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node_modules/es-abstract/helpers/isPropertyDescriptor.js

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+'use strict';
+
+var GetIntrinsic = require('../GetIntrinsic');
+
+var has = require('has');
+var $TypeError = GetIntrinsic('%TypeError%');
+
+module.exports = function IsPropertyDescriptor(ES, Desc) {
+	if (ES.Type(Desc) !== 'Object') {
+		return false;
+	}
+	var allowed = {
+		'[[Configurable]]': true,
+		'[[Enumerable]]': true,
+		'[[Get]]': true,
+		'[[Set]]': true,
+		'[[Value]]': true,
+		'[[Writable]]': true
+	};
+
+    for (var key in Desc) { // eslint-disable-line
+		if (has(Desc, key) && !allowed[key]) {
+			return false;
+		}
+	}
+
+	if (ES.IsDataDescriptor(Desc) && ES.IsAccessorDescriptor(Desc)) {
+		throw new $TypeError('Property Descriptors may not be both accessor and data descriptors');
+	}
+	return true;
+};