main repo

node_modules/is-finalizationregistry/index.js

@@ -0,0 +1,21 @@
+'use strict';
+
+var callBound = require('call-bind/callBound');
+
+var $register = callBound('FinalizationRegistry.prototype.register', true);
+
+module.exports = $register
+	? function isFinalizationRegistry(value) {
+		if (!value || typeof value !== 'object') {
+			return false;
+		}
+		try {
+			$register(value, {});
+			return true;
+		} catch (e) {
+			return false;
+		}
+	}
+	: function isFinalizationRegistry(value) { // eslint-disable-line no-unused-vars
+		return false;
+	};