Update to LitElement v3.0.0-pre.1

README.md

@@ -96,7 +96,8 @@ Note: If you need to add static files to the build, like the `images` folder or
 1. Create the new page component (extending from `PageElement` helper) in the `pages` folder. For example a `page-explore.ts`.
 
    ```typescript
-   import { html, customElement } from 'lit-element';
+   import { html } from 'lit-element';
+   import { customElement } from 'lit-element/lib/decorators';
 
    import { PageElement } from '../helpers/page-element';
 

package.json

@@ -26,7 +26,7 @@
   },
   "dependencies": {
     "@vaadin/router": "^1.7.2",
-    "lit-element": "^2.4.0",
+    "lit-element": "^3.0.0-pre.1",
     "pwa-helper-components": "^0.2.10",
     "tslib": "^2.0.3"
   },

src/components/app-index.ts

@@ -5,7 +5,8 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import { LitElement, html, css, customElement, query } from 'lit-element';
+import { LitElement, html, css } from 'lit-element';
+import { customElement, query } from 'lit-element/lib/decorators';
 
 import { config } from '../config';
 import { attachRouter, urlForName } from '../router';

src/helpers/page-element.ts

@@ -5,7 +5,8 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import { LitElement, internalProperty } from 'lit-element';
+import { LitElement } from 'lit-element';
+import { internalProperty } from 'lit-element/lib/decorators';
 import type { PropertyValues } from 'lit-element';
 import type { Route, RouterLocation } from '@vaadin/router';
 

src/pages/page-about.ts

@@ -5,7 +5,8 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import { html, css, customElement } from 'lit-element';
+import { html, css } from 'lit-element';
+import { customElement } from 'lit-element/lib/decorators';
 
 import { PageElement } from '../helpers/page-element';
 

src/pages/page-home.ts

@@ -5,7 +5,8 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import { html, css, customElement } from 'lit-element';
+import { html, css } from 'lit-element';
+import { customElement } from 'lit-element/lib/decorators';
 
 import { PageElement } from '../helpers/page-element';
 

src/pages/page-not-found.ts

@@ -5,7 +5,8 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import { html, css, customElement } from 'lit-element';
+import { html, css } from 'lit-element';
+import { customElement } from 'lit-element/lib/decorators';
 
 import { urlForName } from '../router';