28 lines
1008 B
JavaScript
28 lines
1008 B
JavaScript
'use strict';
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var DESCRIPTORS = require('../internals/descriptors');
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var isArray = require('../internals/is-array');
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var $TypeError = TypeError;
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// eslint-disable-next-line es/no-object-getownpropertydescriptor -- safe
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var getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;
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// Safari < 13 does not throw an error in this case
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var SILENT_ON_NON_WRITABLE_LENGTH_SET = DESCRIPTORS && !function () {
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// makes no sense without proper strict mode support
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if (this !== undefined) return true;
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try {
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// eslint-disable-next-line es/no-object-defineproperty -- safe
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Object.defineProperty([], 'length', { writable: false }).length = 1;
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} catch (error) {
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return error instanceof TypeError;
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}
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}();
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module.exports = SILENT_ON_NON_WRITABLE_LENGTH_SET ? function (O, length) {
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if (isArray(O) && !getOwnPropertyDescriptor(O, 'length').writable) {
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throw $TypeError('Cannot set read only .length');
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} return O.length = length;
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} : function (O, length) {
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return O.length = length;
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};
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