draft pref

src/preferences/Preference.ts

@@ -0,0 +1,22 @@
+export class Preference<T> {
+    private key: string;
+    private description: string;
+    private value?: T;
+    private defaultValue?: T;
+
+    constructor(key: string, description: string, defaultValue?: T) {
+        this.key = key;
+        this.description = description;
+        this.defaultValue = defaultValue;
+        this.value = this.load();
+    }
+
+    private load() {
+        const value = localStorage.getItem(this.key);
+
+        if (value) {
+            return JSON.parse(value);
+        }
+        return this.defaultValue;
+    }
+}