refactor(stores): Generic persistent storage facility

1 files changed, 19 insertions, 0 deletions

diff --git a/src/lib/Utility/persistentStore.ts b/src/lib/Utility/persistentStore.ts
new file mode 100644
index 00000000..b08c825c
--- /dev/null
+++ b/src/lib/Utility/persistentStore.ts
@@ -0,0 +1,19 @@
+import { writable, type Writable } from 'svelte/store';
+import { browser } from '$app/environment';
+
+export const persistentStore = <T>(key: string, initial: T): Writable<T> => {
+  const store = writable<T>(initial);
+
+  if (browser)
+    import('localforage').then((localforage) => {
+      localforage.default.getItem<T>(key).then((value) => {
+        if (value !== null) store.set(value);
+      });
+
+      store.subscribe((value) => {
+        localforage.default.setItem(key, value);
+      });
+    });
+
+  return store;
+};