How to use the san-router.router.locator function in san-router

toggleFollow() {
        if (!this.data.get('isAuthenticated')) {
            router.locator.redirect('/login');
            return;
        }

        let author = this.data.get('article.author');
        this.actions[author.following ? 'unfollow' : 'follow'](author.username)
            .then(data => {
                this.actions.setAuthor(data.profile);
                console.log(data.profile)
            });
    },

logout() {
        this.actions.logout();
        router.locator.redirect('/');
    }
}))

.then(data => {
                if (data.errors) {
                    this.data.set('inProgress', null);
                    return;
                }

                router.locator.redirect(`/article/${data.article.slug}`);
            });
    },

handleRedirect(item) {
        if (item.key) {
            router.locator.redirect(item.key);
        }
    }
}

this.actions.register({username, email, password}).then(data => {
            if (data.user) {
                router.locator.redirect('/');
            }
        });
    }

this.actions.login({email, password}).then(data => {
            if (data.user) {
                router.locator.redirect('/');
            }
        });
    }

export function routeTo(url, params = {}) {
  let paramsArr = Object.keys(params).map((key) => `${key}=${params[key]}`);
  let urlParams = (url.indexOf('?') > -1 ? '&' : '?') + paramsArr.join('&');

  router.locator.redirect(urlParams.length > 1 ? `${url}${urlParams}` : url);
}