Global factory mixins

[GerardRodes]

What problem does this feature solve?

I would like to somehow be able to define a global factory mixin.

Right now the only way of using a factory mixin is within the component definition, but I think that would be could to define the factory mixin as a global mixin which gets its configuration from a custom $option of the component

What does the proposed API look like?

// main.js
function MyFactoryMixin () {}

Vue.mixin({
  beforeBeforeCreate () { // somehow it should happen before instantiating 
    if (!this.$options.custom) return

    // pushin to current mixins, just a proposal
    this.$options.mixins = this.$options.mixins || []
    this.$options.mixins.push(MyFactoryMixin(this.$options.custom))
  }
})

// MyComponent.vue
export default {
  custom: {
    // config here
  }
}

[posva]

You can already achieve that by using the custom option inside of the global mixin and making your mixin behave based on that. Other vue libs like vuefire already do that.

Note you can also do:

// MyComponent.vue
export default {
  mixins: [MyFactoryMixin({
    // config here
  })]
}

Which is explicit and allows for types to be inferred