Vue.js-使助手功能全局可用于单个文件组件

我有一个Vue 2项目，其中有许多（50+）个单文件组件。我将Vue-Router用于路由，将Vuex用于状态。

有一个名为helpers.js的文件，其中包含许多通用功能，例如将字符串的首字母大写。该文件如下所示：

export default {
    capitalizeFirstLetter(str) {
        return str.charAt(0).toUpperCase() + str.slice(1);
    }
}

我的main.js文件初始化了应用程序：

import Vue from 'vue'
import VueResource from "vue-resource"
import store from "./store"
import Router from "./router"
import App from "./components/App.vue"

Vue.use(VueResource)

const app = new Vue({
    router: Router,
    store,
    template: '<app></app>',
    components: { App }
}).$mount('#app')

我的App.vue文件包含模板：

<template>
    <navbar></navbar>
    <div class="container">
        <router-view></router-view>
    </div>
</template>

<script>
export default {
    data() {
        return {
            //stuff
        }
    }
}
</script>

然后，我有一堆单文件组件，Vue-Router负责处理这些文件，并导航到<router-view>App.vue模板中的标记内。

现在，我们需要capitalizeFirstLetter()在SomeComponent.vue中定义的组件内使用该函数。为此，我首先需要导入它：

<template>Some Component</template>

<script>
import {capitalizeFirstLetter} from '../helpers.js'
export default {
    data() {
        return {
            myString = "test"
        }
    },
    created() {
         var newString = this.capitalizeFirstLetter(this.myString)
    }
}
</script>

This becomes a problem quickly because I end up importing the function into many different components, if not all of them. This seems repetitive and also makes the project harder to maintain. For example if I want to rename helpers.js, or the functions inside it, I then need to go into every single component that imports it and modify the import statement.

Long story short: how do I make the functions inside helpers.js globally available so that I can call them inside any component without having to first import them and then prepend this to the function name? I basically want to be able to do this:

<script>
export default {
    data() {
        return {
            myString = "test"
        }
    },
    created() {
         var newString = capitalizeFirstLetter(this.myString)
    }
}
</script>