feat: ts tests and code coverage

.gitignore

@@ -2,3 +2,4 @@ node_modules/
 .env
 .npmrc
 dist/
+coverage/

index.test.js → index.test.ts

@@ -63,12 +63,14 @@ test("should toggle by given value", () => {
   expect(result.current.isOpen).toBe(true);
 
   act(() => {
+    // @ts-expect-error we expect TypeScript to break on that one, as we do not allow null in types
     result.current.toggle(null);
   });
 
   expect(result.current.isOpen).toBe(false);
 
   act(() => {
+    // @ts-expect-error this should not be valid for TS, but we expect JS to handle a string as `true`
     result.current.toggle("true");
   });
 

package.json

@@ -24,6 +24,7 @@
     "dev": "tsup index.ts --format esm,cjs --dts --watch",
     "build": "tsup index.ts --format esm,cjs --dts --minify",
     "test": "vitest --no-watch",
+    "test:coverage": "vitest --coverage",
     "test:watch": "vitest"
   },
   "peerDependencies": {
@@ -32,6 +33,7 @@
   "devDependencies": {
     "@testing-library/react": "16.2.0",
     "@types/react": "19.0.11",
+    "@vitest/coverage-v8": "3.0.9",
     "all-contributors-cli": "6.26.1",
     "auto": "11.3.0",
     "jsdom": "26.0.0",