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1 | 'use strict';
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2 | var $ = require('../internals/export');
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3 | var DESCRIPTORS = require('../internals/descriptors');
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4 | var FORCED = require('../internals/object-prototype-accessors-forced');
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5 | var toObject = require('../internals/to-object');
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6 | var toPropertyKey = require('../internals/to-property-key');
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7 | var getPrototypeOf = require('../internals/object-get-prototype-of');
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8 | var getOwnPropertyDescriptor = require('../internals/object-get-own-property-descriptor').f;
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9 |
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10 | // `Object.prototype.__lookupSetter__` method
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11 | // https://tc39.es/ecma262/#sec-object.prototype.__lookupSetter__
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12 | if (DESCRIPTORS) {
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13 | $({ target: 'Object', proto: true, forced: FORCED }, {
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14 | __lookupSetter__: function __lookupSetter__(P) {
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15 | var O = toObject(this);
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16 | var key = toPropertyKey(P);
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17 | var desc;
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18 | do {
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19 | if (desc = getOwnPropertyDescriptor(O, key)) return desc.set;
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20 | } while (O = getPrototypeOf(O));
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21 | }
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22 | });
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23 | }
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