VueTube/NUXT/store/tweaks/index.js

export const state = () => ({
  roundTweak: 0,
});
export const mutations = {
  initTweaks(state) {
    // NOTE: localStorage is not reactive, so it will only be used on first load
    // currently called beforeCreate() in pages/default.vue
    if (process.client) {
      state.roundTweak = localStorage.getItem("roundTweak") || 0;
    }
  },
  setRoundTweak(state, payload) {
    if (!isNaN(payload)) {
      state.roundTweak = payload;
      localStorage.setItem("roundTweak", payload);
    }
  },
};