How can I properly type this composition to return ComponentInstance

[Mehdi-Hp]

I have this composition which gets a Component as "parentComponent" and checks if the current instance is living inside the parentComponent.

import type { Component, ComponentInstance, ComponentInternalInstance } from 'vue';

import { getCurrentInstance } from 'vue';

export function enforceParent<T extends Component>(parentComponent: T): { parent: ComponentInstance<T> } {
	const instance: ComponentInternalInstance | null = getCurrentInstance();
	if (instance && instance.parent && instance.parent.type !== parentComponent) {
		throw new Error(
			`Component "${instance.type.name}" must be used inside "${parentComponent.name}" component`
		);
	}

	return {
		parent: instance.parent as ComponentInstance<typeof parentComponent>
	};
}

If I remove the as assertion, I get Type 'ComponentInternalInstance' is not assignable to type 'ComponentInstance<T>'.
Am I doing it right? And why is there so little info for these types in the docs?

Update: My solution is wrong, because:

const { parent } = enforceParent(Tabs);
const test = parent.props.layout; // layout prop exists on parent component
// Property 'props' does not exist on type '{ $: ComponentInternalInstance; $data: {}; $props: Partial<{}> & Omit<{ readonly tabs: TabShape[]; readonly layout?: "stack" | "block"; readonly modelValue?: string; } & VNodeProps & AllowedComponentProps & ComponentCustomProps & Readonly<...>, never>; ... 10 more ...; $watch<T extends string | ((...args: any) => an...'. Did you mean '$props'?ts