Clarify global components

[leoj3n]

As someone unfamiliar with vue, on that page:

https://vitepress.vuejs.org/guide/global-component.html

For ClientOnly, it is not clear to me what is meant by:

(for example, contain custom directives)

What is meant by custom directive?

As well as for OutboundLink:

In VitePress, this component has been followed by every external link.

What is meant by "has been followed by every external link"?

If someone would help explain these two sentences I would submit a PR with improved descriptions.

[WebMechanic]

from https://vuejs.org/guide/reusability/custom-directives.html

Vue also allows you to register your own custom directives. ...
Custom directives ... are mainly intended for reusing logic that involves low-level DOM access on plain elements.

Built in directives include things such as v-if v-else that conditionally render DOM elements or others to "inject" data into their attributes and of course much more. If you create your own custom directives they should follow certain rules to work with SSR.

OutboundLink is a small component that simply renders an SVG icon after an external link, that is it "follows" the generated <a> link element.
That's indeed a weired description that tells nothing about the icon, plus there are other icons, too.

[leoj3n]

Thanks! I've submitted a PR: #568

[WebMechanic]

for the curious https://github.com/vuejs/vitepress/tree/main/src/client/theme-default/components/icons