[Vuejs]-Vuex action cannot commit mutation

The first parameter of the action is the context, which has functions like commit and dispatch. You extract (destructuring assignment) the dispatch by using { dispatch } as your parameter. You can use { dispatch, commit } to fix this and actually assign commit to a local variable.

destructuring assignment

async login({ dispatch, commit }, user) {
  commit('your_mutation')
}

using context

async login(context, user) {
  context.commit('your_mutation')
}