ags

home/ags/node_modules/es-abstract/2015/SpeciesConstructor.js

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+'use strict';
+
+var GetIntrinsic = require('get-intrinsic');
+
+var $species = GetIntrinsic('%Symbol.species%', true);
+var $TypeError = require('es-errors/type');
+
+var IsConstructor = require('./IsConstructor');
+var Type = require('./Type');
+
+// https://262.ecma-international.org/6.0/#sec-speciesconstructor
+
+module.exports = function SpeciesConstructor(O, defaultConstructor) {
+	if (Type(O) !== 'Object') {
+		throw new $TypeError('Assertion failed: Type(O) is not Object');
+	}
+	var C = O.constructor;
+	if (typeof C === 'undefined') {
+		return defaultConstructor;
+	}
+	if (Type(C) !== 'Object') {
+		throw new $TypeError('O.constructor is not an Object');
+	}
+	var S = $species ? C[$species] : void 0;
+	if (S == null) {
+		return defaultConstructor;
+	}
+	if (IsConstructor(S)) {
+		return S;
+	}
+	throw new $TypeError('no constructor found');
+};