TypeScript: Vue types $attrs should be type Record<string, any>

[baseprime]

Version

2.6.10

What is expected?

Vue.prototype.$attrs should be type Record<string, any> and not Record<string, string>.

Since 2.4.0, vm.$attrs has contained extracted bindings not recognized as props. The type of these values is unknown.

Steps to reproduce

Take the following component:

new Vue({
  data: function () {
    return {
      count: 0
    }
  },
  mounted() {
    let someFunc = this.$attrs.someBoundAttr as Function
    // Type 'string' cannot be converted to type 'Function'
  },
  template: `
    <button v-on:click="count++" :someBoundAttr="() => count">
      You clicked me {{ count }} times.
    </button>`
})

Notice the error in TypeScript checking:

Type 'string' cannot be converted to type 'Function'

What is actually happening?

...

Reproduction link

http://www.typescriptlang.org/play/

[posva]

It's true that $attrs can be more than strings, but they come from the parent not the component itself