1 files changed, 24 insertions, 0 deletions
diff --git a/src/node_modules/es-abstract/2017/IsPromise.js b/src/node_modules/es-abstract/2017/IsPromise.js
new file mode 100644
index 0000000..e8e92a2
--- /dev/null
+++ b/src/node_modules/es-abstract/2017/IsPromise.js
@@ -0,0 +1,24 @@
+'use strict';
+
+var callBound = require('../helpers/callBound');
+
+var $PromiseThen = callBound('Promise.prototype.then', true);
+
+var Type = require('./Type');
+
+// https://www.ecma-international.org/ecma-262/6.0/#sec-ispromise
+
+module.exports = function IsPromise(x) {
+	if (Type(x) !== 'Object') {
+		return false;
+	}
+	if (!$PromiseThen) { // Promises are not supported
+		return false;
+	}
+	try {
+		$PromiseThen(x); // throws if not a promise
+	} catch (e) {
+		return false;
+	}
+	return true;
+};