tsconfig.json

{
    "compilerOptions": {
        "module": "ESNext",
        "moduleResolution": "Node",
        "target": "ES2020",
        "jsx": "react",
        "strictNullChecks": true,
        "strictFunctionTypes": true,
        "experimentalDecorators": true,
        "useDefineForClassFields": false,
        "plugins": [
            {
                "name": "ts-lit-plugin",
                "strict": false,
                // These tags are provided by the HA frontend and [almost all] cannot be
                // imported by a custom card directly.
                "globalTags": [
                    "ha-card",
                    "ha-combo-box",
                    "ha-icon",
                    "ha-icon-button",
                    "ha-button-menu",
                    "ha-circular-progress",
                    "ha-selector",
                    "ha-svg-icon",
                    "mwc-button",
                    "mwc-list-item",
                    "paper-toast"
                ],
                "rules": {
                    "no-unknown-tag-name": "error",
                    "no-missing-import": "error",
                    "no-unclosed-tag": "error",
                    "no-incompatible-type-binding": "warning",
                    "no-invalid-css": "warning",
                    "no-missing-element-type-definition": "warning",
                    "no-property-visibility-mismatch": "error"
                }
            }
        ]
    },
    "exclude": [
        "node_modules",
        "**/node_modules/*"
    ]
}