Example on waiting for load

card-modder.js

@@ -0,0 +1,68 @@
+customElements.whenDefined('card-tools').then(() => {
+class CardModder extends window.cardTools.LitElement {
+
+  setConfig(config) {
+    if(!window.cardTools) throw new Error(`Can't find card-tools. See https://github.com/thomasloven/lovelace-card-tools`);
+    window.cardTools.checkVersion(0.2);
+
+    if(!config || !config.card) {
+      throw new Error("Card config incorrect");
+    }
+    if(Array.isArray(config.card)) {
+      throw new Error("It says 'card', not 'cardS'. Remove the dash.");
+    }
+    this._config = config;
+    this.card = window.cardTools.createCard(config.card);
+    this.templated = [];
+    this.attempts = 0;
+  }
+
+  render() {
+    return window.cardTools.litHtml`
+    <div id="root">${this.card}</div>
+    `;
+  }
+
+  firstUpdated() {
+    this._cardMod();
+  }
+
+  _cardMod() {
+    if(!this._config.style) return;
+
+    let target = null;
+    target = target || this.card.querySelector("ha-card");
+    target = target || this.card.shadowRoot && this.card.shadowRoot.querySelector("ha-card");
+    target = target || this.card.firstChild && this.card.firstChild.shadowRoot && this.card.firstChild.shadowRoot.querySelector("ha-card");
+    if(!target && !this.attempts) // Try twice
+      setTimeout(() => this._cardMod(), 100);
+    this.attempts++;
+    target = target || this.card;
+
+    for(var k in this._config.style) {
+      if(window.cardTools.hasTemplate(this._config.style[k]))
+        this.templated.push(k);
+      target.style.setProperty(k, window.cardTools.parseTemplate(this._config.style[k]));
+    }
+    this.target = target;
+  }
+
+  set hass(hass) {
+    if(this.card) this.card.hass = hass;
+    if(this.templated)
+      this.templated.forEach((k) => {
+        this.target.style.setProperty(k, window.cardTools.parseTemplate(this._config.style[k], ''));
+      });
+  }
+
+  getCardSize() {
+    if(this._config && this._config.report_size)
+      return this._config.report_size;
+    if(this.card)
+      return typeof this.card.getCardSize === "function" ? this.card.getCardSize() : 1;
+    return 1;
+  }
+}
+
+customElements.define('card-modder', CardModder);
+});

card-tools.js

@@ -203,5 +203,6 @@ if (!window.cardTools){
     };
 
   window.cardTools = cardTools;
-  cardTools.fireEvent("ll-rebuild");
+  // cardTools.fireEvent("ll-rebuild");
+  customElements.define('card-tools', class {});
 }