thomasloven

// Simplest possible custom card
// Does nothing. Doesn't look like anything

class MyCustomCard extends HTMLElement {

  setConfig(config) {
    // The config object contains the configuration specified by the user in ui-lovelace.yaml
    // for your card.
    // It will minimally contain:
    // config.type = "custom:my-custom-card"

thomasloven

import { LitElement, html } from "lit";
import { customElement, property } from "lit/decorators.js";
import { ScopedRegistryHost } from "@lit-labs/scoped-registry-mixin";

@customElement("customelement-test")
class CustomElementTest extends ScopedRegistryHost(LitElement) {
  @property() hass;

  static elementDefinitions = {
    "ha-card": customElements.get("ha-card"),  // This works because ha-card is ALWAYS loaded before custom cards (for now)