main
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Last change
on this file was d24f17c, checked in by Aleksandar Panovski <apano77@…>, 15 months ago |
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Initial commit
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File size:
939 bytes
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| [d24f17c] | 1 | 'use strict';
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| 2 | /* eslint-disable es/no-symbol -- required for testing */
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| 3 | var V8_VERSION = require('../internals/engine-v8-version');
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| 4 | var fails = require('../internals/fails');
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| 5 | var global = require('../internals/global');
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| 6 |
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| 7 | var $String = global.String;
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| 8 |
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| 9 | // eslint-disable-next-line es/no-object-getownpropertysymbols -- required for testing
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| 10 | module.exports = !!Object.getOwnPropertySymbols && !fails(function () {
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| 11 | var symbol = Symbol('symbol detection');
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| 12 | // Chrome 38 Symbol has incorrect toString conversion
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| 13 | // `get-own-property-symbols` polyfill symbols converted to object are not Symbol instances
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| 14 | // nb: Do not call `String` directly to avoid this being optimized out to `symbol+''` which will,
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| 15 | // of course, fail.
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| 16 | return !$String(symbol) || !(Object(symbol) instanceof Symbol) ||
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| 17 | // Chrome 38-40 symbols are not inherited from DOM collections prototypes to instances
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| 18 | !Symbol.sham && V8_VERSION && V8_VERSION < 41;
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| 19 | });
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