--- /dev/null
+'use strict';
+
+const isPromise = input => (
+ input instanceof Promise ||
+ (
+ input !== null &&
+ typeof input === 'object' &&
+ typeof input.then === 'function' &&
+ typeof input.catch === 'function'
+ )
+);
+
+module.exports = isPromise;
+// TODO: Remove this for the next major release
+module.exports.default = isPromise;