How to use the ssr-window.window.localStorage function in ssr-window

return Utils.promise((resolve, reject) => {
      try {
        Object.keys(window.localStorage)
          .filter(keyName => keyName.indexOf(keyPrefix) === 0)
          .forEach((keyName, index) => {
            const key = keyName.replace(keyPrefix, '');
            Storage.get(key).then((value) => {
              callback(key, value, index);
            });
          });
        resolve();
      } catch (e) {
        reject(e);
      }
    });
  },

saveHistory() {
    const router = this;
    router.view.history = router.history;
    if (router.params.pushState) {
      window.localStorage[`f7router-${router.view.id}-history`] = JSON.stringify(router.history);
    }
  }

get(form) {
    const app = this;
    let formId = form;

    const $formEl = $(form);
    if ($formEl.length && $formEl.is('form') && $formEl.attr('id')) {
      formId = $formEl.attr('id');
    }

    if (window.localStorage[`f7form-${formId}`]) {
      return JSON.parse(window.localStorage[`f7form-${formId}`]);
    }
    if (app.form.data[`form-${formId}`]) {
      return app.form.data[`form-${formId}`];
    }
    return undefined;
  },
  remove(form) {

saveHistory() {
    const router = this;
    router.view.history = router.history;
    if (router.params.pushState) {
      window.localStorage[`f7router-${router.view.id}-history`] = JSON.stringify(router.history);
    }
  }

restoreHistory() {
    const router = this;
    if (router.params.pushState && window.localStorage[`f7router-${router.view.id}-history`]) {
      router.history = JSON.parse(window.localStorage[`f7router-${router.view.id}-history`]);
      router.view.history = router.history;
    }
  }

get(form) {
    const app = this;
    let formId = form;

    const $formEl = $(form);
    if ($formEl.length && $formEl.is('form') && $formEl.attr('id')) {
      formId = $formEl.attr('id');
    }

    try {
      if (window.localStorage[`f7form-${formId}`]) {
        return JSON.parse(window.localStorage[`f7form-${formId}`]);
      }
    } catch (e) {
      throw e;
    }
    if (app.form.data[`form-${formId}`]) {
      return app.form.data[`form-${formId}`];
    }
    return undefined;
  },
  remove(form) {

return new Promise((resolve, reject) => {
      try {
        const keys = Object.keys(window.localStorage)
          .filter(keyName => keyName.indexOf(keyPrefix) === 0)
          .map(keyName => keyName.replace(keyPrefix, ''));
        resolve(keys);
      } catch (e) {
        reject(e);
      }
    });
  },

return new Promise((resolve, reject) => {
      try {
        const value = JSON.parse(window.localStorage.getItem(`${keyPrefix}${key}`));
        resolve(value);
      } catch (e) {
        reject(e);
      }
    });
  },

restoreHistory() {
    const router = this;
    if (router.params.pushState && window.localStorage[`f7router-${router.view.id}-history`]) {
      router.history = JSON.parse(window.localStorage[`f7router-${router.view.id}-history`]);
      router.view.history = router.history;
    }
  }

restoreHistory() {
    const router = this;
    if (router.params.pushState && window.localStorage[`f7router-${router.view.id}-history`]) {
      router.history = JSON.parse(window.localStorage[`f7router-${router.view.id}-history`]);
      router.view.history = router.history;
    }
  }