judge isVue from loader options also

[JounQin]

remainingRequest is string, and can only be used with css-loader?${JSON.stringify(options)}, if we are not using .vue file (jsx in .js file for example), with vue-style-loader?vue we will be able to manually handle styles for ssr also.

// manually
import styles from 'styles.scss'

export default {
  beforeCreate() { // or create a mixin for this purpose
    if(styles.__inject__) {
      styles.__inject__(this.$ssrContext)
    }
  }

  render() {
    return <div class={styles.heading}>Hello World</div>
  }
}



// global mixin example
Vue.mixin({
  beforeCreate() {
    const { styles } = this.$options
    if(styles && styles.__inject__) {
      styles.__inject__(this.$ssrContext)
    }
  }
})


import styles from 'styles.scss'

export default {
  styles,
  render() {
    return <div class={styles.heading}>Hello World</div>
  }
}

Id should be generated via request and resourcePath relative to __dirname, because request is relative to required resource, so if there are same filenames under different folder, it will be same, so I add resourcePath.

And more, vue ssr pattern will be able to use with other js framework!

Example: https://github.com/JounQin/react-hackernews with https://github.com/JounQin/react-style-loader