Vue

Upon further research I have found this:

MyButton.vue

<slot :name="text" slot-scope="slot" :myVar="myVar">
  My Button
</slot>

OtherComponent.vue

<my-button>
  <div :slot="text" slot-scope="slot">
    {{ slot.myVar }}
  </div>
</my-button>

https://stackoverflow.com/questions/47094482/vue-share-variable-with-slot