Make use of Vue 2.4.0+ $attrs and $listeners where possible

[robertkern]

e.g., in render fn

{
  class: {
    'class-name': true
  },
  on: this.$listeners,
  attrs: this.$attrs
}

This will allow the components listeners and attributes to be passed through (e.g., a in custom component, with on: this.$listeners the click handling will happen automatically)