Convert hui-text-entity-row to TypeScript/LitElement (#2017)

* Convert hui-text-entity-row to TypeScript/LitElement

* Address review comments

* Fix Travis errors

src/panels/lovelace/entity-rows/hui-text-entity-row.ts

@@ -0,0 +1,74 @@
+import { html, LitElement, PropertyDeclarations } from "@polymer/lit-element";
+import { TemplateResult } from "lit-html";
+
+import "../components/hui-generic-entity-row";
+import "./hui-error-entity-row";
+
+import computeStateDisplay from "../../../common/entity/compute_state_display";
+import { hassLocalizeLitMixin } from "../../../mixins/lit-localize-mixin";
+import { HomeAssistant } from "../../../types";
+import { EntityRow, EntityConfig } from "./types";
+
+class HuiTextEntityRow extends hassLocalizeLitMixin(LitElement)
+  implements EntityRow {
+  public hass?: HomeAssistant;
+  private _config?: EntityConfig;
+
+  static get properties(): PropertyDeclarations {
+    return {
+      hass: {},
+      _config: {},
+    };
+  }
+
+  public setConfig(config: EntityConfig): void {
+    if (!config) {
+      throw new Error("Configuration error");
+    }
+    this._config = config;
+  }
+
+  protected render(): TemplateResult {
+    if (!this._config || !this.hass) {
+      return html``;
+    }
+
+    const stateObj = this.hass.states[this._config.entity];
+
+    if (!stateObj) {
+      return html`
+        <hui-error-entity-row
+          .entity="${this._config.entity}"
+        ></hui-error-entity-row>
+      `;
+    }
+
+    return html`
+      ${this.renderStyle()}
+      <hui-generic-entity-row .hass="${this.hass}" .config="${this._config}">
+        >
+        <div>
+          ${computeStateDisplay(this.localize, stateObj, this.hass.language)}
+        </div>
+      </hui-generic-entity-row>
+    `;
+  }
+
+  private renderStyle(): TemplateResult {
+    return html`
+      <style>
+        div {
+          text-align: right;
+        }
+      </style>
+    `;
+  }
+}
+
+declare global {
+  interface HTMLElementTagNameMap {
+    "hui-text-entity-row": HuiTextEntityRow;
+  }
+}
+
+customElements.define("hui-text-entity-row", HuiTextEntityRow);