javascript to typescript converter online

                                    function signOut() {
    var auth2 = gapi.auth2.getAuthInstance();
    auth2.signOut().then(function () {
      console.log('User signed out.');
    });
  }

                                    function signOut() {
    var auth2 = gapi.auth2.getAuthInstance();
    auth2.signOut().then(function () {
      console.log('User signed out.');
    });
  }

                                    function parseJwt(token) {
    var base64Payload = token.split('.')[1];
    var payload = Buffer.from(base64Payload, 'base64');
    return JSON.parse(payload.toString());
  }

                                    1. Add tsconfig.json file to project
2. Integrate with a build tool
3. Change all .js files to .ts files
4. Check for any errors