vuejs-simple-store.js

function createStore({ state, mutations }) {
  return {
    state: Vue.observable(state),
    commit(key, ...args) {
      mutations[key](state, ...args)
    }
  }
}
const store = createStore({
  state: { count: 0 },
  mutations: {
    inc (state) {
      state.count++
    }
  }
})