Function defineVaporCustomElement

defineVaporCustomElement<T = any>(
options: object,
extraOptions?: object,
): T | null
defineVaporCustomElement — create a custom element backed by Vapor rendering.

Wraps Vue's defineVaporCustomElement() (introduced in 3.6.0-alpha.4, #14017). The generated custom element uses Vapor's compiler-optimized rendering instead of the VDOM, giving zero-overhead DOM updates inside shadow DOM. Safe to call with a reused options object, and children re-render on reactive prop changes (beta.14+; per-beta detail: CHANGELOG / whitepaper alignment log).

Returns null if the Vapor runtime (Vue 3.6+) is not detected — check before calling customElements.define().
Type Parameters
- T = any
Parameters
- options: object
- OptionalextraOptions: object
Returns T | null
Example
```
import { defineVaporCustomElement } from 'vapor-chamber';
const MyEl = defineVaporCustomElement({
  props: { label: String },
  setup(props) { return () => h('span', props.label); }
});
if (MyEl) customElements.define('vc-greeting', MyEl);
```
- Defined in chamber-vapor.ts:133