component example

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diff --git a/packages/demobank-ui/src/components/EmptyComponentExample/index.ts b/packages/demobank-ui/src/components/EmptyComponentExample/index.ts
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+/*
+ This file is part of GNU Taler
+ (C) 2022 Taler Systems S.A.
+
+ GNU Taler is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+import { Loading } from "../../components/Loading.js";
+import { HookError } from "../../hooks/useAsyncAsHook.js";
+import { compose, StateViewMap } from "../../utils/index.js";
+import { wxApi } from "../../wxApi.js";
+import { useComponentState } from "./state.js";
+import { LoadingUriView, ReadyView } from "./views.js";
+
+export interface Props {
+  p: string;
+}
+
+export type State = State.Loading | State.LoadingUriError | State.Ready;
+
+export namespace State {
+  export interface Loading {
+    status: "loading";
+    error: undefined;
+  }
+
+  export interface LoadingUriError {
+    status: "loading-error";
+    error: HookError;
+  }
+
+  export interface BaseInfo {
+    error: undefined;
+  }
+  export interface Ready extends BaseInfo {
+    status: "ready";
+    error: undefined;
+  }
+}
+
+const viewMapping: StateViewMap<State> = {
+  loading: Loading,
+  "loading-error": LoadingUriView,
+  ready: ReadyView,
+};
+
+export const ComponentName = compose(
+  "ComponentName",
+  (p: Props) => useComponentState(p, wxApi),
+  viewMapping,
+);