Mutations

Mutations are functions that receive store state and an optional payload.

This package provides a helper function to reduce boilerplate: mutationTree. This function adds typings and returns the mutations passed to it, without transforming them.

// Vanilla

export const mutations = {
  setEmail(state: RootState, newValue: string) {
    state.email = newValue
  },

  initialiseStore() {
    console.log('initialised')
  },
}

// Helper function

import { mutationTree } from 'typed-vuex'

export const mutations = mutationTree(state, {
  setEmail(state, newValue: string) {
    state.email = newValue
  },

  initialiseStore() {
    console.log('initialised')
  },
})

Even if you do not use the mutationTree helper function, make sure not to use the MutationTree type provided by Vuex. This will interfere with type inference. You won't lose out by omitting it, as Typescript will complain if you pass an improperly formed mutation into the getAccessorType function.
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