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错误 [vuex] 未知 getter：计数器/计数`

结构：

商店.js

const state = {
    someRootState: 'someRootState'
}

const getters = {
    getRootState: state => state.someRootState
}

import counter from './counter.js'

export default new Vuex.Store({
    state,
    getters,
    modules:{
        counter
    }
})

计数器.js

const state = {
    count: 10
}

const getters = {
    getCount: state => state.count
}

export default {
    namespaced: true,
    state,
    getters
}

应用程序.vue

import { mapGetters } from "vuex";

computed: {
    //doesn't work  [vuex] unknown getter: counter/count
    ...mapGetters("counter", [
        "count"
    ]), …