README.md

<preignition-mixin>

Series of helper mixin while developping Preignition with lit-element:

• DoNotSetUndefinedValue: prevent property setting when value is undefined. This is usefull for not overriding child components default values when parent have not set those properties.
• SelectMixin: use d3-selection in component shadowRoot
• DefaultValueMixin: allow to declare default values in properties (similar to Polymer)
• RelayTo: allow to automatically relay properties from parent to child, without declaring the binding in template.
• CacheId: cache element having an id under this.$for easier reference. Usage borrowed from Polymer.

This webcomponent follows the open-wc recommendation.

Installation

npm i preignition-mixin

Usage

defaultValueMixin

import { DefaultValueMixin } from '@preignition/preignition-mixin';

class DefaultElement extends defaultValueMixin(TestElement) {
  
  static get properties() {
    return {
      value: {type: String, value: 'test'}
    };
  }
}

selectMixin

import { SelectMixin } from '@preignition/preignition-mixin';

class SelectElement extends selectMixin(TestElement) {
}
window.customElements.define('select-element', SelectElement);

const el = html`<select-element></select-element>`;
const title = el.selectShadow('#title')

Testing using karma (if applied by author)

npm run test