imported useNotifications, new memory storage hook and fixed but in localstorage

packages/web-util/src/hooks/index.ts

@@ -1,5 +1,11 @@
 export { useLang } from "./useLang.js";
 export { useLocalStorage } from "./useLocalStorage.js";
+export { useMemoryStorage } from "./useMemoryStorage.js";
+export {
+  useNotifications,
+  notifyError,
+  notifyInfo,
+} from "./useNotifications.js";
 export {
   useAsyncAsHook,
   HookError,

packages/web-util/src/hooks/useLocalStorage.ts

@@ -70,7 +70,7 @@ export function useLocalStorage(
   }, []);
 
   const setValue = (value?: string): void => {
-    if (!value) {
+    if (value === undefined) {
       storage.delete(key);
     } else {
       storage.set(key, value);

packages/web-util/src/hooks/useMemoryStorage.ts

@@ -0,0 +1,75 @@
+/*
+ This file is part of GNU Anastasis
+ (C) 2021-2022 Anastasis SARL
+
+ GNU Anastasis is free software; you can redistribute it and/or modify it under the
+ terms of the GNU Affero General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ GNU Anastasis 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 Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License along with
+ GNU Anastasis; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+/**
+ *
+ * @author Sebastian Javier Marchano (sebasjm)
+ */
+
+import { useEffect, useState } from "preact/hooks";
+import {
+  ObservableMap,
+  browserStorageMap,
+  localStorageMap,
+  memoryMap,
+} from "../utils/observable.js";
+
+export interface LocalStorageState {
+  value?: string;
+  update: (s: string) => void;
+  reset: () => void;
+}
+
+const storage: ObservableMap<string, string> = memoryMap<string>();
+
+export function useMemoryStorage(
+  key: string,
+  initialValue: string,
+): Required<LocalStorageState>;
+export function useMemoryStorage(key: string): LocalStorageState;
+export function useMemoryStorage(
+  key: string,
+  initialValue?: string,
+): LocalStorageState {
+  const [storedValue, setStoredValue] = useState<string | undefined>(
+    (): string | undefined => {
+      return storage.get(key) ?? initialValue;
+    },
+  );
+
+  useEffect(() => {
+    return storage.onUpdate(key, () => {
+      const newValue = storage.get(key);
+      setStoredValue(newValue ?? initialValue);
+    });
+  }, []);
+
+  const setValue = (value?: string): void => {
+    if (value === undefined) {
+      storage.delete(key);
+    } else {
+      storage.set(key, value);
+    }
+  };
+
+  return {
+    value: storedValue,
+    update: setValue,
+    reset: () => {
+      setValue(initialValue);
+    },
+  };
+}

packages/web-util/src/hooks/useNotifications.ts

@@ -0,0 +1,67 @@
+import { TranslatedString } from "@gnu-taler/taler-util";
+import { StateUpdater, useEffect, useState } from "preact/hooks";
+import { memoryMap } from "../index.browser.js";
+
+export type NotificationMessage = ErrorNotification | InfoNotification;
+
+interface ErrorNotification {
+  type: "error";
+  title: TranslatedString;
+  description?: TranslatedString;
+  debug?: string;
+}
+interface InfoNotification {
+  type: "info";
+  title: TranslatedString;
+}
+
+const storage = memoryMap<NotificationMessage[]>();
+const NOTIFICATION_KEY = "notification";
+
+export function notifyError(
+  title: TranslatedString,
+  description: TranslatedString | undefined,
+  debug?: any,
+) {
+  const currentState: NotificationMessage[] =
+    storage.get(NOTIFICATION_KEY) ?? [];
+  const newState = currentState.concat({
+    type: "error",
+    title,
+    description,
+    debug,
+  });
+  storage.set(NOTIFICATION_KEY, newState);
+}
+export function notifyInfo(title: TranslatedString) {
+  const currentState: NotificationMessage[] =
+    storage.get(NOTIFICATION_KEY) ?? [];
+  const newState = currentState.concat({ type: "info", title });
+  storage.set(NOTIFICATION_KEY, newState);
+}
+
+type Notification = {
+  message: NotificationMessage;
+  remove: () => void;
+};
+
+export function useNotifications(): Notification[] {
+  const [value, setter] = useState<NotificationMessage[]>([]);
+  useEffect(() => {
+    return storage.onUpdate(NOTIFICATION_KEY, () => {
+      const mem = storage.get(NOTIFICATION_KEY) ?? [];
+      setter(mem);
+    });
+  });
+  return value.map((message, idx) => {
+    return {
+      message,
+      remove: () => {
+        const mem = storage.get(NOTIFICATION_KEY) ?? [];
+        const newState = Array.from(mem);
+        newState.splice(idx, 1);
+        storage.set(NOTIFICATION_KEY, newState);
+      },
+    };
+  });
+}