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17 lines
729 B
JavaScript
17 lines
729 B
JavaScript
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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