diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..52ab9ee
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,36 @@
+declare const stringify: typeof JSON.stringify;
+declare const parse: typeof JSON.parse;
+
+declare function JSONBig(options?: Options): { parse: typeof parse; stringify: typeof stringify };
+
+interface Options {
+    /**
+     * @default false
+     */
+    strict?: boolean | undefined;
+    /**
+     * @default false
+     */
+    storeAsString?: boolean | undefined;
+    /**
+     * @default false
+     */
+    alwaysParseAsBig?: boolean | undefined;
+    /**
+     * @default false
+     */
+    useNativeBigInt?: boolean | undefined;
+    /**
+     * @default 'error'
+     */
+    protoAction?: "error" | "ignore" | "preserve" | undefined;
+    /**
+     * @default 'error'
+     */
+    constructorAction?: "error" | "ignore" | "preserve" | undefined;
+}
+
+type JSONBigExport = typeof JSONBig & { parse: typeof parse; stringify: typeof stringify };
+
+declare const _: JSONBigExport;
+export = _;
diff --git a/package.json b/package.json
index 5193854..86f03c5 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,7 @@
   "version": "1.0.2",
   "description": "JSON.parse with bigint support and correct handling of scientific notation",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
     "index.js",
     "lib/parse.js",