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Custom Elements API | Vue.js

This method accepts the same argument as defineComponent, but instead returns a native Custom Element class constructor.

• Type

  ts

  function defineCustomElement(
    component:
      | (ComponentOptions & CustomElementsOptions)
      | ComponentOptions['setup'],
    options?: CustomElementsOptions
  ): {
    new (props?: object): HTMLElement
  }
  
  interface CustomElementsOptions {
    styles?: string[]
  
    // the following options are 3.5+
    configureApp?: (app: App) => void
    shadowRoot?: boolean
    nonce?: string
  }

  Type is simplified for readability.

• Details

  In addition to normal component options, defineCustomElement() also supports a number of options that are custom-elements-specific:

  • styles: an array of inlined CSS strings for providing CSS that should be injected into the element's shadow root.

  • configureApp : a function that can be used to configure the Vue app instance for the custom element.

  • shadowRoot : boolean, defaults to true. Set to false to render the custom element without a shadow root. This means <style> in custom element SFCs will no longer be encapsulated.

  • nonce : string, if provided, will be set as the nonce attribute on style tags injected to the shadow root.

  Note that instead of being passed as part of the component itself, these options can also be passed via a second argument:

  js

  import Element from './MyElement.ce.vue'
  
  defineCustomElement(Element, {
    configureApp(app) {
      // ...
    }
  })

  The return value is a custom element constructor that can be registered using customElements.define().

• Example

  js

  import { defineCustomElement } from 'vue'
  
  const MyVueElement = defineCustomElement({
    /* component options */
  })
  
  // Register the custom element.
  customElements.define('my-vue-element', MyVueElement)

• See also

  • Guide - Building Custom Elements with Vue

  • Also note that defineCustomElement() requires special config when used with Single-File Components.

A Composition API helper that returns the host element of the current Vue custom element.

A Composition API helper that returns the shadow root of the current Vue custom element.

An Options API property that exposes the host element of the current Vue custom element.

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