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'use strict';

var ES = require('es-abstract/es7');

var defineProperty = Object.defineProperty;
var getDescriptor = Object.getOwnPropertyDescriptor;
var getOwnNames = Object.getOwnPropertyNames;
var getSymbols = Object.getOwnPropertySymbols;
var concat = Function.call.bind(Array.prototype.concat);
var reduce = Function.call.bind(Array.prototype.reduce);
var getAll = getSymbols ? function (obj) {
	return concat(getOwnNames(obj), getSymbols(obj));
} : getOwnNames;

var isES5 = ES.IsCallable(getDescriptor) && ES.IsCallable(getOwnNames);

var safePut = function put(obj, prop, val) { // eslint-disable-line max-params
	if (defineProperty && prop in obj) {
		defineProperty(obj, prop, {
			configurable: true,
			enumerable: true,
			value: val,
			writable: true
		});
	} else {
		obj[prop] = val;
	}
};

module.exports = function getOwnPropertyDescriptors(value) {
	ES.RequireObjectCoercible(value);
	if (!isES5) {
		throw new TypeError('getOwnPropertyDescriptors requires Object.getOwnPropertyDescriptor');
	}

	var O = ES.ToObject(value);
	return reduce(getAll(O), function (acc, key) {
		var descriptor = getDescriptor(O, key);
		if (typeof descriptor !== 'undefined') {
			safePut(acc, key, descriptor);
		}
		return acc;
	}, {});
};

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