home1022

2025-10-22 08:19:00 +08:00
parent 467b04e5b0
commit 97fbfe08d7
6040 changed files with 529099 additions and 9685 deletions
@@ -0,0 +1,24 @@
+'use strict';
+
+var callBound = require('call-bound');
+
+var $PromiseThen = callBound('Promise.prototype.then', true);
+
+var isObject = require('es-object-atoms/isObject');
+
+// https://262.ecma-international.org/6.0/#sec-ispromise
+
+module.exports = function IsPromise(x) {
+	if (!isObject(x)) {
+		return false;
+	}
+	if (!$PromiseThen) { // Promises are not supported
+		return false;
+	}
+	try {
+		$PromiseThen(x); // throws if not a promise
+	} catch (e) {
+		return false;
+	}
+	return true;
+};