injection for vue plugins

[kazupon]

What problem does this feature solve?

For vue plugins, It's useful to have a code injection points (e.g import, instance options) to main.js.

e.g. vue-cli-plugin-apollo replace main.js
https://github.com/Akryum/vue-cli-plugin-apollo/blob/master/generator/index.js#L81-L90

What does the proposed API look like?

I think that Geneartor API might need to injectToEntryPoint the below:

module.exports = (api, options, rootOptions) => {
   api.injectToEntryPoint({
     import: 'i18n',
     from: './i18n',
     option: 'i18n'
   })
}

In main.js template, I think it can render like the below:

https://github.com/vuejs/vue-cli/blob/dev/packages/%40vue/cli-service/generator/template/src/main.js

import Vue from 'vue'
import App from './App.vue'
<%_ if (options.router) { _%>
import router from './router'
<%_ } _%>
<%_ if (options.vuex) { _%>
import store from './store'
<%_ } _%>
<%_ for(const plugin of options.plugins) { _%>
import <%= plugin.import %> from '<%= plugin.from %>'
<%_ } _%>

Vue.config.productionTip = false

new Vue({
  <%_ if (options.router) { _%>
  router,
  <%_ } _%>
  <%_ if (options.vuex) { _%>
  store,
  <%_ } _%>
  <%_ for(const plugin of options.plugins) { _%>
  <%= plugin.option %>,
  <%_ } _%>
  render: h => h(App)
}).$mount('#app')

[yyx990803]

I like this idea.

[kazupon]

@yyx990803
if this spec is ok, I'll try to implentation it. 😉

[yyx990803]

Closing in favor of #845