feat: local storage helper

Author: KatoakDR

electron/renderer/lib/local-storage.ts

@@ -0,0 +1,32 @@
+export const hasLocalStorage = (): boolean => {
+  return typeof localStorage !== 'undefined';
+};
+
+export const LocalStorage = {
+  /**
+   * Gets a JSON value from local storage for the given key.
+   * If either local storage isn't defined or key not found then
+   * returns undefined.
+   */
+  get: <T>(key: string): T | undefined => {
+    if (!hasLocalStorage()) {
+      return;
+    }
+    const value = localStorage.getItem(key);
+    if (value) {
+      return JSON.parse(value);
+    }
+    return;
+  },
+  /**
+   * Sets a JSON value in local storage for the given key.
+   * The value should be JSON serializable.
+   * For example, not a `Map` or `Set` because those become `{}`.
+   */
+  set: <T>(key: string, value: T): void => {
+    if (!hasLocalStorage()) {
+      return;
+    }
+    localStorage.setItem(key, JSON.stringify(value));
+  },
+};