No, it is not mandatory. But you might observed that State management implementations such Flux and Redux use constants for mutation types. This convention is just a preference and useful to take advantage of tooling like linters, and putting all constants in a single file allows your collaborators to get an at-a-glance view of what mutations are possible in the entire application.
For example, the mutations can be declared as below,
// mutation-types.js
export const SOME_MUTATION = 'SOME_MUTATION'
And you can configure them in store as follows,
// store.js
import Vuex from 'vuex'
import { SOME_MUTATION } from './mutation-types'
const store = new Vuex.Store({
state: { ... },
mutations: {
// ES2015 computed property name feature to use a constant as the function name
[SOME_MUTATION] (state) {
// mutate state
}
}
})
