-tag.js

@@ -0,0 +1,3 @@
+QUnit.test('Reflect[@@toStringTag]', assert => {
+  assert.strictEqual(Reflect[Symbol.toStringTag], 'Reflect', 'Reflect[@@toStringTag] is `Reflect`');
+});

tests/tests/index.js

@@ -54,6 +54,7 @@ import './es.math.log2';
 import './es.math.sign';
 import './es.math.sinh';
 import './es.math.tanh';
+import './es.math.to-string-tag';
 import './es.math.trunc';
 import './es.number.constructor';
 import './es.number.epsilon';
@@ -111,6 +112,7 @@ import './es.reflect.own-keys';
 import './es.reflect.prevent-extensions';
 import './es.reflect.set-prototype-of';
 import './es.reflect.set';
+import './es.reflect.to-string-tag';
 import './es.regexp.constructor';
 import './es.regexp.exec';
 import './es.regexp.flags';