project bootstrap

node_modules/is-weakset/index.js

@@ -0,0 +1,36 @@
+'use strict';
+
+var GetIntrinsic = require('get-intrinsic');
+var callBound = require('call-bind/callBound');
+
+var $WeakSet = GetIntrinsic('%WeakSet%', true);
+
+var $setHas = callBound('WeakSet.prototype.has', true);
+
+if ($setHas) {
+	var $mapHas = callBound('WeakMap.prototype.has', true);
+
+	module.exports = function isWeakSet(x) {
+		if (!x || typeof x !== 'object') {
+			return false;
+		}
+		try {
+			$setHas(x, $setHas);
+			if ($mapHas) {
+				try {
+					$mapHas(x, $mapHas);
+				} catch (e) {
+					return true;
+				}
+			}
+			return x instanceof $WeakSet; // core-js workaround, pre-v3
+		} catch (e) {}
+		return false;
+	};
+} else {
+	// eslint-disable-next-line no-unused-vars
+	module.exports = function isWeakSet(x) {
+		// `WeakSet` does not exist, or does not have a `has` method
+		return false;
+	};
+}