Convert all *_html.js files to typescript

* Rename all files with the following commands:
  find . -name *_html.js -exec sh -c \
   'dirn=`dirname {}`;bn=`basename {} .js`; git mv {} $dirn/$bn.ts' \;

* Replace in all *_html.ts files
    import {html} from '@polymer/polymer/lib/utils/html-tag.js';
  with
    import {html} from '@polymer/polymer/lib/utils/html-tag';

* Update manually import path in
  gr-hovercard-account_html.ts

* Convert manually gr-hovercard-shared-style.js to .ts

Change-Id: I83102311c70740586514b6f32d03328e2a59c3ec

polygerrit-ui/app/elements/admin/gr-access-section/gr-access-section_html.ts

diff --git a/polygerrit-ui/app/elements/admin/gr-access-section/gr-access-section_html.js b/polygerrit-ui/app/elements/admin/gr-access-section/gr-access-section_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/admin/gr-access-section/gr-access-section_html.js
rename to polygerrit-ui/app/elements/admin/gr-access-section/gr-access-section_html.ts
index 7bbd599..7c9f28b 100644
--- a/polygerrit-ui/app/elements/admin/gr-access-section/gr-access-section_html.js
+++ b/polygerrit-ui/app/elements/admin/gr-access-section/gr-access-section_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list_html.ts

diff --git a/polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list_html.js b/polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list_html.js
rename to polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list_html.ts
index 4548a45..e22dc66 100644
--- a/polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list_html.js
+++ b/polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view_html.ts

diff --git a/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view_html.js b/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view_html.js
rename to polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view_html.ts
index b62a41b..5e85a93 100644
--- a/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view_html.js
+++ b/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/admin/gr-confirm-delete-item-dialog/gr-confirm-delete-item-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/admin/gr-confirm-delete-item-dialog/gr-confirm-delete-item-dialog_html.js b/polygerrit-ui/app/elements/admin/gr-confirm-delete-item-dialog/gr-confirm-delete-item-dialog_html.ts
similarity index 94%
rename from polygerrit-ui/app/elements/admin/gr-confirm-delete-item-dialog/gr-confirm-delete-item-dialog_html.js
rename to polygerrit-ui/app/elements/admin/gr-confirm-delete-item-dialog/gr-confirm-delete-item-dialog_html.ts
index 3810d32..ce9ac9c 100644
--- a/polygerrit-ui/app/elements/admin/gr-confirm-delete-item-dialog/gr-confirm-delete-item-dialog_html.js
+++ b/polygerrit-ui/app/elements/admin/gr-confirm-delete-item-dialog/gr-confirm-delete-item-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/admin/gr-create-change-dialog/gr-create-change-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/admin/gr-create-change-dialog/gr-create-change-dialog_html.js b/polygerrit-ui/app/elements/admin/gr-create-change-dialog/gr-create-change-dialog_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/admin/gr-create-change-dialog/gr-create-change-dialog_html.js
rename to polygerrit-ui/app/elements/admin/gr-create-change-dialog/gr-create-change-dialog_html.ts
index f18da81..77e2c3b 100644
--- a/polygerrit-ui/app/elements/admin/gr-create-change-dialog/gr-create-change-dialog_html.js
+++ b/polygerrit-ui/app/elements/admin/gr-create-change-dialog/gr-create-change-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog_html.js b/polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog_html.ts
similarity index 94%
rename from polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog_html.js
rename to polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog_html.ts
index bc1f24c..d4ecc5d 100644
--- a/polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog_html.js
+++ b/polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/admin/gr-create-pointer-dialog/gr-create-pointer-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/admin/gr-create-pointer-dialog/gr-create-pointer-dialog_html.js b/polygerrit-ui/app/elements/admin/gr-create-pointer-dialog/gr-create-pointer-dialog_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/admin/gr-create-pointer-dialog/gr-create-pointer-dialog_html.js
rename to polygerrit-ui/app/elements/admin/gr-create-pointer-dialog/gr-create-pointer-dialog_html.ts
index 62a2e0f..0b3d81ae 100644
--- a/polygerrit-ui/app/elements/admin/gr-create-pointer-dialog/gr-create-pointer-dialog_html.js
+++ b/polygerrit-ui/app/elements/admin/gr-create-pointer-dialog/gr-create-pointer-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/admin/gr-create-repo-dialog/gr-create-repo-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/admin/gr-create-repo-dialog/gr-create-repo-dialog_html.js b/polygerrit-ui/app/elements/admin/gr-create-repo-dialog/gr-create-repo-dialog_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/admin/gr-create-repo-dialog/gr-create-repo-dialog_html.js
rename to polygerrit-ui/app/elements/admin/gr-create-repo-dialog/gr-create-repo-dialog_html.ts
index 680986c..02aabfe 100644
--- a/polygerrit-ui/app/elements/admin/gr-create-repo-dialog/gr-create-repo-dialog_html.js
+++ b/polygerrit-ui/app/elements/admin/gr-create-repo-dialog/gr-create-repo-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/admin/gr-group-audit-log/gr-group-audit-log_html.ts

diff --git a/polygerrit-ui/app/elements/admin/gr-group-audit-log/gr-group-audit-log_html.js b/polygerrit-ui/app/elements/admin/gr-group-audit-log/gr-group-audit-log_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/admin/gr-group-audit-log/gr-group-audit-log_html.js
rename to polygerrit-ui/app/elements/admin/gr-group-audit-log/gr-group-audit-log_html.ts
index 130efbb..1212685 100644
--- a/polygerrit-ui/app/elements/admin/gr-group-audit-log/gr-group-audit-log_html.js
+++ b/polygerrit-ui/app/elements/admin/gr-group-audit-log/gr-group-audit-log_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/admin/gr-group-members/gr-group-members_html.ts

diff --git a/polygerrit-ui/app/elements/admin/gr-group-members/gr-group-members_html.js b/polygerrit-ui/app/elements/admin/gr-group-members/gr-group-members_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/admin/gr-group-members/gr-group-members_html.js
rename to polygerrit-ui/app/elements/admin/gr-group-members/gr-group-members_html.ts
index 47657ac..2d3f8fc 100644
--- a/polygerrit-ui/app/elements/admin/gr-group-members/gr-group-members_html.js
+++ b/polygerrit-ui/app/elements/admin/gr-group-members/gr-group-members_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="gr-form-styles">

polygerrit-ui/app/elements/admin/gr-group/gr-group_html.ts

diff --git a/polygerrit-ui/app/elements/admin/gr-group/gr-group_html.js b/polygerrit-ui/app/elements/admin/gr-group/gr-group_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/admin/gr-group/gr-group_html.js
rename to polygerrit-ui/app/elements/admin/gr-group/gr-group_html.ts
index 7a843dc..aed73bf 100644
--- a/polygerrit-ui/app/elements/admin/gr-group/gr-group_html.js
+++ b/polygerrit-ui/app/elements/admin/gr-group/gr-group_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/admin/gr-permission/gr-permission_html.ts

diff --git a/polygerrit-ui/app/elements/admin/gr-permission/gr-permission_html.js b/polygerrit-ui/app/elements/admin/gr-permission/gr-permission_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/admin/gr-permission/gr-permission_html.js
rename to polygerrit-ui/app/elements/admin/gr-permission/gr-permission_html.ts
index ed4f64a..9795c92 100644
--- a/polygerrit-ui/app/elements/admin/gr-permission/gr-permission_html.js
+++ b/polygerrit-ui/app/elements/admin/gr-permission/gr-permission_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/admin/gr-plugin-config-array-editor/gr-plugin-config-array-editor_html.ts

diff --git a/polygerrit-ui/app/elements/admin/gr-plugin-config-array-editor/gr-plugin-config-array-editor_html.js b/polygerrit-ui/app/elements/admin/gr-plugin-config-array-editor/gr-plugin-config-array-editor_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/admin/gr-plugin-config-array-editor/gr-plugin-config-array-editor_html.js
rename to polygerrit-ui/app/elements/admin/gr-plugin-config-array-editor/gr-plugin-config-array-editor_html.ts
index be35035..c96b86c 100644
--- a/polygerrit-ui/app/elements/admin/gr-plugin-config-array-editor/gr-plugin-config-array-editor_html.js
+++ b/polygerrit-ui/app/elements/admin/gr-plugin-config-array-editor/gr-plugin-config-array-editor_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list_html.ts

diff --git a/polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list_html.js b/polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list_html.js
rename to polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list_html.ts
index bd2bea3..d5318b5 100644
--- a/polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list_html.js
+++ b/polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/admin/gr-repo-access/gr-repo-access_html.ts

diff --git a/polygerrit-ui/app/elements/admin/gr-repo-access/gr-repo-access_html.js b/polygerrit-ui/app/elements/admin/gr-repo-access/gr-repo-access_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/admin/gr-repo-access/gr-repo-access_html.js
rename to polygerrit-ui/app/elements/admin/gr-repo-access/gr-repo-access_html.ts
index 8148884..4e76360 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-access/gr-repo-access_html.js
+++ b/polygerrit-ui/app/elements/admin/gr-repo-access/gr-repo-access_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/admin/gr-repo-commands/gr-repo-commands_html.ts

diff --git a/polygerrit-ui/app/elements/admin/gr-repo-commands/gr-repo-commands_html.js b/polygerrit-ui/app/elements/admin/gr-repo-commands/gr-repo-commands_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/admin/gr-repo-commands/gr-repo-commands_html.js
rename to polygerrit-ui/app/elements/admin/gr-repo-commands/gr-repo-commands_html.ts
index 3ae5b29..3880e4a 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-commands/gr-repo-commands_html.js
+++ b/polygerrit-ui/app/elements/admin/gr-repo-commands/gr-repo-commands_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/admin/gr-repo-dashboards/gr-repo-dashboards_html.ts

diff --git a/polygerrit-ui/app/elements/admin/gr-repo-dashboards/gr-repo-dashboards_html.js b/polygerrit-ui/app/elements/admin/gr-repo-dashboards/gr-repo-dashboards_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/admin/gr-repo-dashboards/gr-repo-dashboards_html.js
rename to polygerrit-ui/app/elements/admin/gr-repo-dashboards/gr-repo-dashboards_html.ts
index 8ce69df..7cdd10e 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-dashboards/gr-repo-dashboards_html.js
+++ b/polygerrit-ui/app/elements/admin/gr-repo-dashboards/gr-repo-dashboards_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list_html.ts

diff --git a/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list_html.js b/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list_html.js
rename to polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list_html.ts
index 21971e7..8955092 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list_html.js
+++ b/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="gr-form-styles">

polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list_html.ts

diff --git a/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list_html.js b/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list_html.js
rename to polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list_html.ts
index 3681399..f61adce 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list_html.js
+++ b/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/admin/gr-repo-plugin-config/gr-repo-plugin-config_html.ts

diff --git a/polygerrit-ui/app/elements/admin/gr-repo-plugin-config/gr-repo-plugin-config_html.js b/polygerrit-ui/app/elements/admin/gr-repo-plugin-config/gr-repo-plugin-config_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/admin/gr-repo-plugin-config/gr-repo-plugin-config_html.js
rename to polygerrit-ui/app/elements/admin/gr-repo-plugin-config/gr-repo-plugin-config_html.ts
index ee633463..3045108 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-plugin-config/gr-repo-plugin-config_html.js
+++ b/polygerrit-ui/app/elements/admin/gr-repo-plugin-config/gr-repo-plugin-config_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/admin/gr-repo/gr-repo_html.ts

diff --git a/polygerrit-ui/app/elements/admin/gr-repo/gr-repo_html.js b/polygerrit-ui/app/elements/admin/gr-repo/gr-repo_html.ts
similarity index 99%
rename from polygerrit-ui/app/elements/admin/gr-repo/gr-repo_html.js
rename to polygerrit-ui/app/elements/admin/gr-repo/gr-repo_html.ts
index ea8a8b9..26d05c3 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo/gr-repo_html.js
+++ b/polygerrit-ui/app/elements/admin/gr-repo/gr-repo_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/admin/gr-rule-editor/gr-rule-editor_html.ts

diff --git a/polygerrit-ui/app/elements/admin/gr-rule-editor/gr-rule-editor_html.js b/polygerrit-ui/app/elements/admin/gr-rule-editor/gr-rule-editor_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/admin/gr-rule-editor/gr-rule-editor_html.js
rename to polygerrit-ui/app/elements/admin/gr-rule-editor/gr-rule-editor_html.ts
index 3e4f9d4..98403e0 100644
--- a/polygerrit-ui/app/elements/admin/gr-rule-editor/gr-rule-editor_html.js
+++ b/polygerrit-ui/app/elements/admin/gr-rule-editor/gr-rule-editor_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item_html.ts

diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item_html.js b/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item_html.js
rename to polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item_html.ts
index 0fd3030..7fa59d4 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item_html.js
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view_html.ts

diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view_html.js b/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view_html.js
rename to polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view_html.ts
index b322f38..0e8f843 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view_html.js
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list_html.ts

diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list_html.js b/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list_html.js
rename to polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list_html.ts
index 623838b..404456c 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list_html.js
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change-list/gr-create-change-help/gr-create-change-help_html.ts

diff --git a/polygerrit-ui/app/elements/change-list/gr-create-change-help/gr-create-change-help_html.js b/polygerrit-ui/app/elements/change-list/gr-create-change-help/gr-create-change-help_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/change-list/gr-create-change-help/gr-create-change-help_html.js
rename to polygerrit-ui/app/elements/change-list/gr-create-change-help/gr-create-change-help_html.ts
index cc6223d..c2f97a6 100644
--- a/polygerrit-ui/app/elements/change-list/gr-create-change-help/gr-create-change-help_html.js
+++ b/polygerrit-ui/app/elements/change-list/gr-create-change-help/gr-create-change-help_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change-list/gr-create-commands-dialog/gr-create-commands-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/change-list/gr-create-commands-dialog/gr-create-commands-dialog_html.js b/polygerrit-ui/app/elements/change-list/gr-create-commands-dialog/gr-create-commands-dialog_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/change-list/gr-create-commands-dialog/gr-create-commands-dialog_html.js
rename to polygerrit-ui/app/elements/change-list/gr-create-commands-dialog/gr-create-commands-dialog_html.ts
index d2a1af9..9031738 100644
--- a/polygerrit-ui/app/elements/change-list/gr-create-commands-dialog/gr-create-commands-dialog_html.js
+++ b/polygerrit-ui/app/elements/change-list/gr-create-commands-dialog/gr-create-commands-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change-list/gr-create-destination-dialog/gr-create-destination-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/change-list/gr-create-destination-dialog/gr-create-destination-dialog_html.js b/polygerrit-ui/app/elements/change-list/gr-create-destination-dialog/gr-create-destination-dialog_html.ts
similarity index 95%
rename from polygerrit-ui/app/elements/change-list/gr-create-destination-dialog/gr-create-destination-dialog_html.js
rename to polygerrit-ui/app/elements/change-list/gr-create-destination-dialog/gr-create-destination-dialog_html.ts
index c7cd647..9155d9a 100644
--- a/polygerrit-ui/app/elements/change-list/gr-create-destination-dialog/gr-create-destination-dialog_html.js
+++ b/polygerrit-ui/app/elements/change-list/gr-create-destination-dialog/gr-create-destination-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles"></style>

polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view_html.ts

diff --git a/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view_html.js b/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view_html.js
rename to polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view_html.ts
index cf1036f..ea04c5a 100644
--- a/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view_html.js
+++ b/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change-list/gr-repo-header/gr-repo-header_html.ts

diff --git a/polygerrit-ui/app/elements/change-list/gr-repo-header/gr-repo-header_html.js b/polygerrit-ui/app/elements/change-list/gr-repo-header/gr-repo-header_html.ts
similarity index 94%
rename from polygerrit-ui/app/elements/change-list/gr-repo-header/gr-repo-header_html.js
rename to polygerrit-ui/app/elements/change-list/gr-repo-header/gr-repo-header_html.ts
index 75af51e..9fd27c6 100644
--- a/polygerrit-ui/app/elements/change-list/gr-repo-header/gr-repo-header_html.js
+++ b/polygerrit-ui/app/elements/change-list/gr-repo-header/gr-repo-header_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header_html.ts

diff --git a/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header_html.js b/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header_html.js
rename to polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header_html.ts
index 8207284..72bdca6 100644
--- a/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header_html.js
+++ b/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_html.js b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_html.js
rename to polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_html.ts
index 200ffc9..4e315af 100644
--- a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_html.js
+++ b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_html.js b/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_html.js
rename to polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_html.ts
index 7d84835..e96912d 100644
--- a/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_html.js
+++ b/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="gr-change-metadata-shared-styles">

polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements_html.js b/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements_html.js
rename to polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements_html.ts
index 2314f6b..fc2346a 100644
--- a/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements_html.js
+++ b/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_html.js b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_html.ts
similarity index 99%
rename from polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_html.js
rename to polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_html.ts
index eaa13a4..04a810f 100644
--- a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_html.js
+++ b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change/gr-commit-info/gr-commit-info_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-commit-info/gr-commit-info_html.js b/polygerrit-ui/app/elements/change/gr-commit-info/gr-commit-info_html.ts
similarity index 95%
rename from polygerrit-ui/app/elements/change/gr-commit-info/gr-commit-info_html.js
rename to polygerrit-ui/app/elements/change/gr-commit-info/gr-commit-info_html.ts
index 608d12b..e350593 100644
--- a/polygerrit-ui/app/elements/change/gr-commit-info/gr-commit-info_html.js
+++ b/polygerrit-ui/app/elements/change/gr-commit-info/gr-commit-info_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change/gr-confirm-abandon-dialog/gr-confirm-abandon-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-confirm-abandon-dialog/gr-confirm-abandon-dialog_html.js b/polygerrit-ui/app/elements/change/gr-confirm-abandon-dialog/gr-confirm-abandon-dialog_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/change/gr-confirm-abandon-dialog/gr-confirm-abandon-dialog_html.js
rename to polygerrit-ui/app/elements/change/gr-confirm-abandon-dialog/gr-confirm-abandon-dialog_html.ts
index 050df25..7c1b725 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-abandon-dialog/gr-confirm-abandon-dialog_html.js
+++ b/polygerrit-ui/app/elements/change/gr-confirm-abandon-dialog/gr-confirm-abandon-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change/gr-confirm-cherrypick-conflict-dialog/gr-confirm-cherrypick-conflict-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-conflict-dialog/gr-confirm-cherrypick-conflict-dialog_html.js b/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-conflict-dialog/gr-confirm-cherrypick-conflict-dialog_html.ts
similarity index 95%
rename from polygerrit-ui/app/elements/change/gr-confirm-cherrypick-conflict-dialog/gr-confirm-cherrypick-conflict-dialog_html.js
rename to polygerrit-ui/app/elements/change/gr-confirm-cherrypick-conflict-dialog/gr-confirm-cherrypick-conflict-dialog_html.ts
index c7fb70c..5cf56b54 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-conflict-dialog/gr-confirm-cherrypick-conflict-dialog_html.js
+++ b/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-conflict-dialog/gr-confirm-cherrypick-conflict-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog_html.js b/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog_html.js
rename to polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog_html.ts
index eaf9cc8..072f110 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog_html.js
+++ b/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog_html.js b/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog_html.js
rename to polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog_html.ts
index f5ddf41..b5b46d6 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog_html.js
+++ b/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog_html.js b/polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog_html.js
rename to polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog_html.ts
index e9a8424..687d31f 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog_html.js
+++ b/polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change/gr-confirm-revert-dialog/gr-confirm-revert-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-confirm-revert-dialog/gr-confirm-revert-dialog_html.js b/polygerrit-ui/app/elements/change/gr-confirm-revert-dialog/gr-confirm-revert-dialog_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/change/gr-confirm-revert-dialog/gr-confirm-revert-dialog_html.js
rename to polygerrit-ui/app/elements/change/gr-confirm-revert-dialog/gr-confirm-revert-dialog_html.ts
index 7875fa7..f5561fc 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-revert-dialog/gr-confirm-revert-dialog_html.js
+++ b/polygerrit-ui/app/elements/change/gr-confirm-revert-dialog/gr-confirm-revert-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change/gr-confirm-revert-submission-dialog/gr-confirm-revert-submission-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-confirm-revert-submission-dialog/gr-confirm-revert-submission-dialog_html.js b/polygerrit-ui/app/elements/change/gr-confirm-revert-submission-dialog/gr-confirm-revert-submission-dialog_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/change/gr-confirm-revert-submission-dialog/gr-confirm-revert-submission-dialog_html.js
rename to polygerrit-ui/app/elements/change/gr-confirm-revert-submission-dialog/gr-confirm-revert-submission-dialog_html.ts
index 48051a0..cae4e1f 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-revert-submission-dialog/gr-confirm-revert-submission-dialog_html.js
+++ b/polygerrit-ui/app/elements/change/gr-confirm-revert-submission-dialog/gr-confirm-revert-submission-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <!-- TODO(taoalpha): move all shared styles to a style module. -->

polygerrit-ui/app/elements/change/gr-confirm-submit-dialog/gr-confirm-submit-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-confirm-submit-dialog/gr-confirm-submit-dialog_html.js b/polygerrit-ui/app/elements/change/gr-confirm-submit-dialog/gr-confirm-submit-dialog_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/change/gr-confirm-submit-dialog/gr-confirm-submit-dialog_html.js
rename to polygerrit-ui/app/elements/change/gr-confirm-submit-dialog/gr-confirm-submit-dialog_html.ts
index cf1a332..84668ed 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-submit-dialog/gr-confirm-submit-dialog_html.js
+++ b/polygerrit-ui/app/elements/change/gr-confirm-submit-dialog/gr-confirm-submit-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change/gr-download-dialog/gr-download-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-download-dialog/gr-download-dialog_html.js b/polygerrit-ui/app/elements/change/gr-download-dialog/gr-download-dialog_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/change/gr-download-dialog/gr-download-dialog_html.js
rename to polygerrit-ui/app/elements/change/gr-download-dialog/gr-download-dialog_html.ts
index 0446e4e..90185a6 100644
--- a/polygerrit-ui/app/elements/change/gr-download-dialog/gr-download-dialog_html.js
+++ b/polygerrit-ui/app/elements/change/gr-download-dialog/gr-download-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_html.js b/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_html.js
rename to polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_html.ts
index bb04114..beabeef 100644
--- a/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_html.js
+++ b/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change/gr-file-list/gr-file-list_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list_html.js b/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list_html.ts
similarity index 99%
rename from polygerrit-ui/app/elements/change/gr-file-list/gr-file-list_html.js
rename to polygerrit-ui/app/elements/change/gr-file-list/gr-file-list_html.ts
index 46497a1..e141b70 100644
--- a/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list_html.js
+++ b/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change/gr-included-in-dialog/gr-included-in-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-included-in-dialog/gr-included-in-dialog_html.js b/polygerrit-ui/app/elements/change/gr-included-in-dialog/gr-included-in-dialog_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/change/gr-included-in-dialog/gr-included-in-dialog_html.js
rename to polygerrit-ui/app/elements/change/gr-included-in-dialog/gr-included-in-dialog_html.ts
index 4670e6a..8e90f3b 100644
--- a/polygerrit-ui/app/elements/change/gr-included-in-dialog/gr-included-in-dialog_html.js
+++ b/polygerrit-ui/app/elements/change/gr-included-in-dialog/gr-included-in-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change/gr-label-score-row/gr-label-score-row_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-label-score-row/gr-label-score-row_html.js b/polygerrit-ui/app/elements/change/gr-label-score-row/gr-label-score-row_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/change/gr-label-score-row/gr-label-score-row_html.js
rename to polygerrit-ui/app/elements/change/gr-label-score-row/gr-label-score-row_html.ts
index fb0f9e8..312532e 100644
--- a/polygerrit-ui/app/elements/change/gr-label-score-row/gr-label-score-row_html.js
+++ b/polygerrit-ui/app/elements/change/gr-label-score-row/gr-label-score-row_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="gr-voting-styles">

polygerrit-ui/app/elements/change/gr-label-scores/gr-label-scores_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-label-scores/gr-label-scores_html.js b/polygerrit-ui/app/elements/change/gr-label-scores/gr-label-scores_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/change/gr-label-scores/gr-label-scores_html.js
rename to polygerrit-ui/app/elements/change/gr-label-scores/gr-label-scores_html.ts
index 1e3e7ec..974e55d 100644
--- a/polygerrit-ui/app/elements/change/gr-label-scores/gr-label-scores_html.js
+++ b/polygerrit-ui/app/elements/change/gr-label-scores/gr-label-scores_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change/gr-message/gr-message_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-message/gr-message_html.js b/polygerrit-ui/app/elements/change/gr-message/gr-message_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/change/gr-message/gr-message_html.js
rename to polygerrit-ui/app/elements/change/gr-message/gr-message_html.ts
index af57782..22d495b 100644
--- a/polygerrit-ui/app/elements/change/gr-message/gr-message_html.js
+++ b/polygerrit-ui/app/elements/change/gr-message/gr-message_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="gr-voting-styles">

polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list_html.js b/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list_html.js
rename to polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list_html.ts
index c696c8c..9c4ef04 100644
--- a/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list_html.js
+++ b/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list_html.js b/polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list_html.js
rename to polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list_html.ts
index 2721b2e2..6fe8cea 100644
--- a/polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list_html.js
+++ b/polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.js b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.ts
similarity index 99%
rename from polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.js
rename to polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.ts
index bebeb7f..3fab073 100644
--- a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.js
+++ b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list_html.js b/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list_html.js
rename to polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list_html.ts
index 13a41ed..616a7db 100644
--- a/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list_html.js
+++ b/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_html.js b/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_html.js
rename to polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_html.ts
index 80983ca..d74c985 100644
--- a/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_html.js
+++ b/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/change/gr-upload-help-dialog/gr-upload-help-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/change/gr-upload-help-dialog/gr-upload-help-dialog_html.js b/polygerrit-ui/app/elements/change/gr-upload-help-dialog/gr-upload-help-dialog_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/change/gr-upload-help-dialog/gr-upload-help-dialog_html.js
rename to polygerrit-ui/app/elements/change/gr-upload-help-dialog/gr-upload-help-dialog_html.ts
index ec010a1..1ee3a3a 100644
--- a/polygerrit-ui/app/elements/change/gr-upload-help-dialog/gr-upload-help-dialog_html.js
+++ b/polygerrit-ui/app/elements/change/gr-upload-help-dialog/gr-upload-help-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown_html.ts

diff --git a/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown_html.js b/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown_html.ts
similarity index 95%
rename from polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown_html.js
rename to polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown_html.ts
index 5db7923..b67e1e8 100644
--- a/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown_html.js
+++ b/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/core/gr-error-dialog/gr-error-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/core/gr-error-dialog/gr-error-dialog_html.js b/polygerrit-ui/app/elements/core/gr-error-dialog/gr-error-dialog_html.ts
similarity index 95%
rename from polygerrit-ui/app/elements/core/gr-error-dialog/gr-error-dialog_html.js
rename to polygerrit-ui/app/elements/core/gr-error-dialog/gr-error-dialog_html.ts
index 39d4f2d..10476cd 100644
--- a/polygerrit-ui/app/elements/core/gr-error-dialog/gr-error-dialog_html.js
+++ b/polygerrit-ui/app/elements/core/gr-error-dialog/gr-error-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager_html.ts

diff --git a/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager_html.js b/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager_html.ts
similarity index 94%
rename from polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager_html.js
rename to polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager_html.ts
index 2fa9b95..1cefb78 100644
--- a/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager_html.js
+++ b/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <gr-overlay with-backdrop="" id="errorOverlay">

polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display_html.ts

diff --git a/polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display_html.js b/polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display_html.ts
similarity index 95%
rename from polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display_html.js
rename to polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display_html.ts
index 334a40a..0a75104 100644
--- a/polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display_html.js
+++ b/polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/core/gr-keyboard-shortcuts-dialog/gr-keyboard-shortcuts-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/core/gr-keyboard-shortcuts-dialog/gr-keyboard-shortcuts-dialog_html.js b/polygerrit-ui/app/elements/core/gr-keyboard-shortcuts-dialog/gr-keyboard-shortcuts-dialog_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/core/gr-keyboard-shortcuts-dialog/gr-keyboard-shortcuts-dialog_html.js
rename to polygerrit-ui/app/elements/core/gr-keyboard-shortcuts-dialog/gr-keyboard-shortcuts-dialog_html.ts
index e850fbe..1860f38 100644
--- a/polygerrit-ui/app/elements/core/gr-keyboard-shortcuts-dialog/gr-keyboard-shortcuts-dialog_html.js
+++ b/polygerrit-ui/app/elements/core/gr-keyboard-shortcuts-dialog/gr-keyboard-shortcuts-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/core/gr-main-header/gr-main-header_html.ts

diff --git a/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header_html.js b/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/core/gr-main-header/gr-main-header_html.js
rename to polygerrit-ui/app/elements/core/gr-main-header/gr-main-header_html.ts
index e50b408..8ef54d6 100644
--- a/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header_html.js
+++ b/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/core/gr-router/gr-router_html.ts

diff --git a/polygerrit-ui/app/elements/core/gr-router/gr-router_html.js b/polygerrit-ui/app/elements/core/gr-router/gr-router_html.ts
similarity index 91%
rename from polygerrit-ui/app/elements/core/gr-router/gr-router_html.js
rename to polygerrit-ui/app/elements/core/gr-router/gr-router_html.ts
index 8aa0835..91d8b41 100644
--- a/polygerrit-ui/app/elements/core/gr-router/gr-router_html.js
+++ b/polygerrit-ui/app/elements/core/gr-router/gr-router_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <gr-rest-api-interface id="restAPI"></gr-rest-api-interface>

polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar_html.ts

diff --git a/polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar_html.js b/polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar_html.ts
similarity index 95%
rename from polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar_html.js
rename to polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar_html.ts
index b0ef7af..a4d5e69 100644
--- a/polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar_html.js
+++ b/polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/core/gr-smart-search/gr-smart-search_html.ts

diff --git a/polygerrit-ui/app/elements/core/gr-smart-search/gr-smart-search_html.js b/polygerrit-ui/app/elements/core/gr-smart-search/gr-smart-search_html.ts
similarity index 94%
rename from polygerrit-ui/app/elements/core/gr-smart-search/gr-smart-search_html.js
rename to polygerrit-ui/app/elements/core/gr-smart-search/gr-smart-search_html.ts
index d490308..7088937 100644
--- a/polygerrit-ui/app/elements/core/gr-smart-search/gr-smart-search_html.js
+++ b/polygerrit-ui/app/elements/core/gr-smart-search/gr-smart-search_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles"></style>

polygerrit-ui/app/elements/diff/gr-apply-fix-dialog/gr-apply-fix-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/diff/gr-apply-fix-dialog/gr-apply-fix-dialog_html.js b/polygerrit-ui/app/elements/diff/gr-apply-fix-dialog/gr-apply-fix-dialog_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/diff/gr-apply-fix-dialog/gr-apply-fix-dialog_html.js
rename to polygerrit-ui/app/elements/diff/gr-apply-fix-dialog/gr-apply-fix-dialog_html.ts
index a5a6ff2..057fd01 100644
--- a/polygerrit-ui/app/elements/diff/gr-apply-fix-dialog/gr-apply-fix-dialog_html.js
+++ b/polygerrit-ui/app/elements/diff/gr-apply-fix-dialog/gr-apply-fix-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api_html.js

diff --git a/polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api_html.js b/polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api_html.js
deleted file mode 100644
index 8aa0835..0000000
--- a/polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api_html.js
+++ /dev/null
@@ -1,21 +0,0 @@
-/**
- * @license
- * Copyright (C) 2020 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
-
-export const htmlTemplate = html`
-  <gr-rest-api-interface id="restAPI"></gr-rest-api-interface>
-`;

polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api_html.ts

diff --git a/polygerrit-ui/app/elements/core/gr-router/gr-router_html.js b/polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api_html.ts
similarity index 91%
copy from polygerrit-ui/app/elements/core/gr-router/gr-router_html.js
copy to polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api_html.ts
index 8aa0835..91d8b41 100644
--- a/polygerrit-ui/app/elements/core/gr-router/gr-router_html.js
+++ b/polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <gr-rest-api-interface id="restAPI"></gr-rest-api-interface>

polygerrit-ui/app/elements/diff/gr-coverage-layer/gr-coverage-layer_html.ts

diff --git a/polygerrit-ui/app/elements/diff/gr-coverage-layer/gr-coverage-layer_html.js b/polygerrit-ui/app/elements/diff/gr-coverage-layer/gr-coverage-layer_html.ts
similarity index 91%
rename from polygerrit-ui/app/elements/diff/gr-coverage-layer/gr-coverage-layer_html.js
rename to polygerrit-ui/app/elements/diff/gr-coverage-layer/gr-coverage-layer_html.ts
index 3ed33d1..1489006 100644
--- a/polygerrit-ui/app/elements/diff/gr-coverage-layer/gr-coverage-layer_html.js
+++ b/polygerrit-ui/app/elements/diff/gr-coverage-layer/gr-coverage-layer_html.ts
@@ -14,6 +14,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html``;

polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder-element_html.ts

diff --git a/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder-element_html.js b/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder-element_html.ts
similarity index 94%
rename from polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder-element_html.js
rename to polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder-element_html.ts
index 4d6b890..573f559 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder-element_html.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder-element_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <div class="contentWrapper">

polygerrit-ui/app/elements/diff/gr-diff-cursor/gr-diff-cursor_html.ts

diff --git a/polygerrit-ui/app/elements/diff/gr-diff-cursor/gr-diff-cursor_html.js b/polygerrit-ui/app/elements/diff/gr-diff-cursor/gr-diff-cursor_html.ts
similarity index 93%
rename from polygerrit-ui/app/elements/diff/gr-diff-cursor/gr-diff-cursor_html.js
rename to polygerrit-ui/app/elements/diff/gr-diff-cursor/gr-diff-cursor_html.ts
index e400792..712a93d 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-cursor/gr-diff-cursor_html.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-cursor/gr-diff-cursor_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <gr-cursor-manager

polygerrit-ui/app/elements/diff/gr-diff-highlight/gr-diff-highlight_html.ts

diff --git a/polygerrit-ui/app/elements/diff/gr-diff-highlight/gr-diff-highlight_html.js b/polygerrit-ui/app/elements/diff/gr-diff-highlight/gr-diff-highlight_html.ts
similarity index 93%
rename from polygerrit-ui/app/elements/diff/gr-diff-highlight/gr-diff-highlight_html.js
rename to polygerrit-ui/app/elements/diff/gr-diff-highlight/gr-diff-highlight_html.ts
index afd4ac5..5a6cb1c 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-highlight/gr-diff-highlight_html.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-highlight/gr-diff-highlight_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host_html.ts

diff --git a/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host_html.js b/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host_html.js
rename to polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host_html.ts
index aa05bb5..38b0d6d 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host_html.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <gr-diff

polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector_html.ts

diff --git a/polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector_html.js b/polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector_html.ts
similarity index 95%
rename from polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector_html.js
rename to polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector_html.ts
index b5393ea..40f6a32 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector_html.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/diff/gr-diff-preferences-dialog/gr-diff-preferences-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/diff/gr-diff-preferences-dialog/gr-diff-preferences-dialog_html.js b/polygerrit-ui/app/elements/diff/gr-diff-preferences-dialog/gr-diff-preferences-dialog_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/diff/gr-diff-preferences-dialog/gr-diff-preferences-dialog_html.js
rename to polygerrit-ui/app/elements/diff/gr-diff-preferences-dialog/gr-diff-preferences-dialog_html.ts
index d65ba1f..9c942a3 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-preferences-dialog/gr-diff-preferences-dialog_html.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-preferences-dialog/gr-diff-preferences-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/diff/gr-diff-selection/gr-diff-selection_html.ts

diff --git a/polygerrit-ui/app/elements/diff/gr-diff-selection/gr-diff-selection_html.js b/polygerrit-ui/app/elements/diff/gr-diff-selection/gr-diff-selection_html.ts
similarity index 91%
rename from polygerrit-ui/app/elements/diff/gr-diff-selection/gr-diff-selection_html.js
rename to polygerrit-ui/app/elements/diff/gr-diff-selection/gr-diff-selection_html.ts
index 620ef02..bd0e034 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-selection/gr-diff-selection_html.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-selection/gr-diff-selection_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <div class="contentWrapper">

polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_html.ts

diff --git a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_html.js b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_html.ts
similarity index 99%
rename from polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_html.js
rename to polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_html.ts
index a6e6591..e2cb880 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_html.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/diff/gr-diff/gr-diff_html.ts

diff --git a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff_html.js b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff_html.ts
similarity index 99%
rename from polygerrit-ui/app/elements/diff/gr-diff/gr-diff_html.js
rename to polygerrit-ui/app/elements/diff/gr-diff/gr-diff_html.ts
index 94a3701..f18af23 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff_html.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select_html.ts

diff --git a/polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select_html.js b/polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select_html.js
rename to polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select_html.ts
index cc11cfa..415ef4b 100644
--- a/polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select_html.js
+++ b/polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/diff/gr-ranged-comment-layer/gr-ranged-comment-layer_html.ts

diff --git a/polygerrit-ui/app/elements/diff/gr-ranged-comment-layer/gr-ranged-comment-layer_html.js b/polygerrit-ui/app/elements/diff/gr-ranged-comment-layer/gr-ranged-comment-layer_html.ts
similarity index 91%
rename from polygerrit-ui/app/elements/diff/gr-ranged-comment-layer/gr-ranged-comment-layer_html.js
rename to polygerrit-ui/app/elements/diff/gr-ranged-comment-layer/gr-ranged-comment-layer_html.ts
index 3ed33d1..1489006 100644
--- a/polygerrit-ui/app/elements/diff/gr-ranged-comment-layer/gr-ranged-comment-layer_html.js
+++ b/polygerrit-ui/app/elements/diff/gr-ranged-comment-layer/gr-ranged-comment-layer_html.ts
@@ -14,6 +14,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html``;

polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box_html.ts

diff --git a/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box_html.js b/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box_html.ts
similarity index 93%
rename from polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box_html.js
rename to polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box_html.ts
index e7795b9..24d63b3 100644
--- a/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box_html.js
+++ b/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer_html.ts

diff --git a/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer_html.js b/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer_html.ts
similarity index 91%
rename from polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer_html.js
rename to polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer_html.ts
index 433f814..ac59f4f 100644
--- a/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer_html.js
+++ b/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <gr-lib-loader id="libLoader"></gr-lib-loader>

polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search_html.ts

diff --git a/polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search_html.js b/polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search_html.js
rename to polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search_html.ts
index b637b75..de0a990 100644
--- a/polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search_html.js
+++ b/polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor_html.ts

diff --git a/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor_html.js b/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor_html.ts
similarity index 94%
rename from polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor_html.js
rename to polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor_html.ts
index 7368289..ba8af3c 100644
--- a/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor_html.js
+++ b/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls_html.ts

diff --git a/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls_html.js b/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls_html.js
rename to polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls_html.ts
index 02639c0..b67f6cd 100644
--- a/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls_html.js
+++ b/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls_html.ts

diff --git a/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls_html.js b/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls_html.ts
similarity index 95%
rename from polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls_html.js
rename to polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls_html.ts
index ec0b8b4..c6a6de7 100644
--- a/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls_html.js
+++ b/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view_html.ts

diff --git a/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view_html.js b/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view_html.js
rename to polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view_html.ts
index 9dc35b2..bd8304f 100644
--- a/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view_html.js
+++ b/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/gr-app-element_html.ts

diff --git a/polygerrit-ui/app/elements/gr-app-element_html.js b/polygerrit-ui/app/elements/gr-app-element_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/gr-app-element_html.js
rename to polygerrit-ui/app/elements/gr-app-element_html.ts
index 75295bc..66624e3 100644
--- a/polygerrit-ui/app/elements/gr-app-element_html.js
+++ b/polygerrit-ui/app/elements/gr-app-element_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/gr-app_html.ts

diff --git a/polygerrit-ui/app/elements/gr-app_html.js b/polygerrit-ui/app/elements/gr-app_html.ts
similarity index 91%
rename from polygerrit-ui/app/elements/gr-app_html.js
rename to polygerrit-ui/app/elements/gr-app_html.ts
index 3da1b69..f6172c9 100644
--- a/polygerrit-ui/app/elements/gr-app_html.js
+++ b/polygerrit-ui/app/elements/gr-app_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <gr-app-element id="app-element"></gr-app-element>

polygerrit-ui/app/elements/plugins/gr-endpoint-decorator/gr-endpoint-decorator_html.ts

diff --git a/polygerrit-ui/app/elements/plugins/gr-endpoint-decorator/gr-endpoint-decorator_html.js b/polygerrit-ui/app/elements/plugins/gr-endpoint-decorator/gr-endpoint-decorator_html.ts
similarity index 91%
rename from polygerrit-ui/app/elements/plugins/gr-endpoint-decorator/gr-endpoint-decorator_html.js
rename to polygerrit-ui/app/elements/plugins/gr-endpoint-decorator/gr-endpoint-decorator_html.ts
index c4310fc..94196df 100644
--- a/polygerrit-ui/app/elements/plugins/gr-endpoint-decorator/gr-endpoint-decorator_html.js
+++ b/polygerrit-ui/app/elements/plugins/gr-endpoint-decorator/gr-endpoint-decorator_html.ts
@@ -14,6 +14,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html` <slot></slot> `;

polygerrit-ui/app/elements/plugins/gr-external-style/gr-external-style_html.js

diff --git a/polygerrit-ui/app/elements/plugins/gr-external-style/gr-external-style_html.js b/polygerrit-ui/app/elements/plugins/gr-external-style/gr-external-style_html.js
deleted file mode 100644
index c4310fc..0000000
--- a/polygerrit-ui/app/elements/plugins/gr-external-style/gr-external-style_html.js
+++ /dev/null
@@ -1,19 +0,0 @@
-/**
- * @license
- * Copyright (C) 2020 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
-
-export const htmlTemplate = html` <slot></slot> `;

polygerrit-ui/app/elements/plugins/gr-external-style/gr-external-style_html.ts

diff --git a/polygerrit-ui/app/elements/plugins/gr-endpoint-decorator/gr-endpoint-decorator_html.js b/polygerrit-ui/app/elements/plugins/gr-external-style/gr-external-style_html.ts
similarity index 91%
copy from polygerrit-ui/app/elements/plugins/gr-endpoint-decorator/gr-endpoint-decorator_html.js
copy to polygerrit-ui/app/elements/plugins/gr-external-style/gr-external-style_html.ts
index c4310fc..94196df 100644
--- a/polygerrit-ui/app/elements/plugins/gr-endpoint-decorator/gr-endpoint-decorator_html.js
+++ b/polygerrit-ui/app/elements/plugins/gr-external-style/gr-external-style_html.ts
@@ -14,6 +14,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html` <slot></slot> `;

polygerrit-ui/app/elements/plugins/gr-popup-interface/gr-plugin-popup_html.ts

diff --git a/polygerrit-ui/app/elements/plugins/gr-popup-interface/gr-plugin-popup_html.js b/polygerrit-ui/app/elements/plugins/gr-popup-interface/gr-plugin-popup_html.ts
similarity index 93%
rename from polygerrit-ui/app/elements/plugins/gr-popup-interface/gr-plugin-popup_html.js
rename to polygerrit-ui/app/elements/plugins/gr-popup-interface/gr-plugin-popup_html.ts
index 5d2cae7..aa7a92d 100644
--- a/polygerrit-ui/app/elements/plugins/gr-popup-interface/gr-plugin-popup_html.js
+++ b/polygerrit-ui/app/elements/plugins/gr-popup-interface/gr-plugin-popup_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/plugins/gr-repo-api/gr-plugin-repo-command_html.ts

diff --git a/polygerrit-ui/app/elements/plugins/gr-repo-api/gr-plugin-repo-command_html.js b/polygerrit-ui/app/elements/plugins/gr-repo-api/gr-plugin-repo-command_html.ts
similarity index 93%
rename from polygerrit-ui/app/elements/plugins/gr-repo-api/gr-plugin-repo-command_html.js
rename to polygerrit-ui/app/elements/plugins/gr-repo-api/gr-plugin-repo-command_html.ts
index 1e5088b3..6eee643 100644
--- a/polygerrit-ui/app/elements/plugins/gr-repo-api/gr-plugin-repo-command_html.js
+++ b/polygerrit-ui/app/elements/plugins/gr-repo-api/gr-plugin-repo-command_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info_html.ts

diff --git a/polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info_html.js b/polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info_html.js
rename to polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info_html.ts
index fd94821..d69a279 100644
--- a/polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info_html.js
+++ b/polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/settings/gr-agreements-list/gr-agreements-list_html.ts

diff --git a/polygerrit-ui/app/elements/settings/gr-agreements-list/gr-agreements-list_html.js b/polygerrit-ui/app/elements/settings/gr-agreements-list/gr-agreements-list_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/settings/gr-agreements-list/gr-agreements-list_html.js
rename to polygerrit-ui/app/elements/settings/gr-agreements-list/gr-agreements-list_html.ts
index 1cd9ce2..194ca2b 100644
--- a/polygerrit-ui/app/elements/settings/gr-agreements-list/gr-agreements-list_html.js
+++ b/polygerrit-ui/app/elements/settings/gr-agreements-list/gr-agreements-list_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor_html.ts

diff --git a/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor_html.js b/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor_html.js
rename to polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor_html.ts
index d63e627..1233cf1 100644
--- a/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor_html.js
+++ b/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/settings/gr-cla-view/gr-cla-view_html.ts

diff --git a/polygerrit-ui/app/elements/settings/gr-cla-view/gr-cla-view_html.js b/polygerrit-ui/app/elements/settings/gr-cla-view/gr-cla-view_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/settings/gr-cla-view/gr-cla-view_html.js
rename to polygerrit-ui/app/elements/settings/gr-cla-view/gr-cla-view_html.ts
index b1a951b7..c461718 100644
--- a/polygerrit-ui/app/elements/settings/gr-cla-view/gr-cla-view_html.js
+++ b/polygerrit-ui/app/elements/settings/gr-cla-view/gr-cla-view_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/settings/gr-edit-preferences/gr-edit-preferences_html.ts

diff --git a/polygerrit-ui/app/elements/settings/gr-edit-preferences/gr-edit-preferences_html.js b/polygerrit-ui/app/elements/settings/gr-edit-preferences/gr-edit-preferences_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/settings/gr-edit-preferences/gr-edit-preferences_html.js
rename to polygerrit-ui/app/elements/settings/gr-edit-preferences/gr-edit-preferences_html.ts
index f2c476a..47e4592 100644
--- a/polygerrit-ui/app/elements/settings/gr-edit-preferences/gr-edit-preferences_html.js
+++ b/polygerrit-ui/app/elements/settings/gr-edit-preferences/gr-edit-preferences_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/settings/gr-email-editor/gr-email-editor_html.ts

diff --git a/polygerrit-ui/app/elements/settings/gr-email-editor/gr-email-editor_html.js b/polygerrit-ui/app/elements/settings/gr-email-editor/gr-email-editor_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/settings/gr-email-editor/gr-email-editor_html.js
rename to polygerrit-ui/app/elements/settings/gr-email-editor/gr-email-editor_html.ts
index 977e95d..525fca6 100644
--- a/polygerrit-ui/app/elements/settings/gr-email-editor/gr-email-editor_html.js
+++ b/polygerrit-ui/app/elements/settings/gr-email-editor/gr-email-editor_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/settings/gr-gpg-editor/gr-gpg-editor_html.ts

diff --git a/polygerrit-ui/app/elements/settings/gr-gpg-editor/gr-gpg-editor_html.js b/polygerrit-ui/app/elements/settings/gr-gpg-editor/gr-gpg-editor_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/settings/gr-gpg-editor/gr-gpg-editor_html.js
rename to polygerrit-ui/app/elements/settings/gr-gpg-editor/gr-gpg-editor_html.ts
index 19b8d0c..432bc4f 100644
--- a/polygerrit-ui/app/elements/settings/gr-gpg-editor/gr-gpg-editor_html.js
+++ b/polygerrit-ui/app/elements/settings/gr-gpg-editor/gr-gpg-editor_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/settings/gr-group-list/gr-group-list_html.ts

diff --git a/polygerrit-ui/app/elements/settings/gr-group-list/gr-group-list_html.js b/polygerrit-ui/app/elements/settings/gr-group-list/gr-group-list_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/settings/gr-group-list/gr-group-list_html.js
rename to polygerrit-ui/app/elements/settings/gr-group-list/gr-group-list_html.ts
index d5350aa..e52583d 100644
--- a/polygerrit-ui/app/elements/settings/gr-group-list/gr-group-list_html.js
+++ b/polygerrit-ui/app/elements/settings/gr-group-list/gr-group-list_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/settings/gr-http-password/gr-http-password_html.ts

diff --git a/polygerrit-ui/app/elements/settings/gr-http-password/gr-http-password_html.js b/polygerrit-ui/app/elements/settings/gr-http-password/gr-http-password_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/settings/gr-http-password/gr-http-password_html.js
rename to polygerrit-ui/app/elements/settings/gr-http-password/gr-http-password_html.ts
index 0474b99..41084b5 100644
--- a/polygerrit-ui/app/elements/settings/gr-http-password/gr-http-password_html.js
+++ b/polygerrit-ui/app/elements/settings/gr-http-password/gr-http-password_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/settings/gr-identities/gr-identities_html.ts

diff --git a/polygerrit-ui/app/elements/settings/gr-identities/gr-identities_html.js b/polygerrit-ui/app/elements/settings/gr-identities/gr-identities_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/settings/gr-identities/gr-identities_html.js
rename to polygerrit-ui/app/elements/settings/gr-identities/gr-identities_html.ts
index bf50124..1472103 100644
--- a/polygerrit-ui/app/elements/settings/gr-identities/gr-identities_html.js
+++ b/polygerrit-ui/app/elements/settings/gr-identities/gr-identities_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/settings/gr-menu-editor/gr-menu-editor_html.ts

diff --git a/polygerrit-ui/app/elements/settings/gr-menu-editor/gr-menu-editor_html.js b/polygerrit-ui/app/elements/settings/gr-menu-editor/gr-menu-editor_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/settings/gr-menu-editor/gr-menu-editor_html.js
rename to polygerrit-ui/app/elements/settings/gr-menu-editor/gr-menu-editor_html.ts
index ceb8958..e4d66e2 100644
--- a/polygerrit-ui/app/elements/settings/gr-menu-editor/gr-menu-editor_html.js
+++ b/polygerrit-ui/app/elements/settings/gr-menu-editor/gr-menu-editor_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/settings/gr-registration-dialog/gr-registration-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/settings/gr-registration-dialog/gr-registration-dialog_html.js b/polygerrit-ui/app/elements/settings/gr-registration-dialog/gr-registration-dialog_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/settings/gr-registration-dialog/gr-registration-dialog_html.js
rename to polygerrit-ui/app/elements/settings/gr-registration-dialog/gr-registration-dialog_html.ts
index 3559ba6..11fbbc9 100644
--- a/polygerrit-ui/app/elements/settings/gr-registration-dialog/gr-registration-dialog_html.js
+++ b/polygerrit-ui/app/elements/settings/gr-registration-dialog/gr-registration-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="gr-form-styles">

polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-item_html.ts

diff --git a/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-item_html.js b/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-item_html.ts
similarity index 92%
rename from polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-item_html.js
rename to polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-item_html.ts
index 26200d4..786abc0 100644
--- a/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-item_html.js
+++ b/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-item_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style>

polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-menu-item_html.ts

diff --git a/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-menu-item_html.js b/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-menu-item_html.ts
similarity index 93%
rename from polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-menu-item_html.js
rename to polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-menu-item_html.ts
index 95433ac..fc3edcd 100644
--- a/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-menu-item_html.js
+++ b/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-menu-item_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view_html.ts

diff --git a/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view_html.js b/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view_html.ts
similarity index 99%
rename from polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view_html.js
rename to polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view_html.ts
index 0e0f86c..e80e646 100644
--- a/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view_html.js
+++ b/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/settings/gr-ssh-editor/gr-ssh-editor_html.ts

diff --git a/polygerrit-ui/app/elements/settings/gr-ssh-editor/gr-ssh-editor_html.js b/polygerrit-ui/app/elements/settings/gr-ssh-editor/gr-ssh-editor_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/settings/gr-ssh-editor/gr-ssh-editor_html.js
rename to polygerrit-ui/app/elements/settings/gr-ssh-editor/gr-ssh-editor_html.ts
index 1f3c793..96f770a 100644
--- a/polygerrit-ui/app/elements/settings/gr-ssh-editor/gr-ssh-editor_html.js
+++ b/polygerrit-ui/app/elements/settings/gr-ssh-editor/gr-ssh-editor_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/settings/gr-watched-projects-editor/gr-watched-projects-editor_html.ts

diff --git a/polygerrit-ui/app/elements/settings/gr-watched-projects-editor/gr-watched-projects-editor_html.js b/polygerrit-ui/app/elements/settings/gr-watched-projects-editor/gr-watched-projects-editor_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/settings/gr-watched-projects-editor/gr-watched-projects-editor_html.js
rename to polygerrit-ui/app/elements/settings/gr-watched-projects-editor/gr-watched-projects-editor_html.ts
index b1ca653..e3a90a2 100644
--- a/polygerrit-ui/app/elements/settings/gr-watched-projects-editor/gr-watched-projects-editor_html.js
+++ b/polygerrit-ui/app/elements/settings/gr-watched-projects-editor/gr-watched-projects-editor_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-account-chip/gr-account-chip_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-account-chip/gr-account-chip_html.js b/polygerrit-ui/app/elements/shared/gr-account-chip/gr-account-chip_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/shared/gr-account-chip/gr-account-chip_html.js
rename to polygerrit-ui/app/elements/shared/gr-account-chip/gr-account-chip_html.ts
index 7c75488..f77b8cc 100644
--- a/polygerrit-ui/app/elements/shared/gr-account-chip/gr-account-chip_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-account-chip/gr-account-chip_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-account-entry/gr-account-entry_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-account-entry/gr-account-entry_html.js b/polygerrit-ui/app/elements/shared/gr-account-entry/gr-account-entry_html.ts
similarity index 94%
rename from polygerrit-ui/app/elements/shared/gr-account-entry/gr-account-entry_html.js
rename to polygerrit-ui/app/elements/shared/gr-account-entry/gr-account-entry_html.ts
index afd427a..c6c2b7f 100644
--- a/polygerrit-ui/app/elements/shared/gr-account-entry/gr-account-entry_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-account-entry/gr-account-entry_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-account-label/gr-account-label_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-account-label/gr-account-label_html.js b/polygerrit-ui/app/elements/shared/gr-account-label/gr-account-label_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/shared/gr-account-label/gr-account-label_html.js
rename to polygerrit-ui/app/elements/shared/gr-account-label/gr-account-label_html.ts
index c090416..c26e304 100644
--- a/polygerrit-ui/app/elements/shared/gr-account-label/gr-account-label_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-account-label/gr-account-label_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-account-link/gr-account-link_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-account-link/gr-account-link_html.js b/polygerrit-ui/app/elements/shared/gr-account-link/gr-account-link_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/shared/gr-account-link/gr-account-link_html.js
rename to polygerrit-ui/app/elements/shared/gr-account-link/gr-account-link_html.ts
index 44afb84..dfcef4e 100644
--- a/polygerrit-ui/app/elements/shared/gr-account-link/gr-account-link_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-account-link/gr-account-link_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-account-list/gr-account-list_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-account-list/gr-account-list_html.js b/polygerrit-ui/app/elements/shared/gr-account-list/gr-account-list_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/shared/gr-account-list/gr-account-list_html.js
rename to polygerrit-ui/app/elements/shared/gr-account-list/gr-account-list_html.ts
index 6fee9f3..2824bb5 100644
--- a/polygerrit-ui/app/elements/shared/gr-account-list/gr-account-list_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-account-list/gr-account-list_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-alert/gr-alert_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-alert/gr-alert_html.js b/polygerrit-ui/app/elements/shared/gr-alert/gr-alert_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/shared/gr-alert/gr-alert_html.js
rename to polygerrit-ui/app/elements/shared/gr-alert/gr-alert_html.ts
index e9f386d..d2aed40 100644
--- a/polygerrit-ui/app/elements/shared/gr-alert/gr-alert_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-alert/gr-alert_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-autocomplete-dropdown/gr-autocomplete-dropdown_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-autocomplete-dropdown/gr-autocomplete-dropdown_html.js b/polygerrit-ui/app/elements/shared/gr-autocomplete-dropdown/gr-autocomplete-dropdown_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/shared/gr-autocomplete-dropdown/gr-autocomplete-dropdown_html.js
rename to polygerrit-ui/app/elements/shared/gr-autocomplete-dropdown/gr-autocomplete-dropdown_html.ts
index fecaa73..d3d2481 100644
--- a/polygerrit-ui/app/elements/shared/gr-autocomplete-dropdown/gr-autocomplete-dropdown_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-autocomplete-dropdown/gr-autocomplete-dropdown_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-autocomplete/gr-autocomplete_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-autocomplete/gr-autocomplete_html.js b/polygerrit-ui/app/elements/shared/gr-autocomplete/gr-autocomplete_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/shared/gr-autocomplete/gr-autocomplete_html.js
rename to polygerrit-ui/app/elements/shared/gr-autocomplete/gr-autocomplete_html.ts
index c0e8abf..8ab4828 100644
--- a/polygerrit-ui/app/elements/shared/gr-autocomplete/gr-autocomplete_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-autocomplete/gr-autocomplete_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-avatar/gr-avatar_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-avatar/gr-avatar_html.js b/polygerrit-ui/app/elements/shared/gr-avatar/gr-avatar_html.ts
similarity index 93%
rename from polygerrit-ui/app/elements/shared/gr-avatar/gr-avatar_html.js
rename to polygerrit-ui/app/elements/shared/gr-avatar/gr-avatar_html.ts
index cc8a42f..0d8e78f 100644
--- a/polygerrit-ui/app/elements/shared/gr-avatar/gr-avatar_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-avatar/gr-avatar_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-button/gr-button_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-button/gr-button_html.js b/polygerrit-ui/app/elements/shared/gr-button/gr-button_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/shared/gr-button/gr-button_html.js
rename to polygerrit-ui/app/elements/shared/gr-button/gr-button_html.ts
index e992ffc..b272951 100644
--- a/polygerrit-ui/app/elements/shared/gr-button/gr-button_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-button/gr-button_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-change-star/gr-change-star_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-change-star/gr-change-star_html.js b/polygerrit-ui/app/elements/shared/gr-change-star/gr-change-star_html.ts
similarity index 95%
rename from polygerrit-ui/app/elements/shared/gr-change-star/gr-change-star_html.js
rename to polygerrit-ui/app/elements/shared/gr-change-star/gr-change-star_html.ts
index 3b7b1af..c7930c0 100644
--- a/polygerrit-ui/app/elements/shared/gr-change-star/gr-change-star_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-change-star/gr-change-star_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-change-status/gr-change-status_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-change-status/gr-change-status_html.js b/polygerrit-ui/app/elements/shared/gr-change-status/gr-change-status_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/shared/gr-change-status/gr-change-status_html.js
rename to polygerrit-ui/app/elements/shared/gr-change-status/gr-change-status_html.ts
index 38e620f..542d8be 100644
--- a/polygerrit-ui/app/elements/shared/gr-change-status/gr-change-status_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-change-status/gr-change-status_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_html.js b/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_html.js
rename to polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_html.ts
index 837a58f..4c15383 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-comment/gr-comment_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment_html.js b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment_html.ts
similarity index 99%
rename from polygerrit-ui/app/elements/shared/gr-comment/gr-comment_html.js
rename to polygerrit-ui/app/elements/shared/gr-comment/gr-comment_html.ts
index 47ac8a6..a9d2491 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-confirm-delete-comment-dialog/gr-confirm-delete-comment-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-confirm-delete-comment-dialog/gr-confirm-delete-comment-dialog_html.js b/polygerrit-ui/app/elements/shared/gr-confirm-delete-comment-dialog/gr-confirm-delete-comment-dialog_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/shared/gr-confirm-delete-comment-dialog/gr-confirm-delete-comment-dialog_html.js
rename to polygerrit-ui/app/elements/shared/gr-confirm-delete-comment-dialog/gr-confirm-delete-comment-dialog_html.ts
index 2d0fa6f..6876c1a 100644
--- a/polygerrit-ui/app/elements/shared/gr-confirm-delete-comment-dialog/gr-confirm-delete-comment-dialog_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-confirm-delete-comment-dialog/gr-confirm-delete-comment-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-copy-clipboard/gr-copy-clipboard_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-copy-clipboard/gr-copy-clipboard_html.js b/polygerrit-ui/app/elements/shared/gr-copy-clipboard/gr-copy-clipboard_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/shared/gr-copy-clipboard/gr-copy-clipboard_html.js
rename to polygerrit-ui/app/elements/shared/gr-copy-clipboard/gr-copy-clipboard_html.ts
index 9fc83c8..197c94c 100644
--- a/polygerrit-ui/app/elements/shared/gr-copy-clipboard/gr-copy-clipboard_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-copy-clipboard/gr-copy-clipboard_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-cursor-manager/gr-cursor-manager_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-cursor-manager/gr-cursor-manager_html.js b/polygerrit-ui/app/elements/shared/gr-cursor-manager/gr-cursor-manager_html.ts
similarity index 91%
rename from polygerrit-ui/app/elements/shared/gr-cursor-manager/gr-cursor-manager_html.js
rename to polygerrit-ui/app/elements/shared/gr-cursor-manager/gr-cursor-manager_html.ts
index 3ed33d1..1489006 100644
--- a/polygerrit-ui/app/elements/shared/gr-cursor-manager/gr-cursor-manager_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-cursor-manager/gr-cursor-manager_html.ts
@@ -14,6 +14,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html``;

polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter_html.js b/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter_html.ts
similarity index 93%
rename from polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter_html.js
rename to polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter_html.ts
index 2571065..a5dd6d0 100644
--- a/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-dialog/gr-dialog_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-dialog/gr-dialog_html.js b/polygerrit-ui/app/elements/shared/gr-dialog/gr-dialog_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/shared/gr-dialog/gr-dialog_html.js
rename to polygerrit-ui/app/elements/shared/gr-dialog/gr-dialog_html.ts
index 54b404d..f8ddcfd 100644
--- a/polygerrit-ui/app/elements/shared/gr-dialog/gr-dialog_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-dialog/gr-dialog_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-diff-preferences/gr-diff-preferences_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-diff-preferences/gr-diff-preferences_html.js b/polygerrit-ui/app/elements/shared/gr-diff-preferences/gr-diff-preferences_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/shared/gr-diff-preferences/gr-diff-preferences_html.js
rename to polygerrit-ui/app/elements/shared/gr-diff-preferences/gr-diff-preferences_html.ts
index 3ea40d9..f9d971d 100644
--- a/polygerrit-ui/app/elements/shared/gr-diff-preferences/gr-diff-preferences_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-diff-preferences/gr-diff-preferences_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-download-commands/gr-download-commands_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-download-commands/gr-download-commands_html.js b/polygerrit-ui/app/elements/shared/gr-download-commands/gr-download-commands_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/shared/gr-download-commands/gr-download-commands_html.js
rename to polygerrit-ui/app/elements/shared/gr-download-commands/gr-download-commands_html.ts
index 7248e65..3bf0e87 100644
--- a/polygerrit-ui/app/elements/shared/gr-download-commands/gr-download-commands_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-download-commands/gr-download-commands_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list_html.js b/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list_html.js
rename to polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list_html.ts
index 0f80af2..629b0ad 100644
--- a/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-dropdown/gr-dropdown_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-dropdown/gr-dropdown_html.js b/polygerrit-ui/app/elements/shared/gr-dropdown/gr-dropdown_html.ts
similarity index 98%
rename from polygerrit-ui/app/elements/shared/gr-dropdown/gr-dropdown_html.js
rename to polygerrit-ui/app/elements/shared/gr-dropdown/gr-dropdown_html.ts
index 6617a0e..8ea0d21 100644
--- a/polygerrit-ui/app/elements/shared/gr-dropdown/gr-dropdown_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-dropdown/gr-dropdown_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-editable-content/gr-editable-content_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-editable-content/gr-editable-content_html.js b/polygerrit-ui/app/elements/shared/gr-editable-content/gr-editable-content_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/shared/gr-editable-content/gr-editable-content_html.js
rename to polygerrit-ui/app/elements/shared/gr-editable-content/gr-editable-content_html.ts
index 24eb0b0..81a2c2f 100644
--- a/polygerrit-ui/app/elements/shared/gr-editable-content/gr-editable-content_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-editable-content/gr-editable-content_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label_html.js b/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label_html.js
rename to polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label_html.ts
index a226e30..5e36166 100644
--- a/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-fixed-panel/gr-fixed-panel_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-fixed-panel/gr-fixed-panel_html.js b/polygerrit-ui/app/elements/shared/gr-fixed-panel/gr-fixed-panel_html.ts
similarity index 95%
rename from polygerrit-ui/app/elements/shared/gr-fixed-panel/gr-fixed-panel_html.js
rename to polygerrit-ui/app/elements/shared/gr-fixed-panel/gr-fixed-panel_html.ts
index 61e8b24..ce475c6 100644
--- a/polygerrit-ui/app/elements/shared/gr-fixed-panel/gr-fixed-panel_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-fixed-panel/gr-fixed-panel_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-formatted-text/gr-formatted-text_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-formatted-text/gr-formatted-text_html.js b/polygerrit-ui/app/elements/shared/gr-formatted-text/gr-formatted-text_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/shared/gr-formatted-text/gr-formatted-text_html.js
rename to polygerrit-ui/app/elements/shared/gr-formatted-text/gr-formatted-text_html.ts
index 5cb8670..468bbee 100644
--- a/polygerrit-ui/app/elements/shared/gr-formatted-text/gr-formatted-text_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-formatted-text/gr-formatted-text_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account_html.js b/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account_html.js
rename to polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account_html.ts
index 262b089..18138c3 100644
--- a/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account_html.ts
@@ -14,8 +14,8 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import '../gr-hovercard/gr-hovercard-shared-style.js';
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import '../gr-hovercard/gr-hovercard-shared-style';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="gr-hovercard-shared-style">

polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard-shared-style.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard-shared-style.js b/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard-shared-style.ts
similarity index 87%
rename from polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard-shared-style.js
rename to polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard-shared-style.ts
index 5fb1add..aa17acaf 100644
--- a/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard-shared-style.js
+++ b/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard-shared-style.ts
@@ -15,6 +15,11 @@
  * limitations under the License.
  */
 
+// Mark the file as a module. Otherwise typescript assumes this is a script
+// and $_documentContainer is a global variable.
+// See: https://www.typescriptlang.org/docs/handbook/modules.html
+export {};
+
 /** The shared styles for all hover cards. */
 const GrHoverCardSharedStyle = document.createElement('dom-module');
 GrHoverCardSharedStyle.innerHTML =

polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard_html.js b/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard_html.ts
similarity index 92%
rename from polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard_html.js
rename to polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard_html.ts
index 67a3545..830cbd878 100644
--- a/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="gr-hovercard-shared-style">

polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info_html.js b/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info_html.js
rename to polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info_html.ts
index 1722d02..dbc3b5e 100644
--- a/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="gr-voting-styles">

polygerrit-ui/app/elements/shared/gr-label/gr-label_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-label/gr-label_html.js b/polygerrit-ui/app/elements/shared/gr-label/gr-label_html.ts
similarity index 91%
rename from polygerrit-ui/app/elements/shared/gr-label/gr-label_html.js
rename to polygerrit-ui/app/elements/shared/gr-label/gr-label_html.ts
index c4310fc..94196df 100644
--- a/polygerrit-ui/app/elements/shared/gr-label/gr-label_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-label/gr-label_html.ts
@@ -14,6 +14,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html` <slot></slot> `;

polygerrit-ui/app/elements/shared/gr-labeled-autocomplete/gr-labeled-autocomplete_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-labeled-autocomplete/gr-labeled-autocomplete_html.js b/polygerrit-ui/app/elements/shared/gr-labeled-autocomplete/gr-labeled-autocomplete_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/shared/gr-labeled-autocomplete/gr-labeled-autocomplete_html.js
rename to polygerrit-ui/app/elements/shared/gr-labeled-autocomplete/gr-labeled-autocomplete_html.ts
index 615a525..fa50624 100644
--- a/polygerrit-ui/app/elements/shared/gr-labeled-autocomplete/gr-labeled-autocomplete_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-labeled-autocomplete/gr-labeled-autocomplete_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-lib-loader/gr-lib-loader_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-lib-loader/gr-lib-loader_html.js b/polygerrit-ui/app/elements/shared/gr-lib-loader/gr-lib-loader_html.ts
similarity index 91%
rename from polygerrit-ui/app/elements/shared/gr-lib-loader/gr-lib-loader_html.js
rename to polygerrit-ui/app/elements/shared/gr-lib-loader/gr-lib-loader_html.ts
index 204aa87..f34f99e 100644
--- a/polygerrit-ui/app/elements/shared/gr-lib-loader/gr-lib-loader_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-lib-loader/gr-lib-loader_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <gr-js-api-interface id="jsAPI"></gr-js-api-interface>

polygerrit-ui/app/elements/shared/gr-limited-text/gr-limited-text_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-limited-text/gr-limited-text_html.js b/polygerrit-ui/app/elements/shared/gr-limited-text/gr-limited-text_html.ts
similarity index 91%
rename from polygerrit-ui/app/elements/shared/gr-limited-text/gr-limited-text_html.js
rename to polygerrit-ui/app/elements/shared/gr-limited-text/gr-limited-text_html.ts
index 6bcce8c..b942d07 100644
--- a/polygerrit-ui/app/elements/shared/gr-limited-text/gr-limited-text_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-limited-text/gr-limited-text_html.ts
@@ -14,6 +14,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html` [[_computeDisplayText(text, limit)]] `;

polygerrit-ui/app/elements/shared/gr-linked-chip/gr-linked-chip_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-linked-chip/gr-linked-chip_html.js b/polygerrit-ui/app/elements/shared/gr-linked-chip/gr-linked-chip_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/shared/gr-linked-chip/gr-linked-chip_html.js
rename to polygerrit-ui/app/elements/shared/gr-linked-chip/gr-linked-chip_html.ts
index f1f5f46..a335db7 100644
--- a/polygerrit-ui/app/elements/shared/gr-linked-chip/gr-linked-chip_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-linked-chip/gr-linked-chip_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-linked-text/gr-linked-text_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-linked-text/gr-linked-text_html.js b/polygerrit-ui/app/elements/shared/gr-linked-text/gr-linked-text_html.ts
similarity index 94%
rename from polygerrit-ui/app/elements/shared/gr-linked-text/gr-linked-text_html.js
rename to polygerrit-ui/app/elements/shared/gr-linked-text/gr-linked-text_html.ts
index 59bed1e..4bdc1ab 100644
--- a/polygerrit-ui/app/elements/shared/gr-linked-text/gr-linked-text_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-linked-text/gr-linked-text_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view_html.js b/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view_html.js
rename to polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view_html.ts
index ff73d4d8..75ee667 100644
--- a/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay_html.js b/polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay_html.ts
similarity index 94%
rename from polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay_html.js
rename to polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay_html.ts
index 7123adb..730eeac 100644
--- a/polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-page-nav/gr-page-nav_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-page-nav/gr-page-nav_html.js b/polygerrit-ui/app/elements/shared/gr-page-nav/gr-page-nav_html.ts
similarity index 94%
rename from polygerrit-ui/app/elements/shared/gr-page-nav/gr-page-nav_html.js
rename to polygerrit-ui/app/elements/shared/gr-page-nav/gr-page-nav_html.ts
index c5e9142..facc4f8 100644
--- a/polygerrit-ui/app/elements/shared/gr-page-nav/gr-page-nav_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-page-nav/gr-page-nav_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-repo-branch-picker/gr-repo-branch-picker_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-repo-branch-picker/gr-repo-branch-picker_html.js b/polygerrit-ui/app/elements/shared/gr-repo-branch-picker/gr-repo-branch-picker_html.ts
similarity index 95%
rename from polygerrit-ui/app/elements/shared/gr-repo-branch-picker/gr-repo-branch-picker_html.js
rename to polygerrit-ui/app/elements/shared/gr-repo-branch-picker/gr-repo-branch-picker_html.ts
index 0ce885a..934b3cb 100644
--- a/polygerrit-ui/app/elements/shared/gr-repo-branch-picker/gr-repo-branch-picker_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-repo-branch-picker/gr-repo-branch-picker_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-shell-command/gr-shell-command_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-shell-command/gr-shell-command_html.js b/polygerrit-ui/app/elements/shared/gr-shell-command/gr-shell-command_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/shared/gr-shell-command/gr-shell-command_html.js
rename to polygerrit-ui/app/elements/shared/gr-shell-command/gr-shell-command_html.ts
index 4a4480e..ef76999 100644
--- a/polygerrit-ui/app/elements/shared/gr-shell-command/gr-shell-command_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-shell-command/gr-shell-command_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea_html.js b/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea_html.ts
similarity index 97%
rename from polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea_html.js
rename to polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea_html.ts
index 8454f62..1f777aa 100644
--- a/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">

polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content_html.js b/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content_html.ts
similarity index 93%
rename from polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content_html.js
rename to polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content_html.ts
index e5a2813..952420d 100644
--- a/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style>

polygerrit-ui/app/elements/shared/gr-tooltip/gr-tooltip_html.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-tooltip/gr-tooltip_html.js b/polygerrit-ui/app/elements/shared/gr-tooltip/gr-tooltip_html.ts
similarity index 96%
rename from polygerrit-ui/app/elements/shared/gr-tooltip/gr-tooltip_html.js
rename to polygerrit-ui/app/elements/shared/gr-tooltip/gr-tooltip_html.ts
index 3f02fc5..d59a6c3 100644
--- a/polygerrit-ui/app/elements/shared/gr-tooltip/gr-tooltip_html.js
+++ b/polygerrit-ui/app/elements/shared/gr-tooltip/gr-tooltip_html.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
+import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
   <style include="shared-styles">