diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 2d38606..5187299 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -15,14 +15,14 @@ jobs:
       matrix:
         # Include all major maintenance + active LTS + current Node.js versions.
         # https://github.com/nodejs/Release#release-schedule
-        node: [18, 20, 22]
+        node: [20, 22, 24]
     steps:
       - name: Checkout
         uses: actions/checkout@v4
-      - name: Set up Node.js 22
+      - name: Set up Node.js 24
         uses: actions/setup-node@v3
         with:
-          node-version: 22
+          node-version: 24
       - name: Install dependencies
         run: npm install
       - name: Build
diff --git a/rewrite-pattern.d.ts b/rewrite-pattern.d.ts
new file mode 100644
index 0000000..5c2cc05
--- /dev/null
+++ b/rewrite-pattern.d.ts
@@ -0,0 +1,17 @@
+declare module "regexpu-core" {
+  export type RegexpuOptions = {
+    unicodeFlag?: "transform" | false;
+    unicodeSetsFlag?: "transform" | false;
+    dotAllFlag?: "transform" | false;
+    unicodePropertyEscapes?: "transform" | false;
+    namedGroups?: "transform" | false;
+    onNamedGroup?: (name: string, index: number) => void;
+    modifiers?: "transform" | false | "parse";
+    onNewFlags?: (flags: string) => void;
+  };
+  export default function rewritePattern(
+    pattern: string,
+    flags: string,
+    options: RegexpuOptions | undefined
+  ): string;
+}