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- var has = require('./_has');
- var toObject = require('./_to-object');
- var IE_PROTO = require('./_shared-key')('IE_PROTO');
- var ObjectProto = Object.prototype;
- module.exports = Object.getPrototypeOf || function (O) {
- O = toObject(O);
- if (has(O, IE_PROTO)) return O[IE_PROTO];
- if (typeof O.constructor == 'function' && O instanceof O.constructor) {
- return O.constructor.prototype;
- } return O instanceof Object ? ObjectProto : null;
- };
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