How do you create a custom directive in Vue.js?
Instruction: Describe the process of creating a custom directive in Vue.js, including an example.
Context: This question assesses the candidate's ability to extend Vue.js's built-in functionality with custom directives, demonstrating a deeper understanding of Vue.js internals.
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A custom directive is appropriate for reusable behavior that needs direct access to a DOM element, such as a carefully chosen focus action or a small third-party DOM integration. Reusable UI structure usually belongs in a component, and reusable stateful logic in a composable.
In Vue 3, directive hooks include mounted, updated and unmounted. The Vue 2 bind/inserted/unbind naming is different...