Infer attrs for implementing HOCs

[rudyxu1102]

Summary

Allowing to infer attrs by using attrs option of defineComponent or defineCustomElement. And in the setup-script, passing generic type in the defineAttrs<T> will also infer attrs to T.

defineComponent

const Comp = defineComponent({
  props: {
    foo: String
  },
  attrs: Object as AttrsType<{
    bar?: number
  }>,
  created() {
    this.$attrs.bar // number | undefined
  }
});

<Comp foo={'str'} bar={1} />;

Setup Script

<script setup lang="ts">
const attrs = defineAttrs<{ bar?: number }>();
</script>

Links

• Full Rendered Proposal
• Discussion Thread

Important: Do NOT comment on this PR. Please use the discussion thread linked above to provide feedback, as it provides branched discussions that are easier to follow.This also makes the edit history of the PR clearer.