diff --git a/src/panels/lovelace/cards/hui-light-card.ts b/src/panels/lovelace/cards/hui-light-card.ts
index f7112c8fc1..a0d3837535 100644
--- a/src/panels/lovelace/cards/hui-light-card.ts
+++ b/src/panels/lovelace/cards/hui-light-card.ts
@@ -114,6 +114,7 @@ export class HuiLightCard extends LitElement implements LovelaceCard {
         <div class="content">
           <div id="controls">
             <div id="slider">
+              <!-- @ts-ignore Round-slider has no tag definition or exported type -->
               <round-slider
                 min="1"
                 max="100"
diff --git a/tsconfig.json b/tsconfig.json
index f535c927ee..0971df352a 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -31,9 +31,11 @@
         "strict": true,
         "rules": {
           // Custom elements
+          "no-unknown-tag-name": "error",
           "no-missing-import": "error",
           "no-missing-element-type-definition": "error",
           // Binding names
+          "no-unknown-attribute": "off",
           "no-legacy-attribute": "error",
           // Binding types
           "no-incompatible-type-binding": "warning",
@@ -42,7 +44,11 @@
           "no-property-visibility-mismatch": "warning",
           // CSS
           "no-invalid-css": "off" // warning does not work
-        }
+        },
+        "globalTags": ["google-cast-launcher"],
+        "customHtmlData": [
+          "./node_modules/@lrnwebcomponents/simple-tooltip/custom-elements.json"
+        ]
       }
     ]
   }