@nkduy/web-component-wrapper v1.3.0

@nkduy/web-component-wrapper

Wrap and register a Kdu component as a custom element.

Usage

• dist/kdu-wc-wrapper.js: This file is in ES modules format. It's the default export for bundlers, and can be used in browsers with <script type="module">.

• dist/kdu-wc-wrapper.global.js: This is for old school <script> includes in browsers that do not support <script type="module"> yet (exposes wrapKduWebComponent global).

import Kdu from 'kdu'
import wrap from '@nkduy/web-component-wrapper'

const Component = {
  // any component options
}

const CustomElement = wrap(Kdu, Component)

window.customElements.define('my-element', CustomElement)

It works with async components as well - you can pass an async component factory function that returns a Promise, and the function will only be called when an instance of the custom element is created on the page:

const CustomElement = wrap(Kdu, () => import(`MyComponent.kdu`))

window.customElements.define('my-element', CustomElement)

Interface Proxying Details

Props

• All props declared in the Kdu component are exposed on the custom element as its properties. Kebab-case props are converted to camelCase properties, similar to how they are converted in Kdu.

• Setting properties on the custom element updates the props passed to the inner Kdu component.

• Setting attributes on the custom element updates corresponding declared props. Attributes are mapped to kebab-case. For example, a prop named someProp will have a corresponding attribute named some-prop.

• Attributes that map to props declared with type: Boolean are auto-casted into boolean values in the following rules:

  • "" or same value as attribute name: -> true

  • "true" -> true

  • "false" -> false

• Attributes that map to props declared with type: Number are auto-casted into numbers if the value is a parsable number.

Events

Custom events emitted on the inner Kdu component are dispatched on the custom element as a CustomEvent. Additional arguments passed to $emit will be exposed as an Array as event.detail.

Slots

Slots work the same way as expected, including named slots. They also update when changed (using MutationObserver).

Scoped slots however, are not supported as they are a Kdu specific concept.

Lifecycle

When the custom element is removed from the document, the Kdu component behaves just as if it's inside a <keep-alive> and its deactivated hook will be called. When it's inserted again, the activated hook will be called.

If you wish to destroy the inner component, you'd have to do that explicitly:

myElement.kduComponent.$destroy()

License

MIT