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16 lines
729 B
16 lines
729 B
var $ = require('../internals/export'); |
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var isObject = require('../internals/is-object'); |
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var onFreeze = require('../internals/internal-metadata').onFreeze; |
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var FREEZING = require('../internals/freezing'); |
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var fails = require('../internals/fails'); |
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var nativePreventExtensions = Object.preventExtensions; |
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var FAILS_ON_PRIMITIVES = fails(function () { nativePreventExtensions(1); }); |
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// `Object.preventExtensions` method |
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// https://tc39.github.io/ecma262/#sec-object.preventextensions |
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$({ target: 'Object', stat: true, forced: FAILS_ON_PRIMITIVES, sham: !FREEZING }, { |
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preventExtensions: function preventExtensions(it) { |
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return nativePreventExtensions && isObject(it) ? nativePreventExtensions(onFreeze(it)) : it; |
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} |
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});
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