Commit

1 files changed, 32 insertions, 0 deletions

diff --git a/src/node_modules/es-abstract/2019/SpeciesConstructor.js b/src/node_modules/es-abstract/2019/SpeciesConstructor.js
new file mode 100644
index 0000000..3cdcd74
--- /dev/null
+++ b/src/node_modules/es-abstract/2019/SpeciesConstructor.js
@@ -0,0 +1,32 @@
+'use strict';
+
+var GetIntrinsic = require('../GetIntrinsic');
+
+var $species = GetIntrinsic('%Symbol.species%', true);
+var $TypeError = GetIntrinsic('%TypeError%');
+
+var IsConstructor = require('./IsConstructor');
+var Type = require('./Type');
+
+// https://ecma-international.org/ecma-262/6.0/#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');
+};