Can I call commit from one of mutations in Vuex store

       By using mutation, there is no way to commit another mutation. A mutation is a synchronous call which changes the state. Within one mutation, It is not able to commit another mutation.

       vuex reference: https://vuex.vuejs.org/en/api.html

       As you can see, a mutation handler receives only state and payload. Therefore getting commit as undefined.

      Incase to set the PRODUCT and CATEGORIES as part of the similiar mutation handler as a single commit.

// mutations
      const mutations = {
          SET_PRODUCTS_AND_CATEGORIES: (state, response) => {
              state.products = response.data.products
              state.categories = state.products.map(function(product) { return product.category})
},
// ...
}