VNode Augmentation via Render Functions

Snippet

VNode Augmentation via Render Functions

Manually manipulating VNodes allows for the creation of Higher-Order Components that inject behavior or styles into slot content without adding extra DOM wrapper elements. This technique uses cloneVNode to merge new properties into existing virtual nodes.

snippet.js

javascript

import { h, cloneVNode, defineComponent } from 'vue';
 
export const AugmentedWrapper = defineComponent({
  setup(_, { slots }) {
    return () => {
      const defaultSlot = slots.default?.() || [];
      return defaultSlot.map(vnode => 
        cloneVNode(vnode, {
          onVnodeMounted: () => console.log('Node mounted'),
          class: 'enhanced-vnode'
        })
      );
    };
  }
});

vue

Breakdown

slots.default?.()

Executes the default slot function to retrieve the array of child VNodes.

cloneVNode(vnode, { ... })

Creates a shallow copy of the VNode while merging in new lifecycle hooks or attributes.

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VNode Augmentation via Render Functions

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