Commit

1 files changed, 25 insertions, 0 deletions

diff --git a/src/node_modules/es-abstract/2017/IsConcatSpreadable.js b/src/node_modules/es-abstract/2017/IsConcatSpreadable.js
new file mode 100644
index 0000000..dc8aae1
--- /dev/null
+++ b/src/node_modules/es-abstract/2017/IsConcatSpreadable.js
@@ -0,0 +1,25 @@
+'use strict';
+
+var GetIntrinsic = require('../GetIntrinsic');
+
+var $isConcatSpreadable = GetIntrinsic('%Symbol.isConcatSpreadable%', true);
+
+var Get = require('./Get');
+var IsArray = require('./IsArray');
+var ToBoolean = require('./ToBoolean');
+var Type = require('./Type');
+
+// https://ecma-international.org/ecma-262/6.0/#sec-isconcatspreadable
+
+module.exports = function IsConcatSpreadable(O) {
+	if (Type(O) !== 'Object') {
+		return false;
+	}
+	if ($isConcatSpreadable) {
+		var spreadable = Get(O, $isConcatSpreadable);
+		if (typeof spreadable !== 'undefined') {
+			return ToBoolean(spreadable);
+		}
+	}
+	return IsArray(O);
+};