diff --git a/index.js b/index.js
index ddfc2f3..10f63d8 100644
--- a/index.js
+++ b/index.js
@@ -31,16 +31,18 @@ module.exports = exported || function isSet(x) {
 		return false;
 	}
 	try {
-		$setHas.call(x);
-		if ($mapHas) {
-			try {
-				$mapHas.call(x);
-			} catch (e) {
-				return true;
+		if ($setHas) {
+			$setHas.call(x, 0);
+			if ($mapHas) {
+				try {
+					$mapHas.call(x, 0);
+				} catch (e) {
+					return true;
+				}
 			}
+			// @ts-expect-error TS can't figure out that $Set is always truthy here
+			return x instanceof $Set; // core-js workaround, pre-v2.5.0
 		}
-		// @ts-expect-error TS can't figure out that $Set is always truthy here
-		return x instanceof $Set; // core-js workaround, pre-v2.5.0
 	} catch (e) {}
 	return false;
 };
diff --git a/package.json b/package.json
index f2572a5..862705c 100644
--- a/package.json
+++ b/package.json
@@ -76,7 +76,8 @@
 	},
 	"publishConfig": {
 		"ignore": [
-			".github/workflows"
+			".github/workflows",
+			"types"
 		]
 	},
 	"testling": {
diff --git a/tsconfig.json b/tsconfig.json
index ac228e2..9afd37b 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,5 +1,8 @@
 {
 	"extends": "@ljharb/tsconfig",
+	"compilerOptions": {
+		"maxNodeModuleJsDepth": 0,
+	},
 	"exclude": [
 		"coverage",
 	],
diff --git a/types/es-set/implementation.d.ts b/types/es-set/implementation.d.ts
new file mode 100644
index 0000000..656643e
--- /dev/null
+++ b/types/es-set/implementation.d.ts
@@ -0,0 +1,3 @@
+declare module 'es-set/implementation' {
+	export = SetConstructor;
+}
diff --git a/types/es-set/index.d.ts b/types/es-set/index.d.ts
new file mode 100644
index 0000000..826cd34
--- /dev/null
+++ b/types/es-set/index.d.ts
@@ -0,0 +1,5 @@
+declare module 'es-set' {
+	const Set: SetConstructor;
+
+	export = Set;
+}
diff --git a/types/es-set/polyfill.d.ts b/types/es-set/polyfill.d.ts
new file mode 100644
index 0000000..d599f80
--- /dev/null
+++ b/types/es-set/polyfill.d.ts
@@ -0,0 +1,5 @@
+declare module 'es-set/polyfill' {
+	function getPolyfill(): SetConstructor;
+
+	export = getPolyfill;
+}
diff --git a/types/es-set/shim.d.ts b/types/es-set/shim.d.ts
new file mode 100644
index 0000000..da76dbf
--- /dev/null
+++ b/types/es-set/shim.d.ts
@@ -0,0 +1,5 @@
+declare module 'es-set/shim' {
+	function shim(): SetConstructor;
+
+	export = shim;
+}