Fix Lit lint warnings (#10112)

gallery/src/demos/demo-automation-trace-timeline.ts

@@ -1,3 +1,4 @@
+/* eslint-disable lit/no-template-arrow */
 import { html, css, LitElement, TemplateResult } from "lit";
 import { customElement, property } from "lit/decorators";
 import "../../../src/components/ha-card";

gallery/src/demos/demo-automation-trace.ts

@@ -1,3 +1,4 @@
+/* eslint-disable lit/no-template-arrow */
 import { html, css, LitElement, TemplateResult } from "lit";
 import "../../../src/components/ha-card";
 import "../../../src/components/trace/hat-script-graph";

hassio/src/components/supervisor-backup-content.ts

@@ -181,9 +181,7 @@ export class SupervisorBackupContent extends LitElement {
                   >
                     <ha-checkbox
                       .checked=${this.homeAssistant}
-                      @click=${() => {
-                        this.homeAssistant = !this.homeAssistant;
-                      }}
+                      @click=${this.toggleHomeAssistant}
                     >
                     </ha-checkbox>
                   </ha-formfield>
@@ -272,6 +270,10 @@ export class SupervisorBackupContent extends LitElement {
     `;
   }
 
+  private toggleHomeAssistant() {
+    this.homeAssistant = !this.homeAssistant;
+  }
+
   static get styles(): CSSResultGroup {
     return css`
       .partial-picker ha-formfield {

hassio/src/dialogs/backup/dialog-hassio-backup.ts

@@ -28,6 +28,7 @@ import "../../components/supervisor-backup-content";
 import type { SupervisorBackupContent } from "../../components/supervisor-backup-content";
 import { HassioBackupDialogParams } from "./show-dialog-hassio-backup";
 import { atLeastVersion } from "../../../../src/common/config/version";
+import { stopPropagation } from "../../../../src/common/dom/stop_propagation";
 
 @customElement("dialog-hassio-backup")
 class HassioBackupDialog
@@ -107,7 +108,7 @@ class HassioBackupDialog
               fixed
               slot="primaryAction"
               @action=${this._handleMenuAction}
-              @closed=${(ev: Event) => ev.stopPropagation()}
+              @closed=${stopPropagation}
             >
               <mwc-icon-button slot="trigger" alt="menu">
                 <ha-svg-icon .path=${mdiDotsVertical}></ha-svg-icon>

hassio/src/system/hassio-host-info.ts

@@ -184,23 +184,34 @@ class HassioHostInfo extends LitElement {
             <mwc-icon-button slot="trigger">
               <ha-svg-icon .path=${mdiDotsVertical}></ha-svg-icon>
             </mwc-icon-button>
-            <mwc-list-item @click=${() => this._handleMenuAction("hardware")}>
+            <mwc-list-item
+              .action=${"hardware"}
+              @click=${this._handleMenuAction}
+            >
               ${this.supervisor.localize("system.host.hardware")}
             </mwc-list-item>
             ${this.supervisor.host.features.includes("haos")
-              ? html`<mwc-list-item
-                    @click=${() => this._handleMenuAction("import_from_usb")}
+              ? html`
+                  <mwc-list-item
+                    .action=${"import_from_usb"}
+                    @click=${this._handleMenuAction}
                   >
                     ${this.supervisor.localize("system.host.import_from_usb")}
                   </mwc-list-item>
                   ${this.supervisor.host.features.includes("os_agent") &&
                   atLeastVersion(this.supervisor.host.agent_version, 1, 2, 0)
-                    ? html`<mwc-list-item
-                        @click=${() => this._handleMenuAction("move_datadisk")}
-                      >
-                        ${this.supervisor.localize("system.host.move_datadisk")}
-                      </mwc-list-item>`
-                    : ""} `
+                    ? html`
+                        <mwc-list-item
+                          .action=${"move_datadisk"}
+                          @click=${this._handleMenuAction}
+                        >
+                          ${this.supervisor.localize(
+                            "system.host.move_datadisk"
+                          )}
+                        </mwc-list-item>
+                      `
+                    : ""}
+                `
               : ""}
           </ha-button-menu>
         </div>
@@ -223,8 +234,8 @@ class HassioHostInfo extends LitElement {
     return network_info.interfaces.find((a) => a.primary)?.ipv4?.address![0];
   });
 
-  private async _handleMenuAction(action: string) {
-    switch (action) {
+  private async _handleMenuAction(ev) {
+    switch ((ev.target as any).action) {
       case "hardware":
         await this._showHardware();
         break;

src/components/ha-selector/ha-selector-area.ts

@@ -39,8 +39,8 @@ export class HaAreaSelector extends LitElement {
       .value=${this.value}
       .label=${this.label}
       no-add
-      .deviceFilter=${(device) => this._filterDevices(device)}
-      .entityFilter=${(entity) => this._filterEntities(entity)}
+      .deviceFilter=${this._filterDevices}
+      .entityFilter=${this._filterEntities}
       .includeDeviceClasses=${this.selector.area.entity?.device_class
         ? [this.selector.area.entity.device_class]
         : undefined}
@@ -51,16 +51,16 @@ export class HaAreaSelector extends LitElement {
     ></ha-area-picker>`;
   }
 
-  private _filterEntities(entity: EntityRegistryEntry): boolean {
+  private _filterEntities = (entity: EntityRegistryEntry): boolean => {
     if (this.selector.area.entity?.integration) {
       if (entity.platform !== this.selector.area.entity.integration) {
         return false;
       }
     }
     return true;
-  }
+  };
 
-  private _filterDevices(device: DeviceRegistryEntry): boolean {
+  private _filterDevices = (device: DeviceRegistryEntry): boolean => {
     if (
       this.selector.area.device?.manufacturer &&
       device.manufacturer !== this.selector.area.device.manufacturer
@@ -84,7 +84,7 @@ export class HaAreaSelector extends LitElement {
       }
     }
     return true;
-  }
+  };
 
   private async _loadConfigEntries() {
     this._configEntries = (await getConfigEntries(this.hass)).filter(