Merge pull request #123 from robonen/vue-composable-categories

feat(web/vue): add useStorage and useStorageAsync, separate all composables by categories

core/platform/vitest.config.ts

@@ -0,0 +1,8 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    environment: 'jsdom',
+  },
+});
+

core/stdlib/vitest.config.ts

@@ -0,0 +1,7 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    environment: 'node',
+  },
+});

vitest.config.ts

@@ -3,16 +3,10 @@ import { defineConfig } from 'vitest/config';
 export default defineConfig({
   test: {
     projects: [
-      {
+      'core/stdlib/vitest.config.ts',
-        extends: true,
+      'core/platform/vitest.config.ts',
-        test: {
+      'web/vue/vitest.config.ts',
-          typecheck: {
-            enabled: false,
-          },
-        },
-      },
     ],
-    environment: 'jsdom',
     coverage: {
       provider: 'v8',
       include: ['core/*', 'web/*'],

web/vue/src/composables/browser/index.ts

@@ -0,0 +1,3 @@
+export * from './useEventListener';
+export * from './useFocusGuard';
+export * from './useSupported';

web/vue/src/composables/browser/useEventListener/index.ts

@@ -1,6 +1,6 @@
 import { isArray, isString, noop, type Arrayable, type VoidFunction } from '@robonen/stdlib';
 import type { MaybeRefOrGetter } from 'vue';
-import { defaultWindow } from '../..';
+import { defaultWindow } from '@/types';
 
 // TODO: wip
 
@@ -19,7 +19,7 @@ export type ElementEventName = keyof HTMLElementEventMap;
 
 /**
  * @name useEventListener
- * @category Elements
+ * @category Browser
  * @description Registers an event listener using the `addEventListener` on mounted and removes it automatically on unmounted
  * 
  * Overload 1: Omitted window target
@@ -32,7 +32,7 @@ export function useEventListener<E extends WindowEventName>(
 
 /**
  * @name useEventListener
- * @category Elements
+ * @category Browser
  * @description Registers an event listener using the `addEventListener` on mounted and removes it automatically on unmounted
  * 
  * Overload 2: Explicit window target
@@ -46,7 +46,7 @@ export function useEventListener<E extends WindowEventName>(
 
 /**
  * @name useEventListener
- * @category Elements
+ * @category Browser
  * @description Registers an event listener using the `addEventListener` on mounted and removes it automatically on unmounted
  * 
  * Overload 3: Explicit document target
@@ -60,7 +60,7 @@ export function useEventListener<E extends DocumentEventName>(
 
 /**
  * @name useEventListener
- * @category Elements
+ * @category Browser
  * @description Registers an event listener using the `addEventListener` on mounted and removes it automatically on unmounted
  * 
  * Overload 4: Explicit HTMLElement target
@@ -74,7 +74,7 @@ export function useEventListener<E extends ElementEventName>(
 
 /**
  * @name useEventListener
- * @category Elements
+ * @category Browser
  * @description Registers an event listener using the `addEventListener` on mounted and removes it automatically on unmounted
  * 
  * Overload 5: Custom target with inferred event type
@@ -88,7 +88,7 @@ export function useEventListener<Names extends string, EventType = Event>(
 
 /**
  * @name useEventListener
- * @category Elements
+ * @category Browser
  * @description Registers an event listener using the `addEventListener` on mounted and removes it automatically on unmounted
  * 
  * Overload 6: Custom event target fallback

web/vue/src/composables/browser/useFocusGuard/index.ts

@@ -6,7 +6,7 @@ let counter = 0;
 
 /**
  * @name useFocusGuard
- * @category Utilities
+ * @category Browser
  * @description Adds a pair of focus guards at the boundaries of the DOM tree to ensure consistent focus behavior
  * 
  * @param {string} [namespace] - A namespace to group the focus guards

web/vue/src/composables/browser/useSupported/index.ts

@@ -1,9 +1,9 @@
 import { computed } from 'vue';
-import { useMounted } from '../useMounted';
+import { useMounted } from '@/composables/lifecycle/useMounted';
 
 /**
  * @name useSupported
- * @category Utilities
+ * @category Browser
  * @description SSR-friendly way to check if a feature is supported
  * 
  * @param {Function} feature The feature to check for support

web/vue/src/composables/component/index.ts

@@ -0,0 +1,3 @@
+export * from './unrefElement';
+export * from './useRenderCount';
+export * from './useRenderInfo';

web/vue/src/composables/component/unrefElement/index.ts

@@ -11,7 +11,7 @@ export type UnRefElementReturn<T extends MaybeElement = MaybeElement> = T extend
 
 /**
  * @name unrefElement
- * @category Components
+ * @category Component
  * @description Unwraps a Vue element reference to get the underlying instance or DOM element.
  *
  * @param {MaybeComputedElementRef<El>} elRef - The element reference to unwrap.

web/vue/src/composables/component/useRenderCount/index.ts

@@ -1,10 +1,10 @@
 import { onMounted, onUpdated, readonly, type ComponentInternalInstance } from 'vue';
-import { useCounter } from '../useCounter';
+import { useCounter } from '@/composables/state/useCounter';
-import { getLifeCycleTarger } from '../..';
+import { getLifeCycleTarger } from '@/utils';
 
 /**
  * @name useRenderCount
- * @category Components
+ * @category Component
  * @description Returns the number of times the component has been rendered into the DOM
  * 
  * @param {ComponentInternalInstance} [instance] The component instance to track the render count for

web/vue/src/composables/component/useRenderInfo/index.ts

@@ -1,11 +1,11 @@
 import { timestamp } from '@robonen/stdlib';
 import { onBeforeMount, onBeforeUpdate, onMounted, onUpdated, readonly, ref, type ComponentInternalInstance } from 'vue';
 import { useRenderCount } from '../useRenderCount';
-import { getLifeCycleTarger } from '../..';
+import { getLifeCycleTarger } from '@/utils';
 
 /**
  * @name useRenderInfo
- * @category Components
+ * @category Component
  * @description Returns information about the component's render count and the last time it was rendered
  * 
  * @param {ComponentInternalInstance} [instance] The component instance to track the render count for

web/vue/src/composables/index.ts

@@ -1,19 +1,8 @@
-export * from './tryOnBeforeMount';
+export * from './browser';
-export * from './tryOnMounted';
+export * from './component';
-export * from './tryOnScopeDispose';
+export * from './lifecycle';
-export * from './unrefElement';
+export * from './math';
-export * from './useAppSharedState';
+export * from './reactivity';
-export * from './useAsyncState';
+export * from './state';
-export * from './useCached';
+export * from './storage';
-export * from './useClamp';
+export * from './utilities';
-export * from './useContextFactory';
-export * from './useCounter';
-export * from './useFocusGuard';
-export * from './useInjectionStore';
-export * from './useLastChanged';
-export * from './useMounted';
-export * from './useOffsetPagination';
-export * from './useRenderCount';
-export * from './useRenderInfo';
-export * from './useSupported';
-export * from './useSyncRefs';

web/vue/src/composables/lifecycle/index.ts

@@ -0,0 +1,4 @@
+export * from './tryOnBeforeMount';
+export * from './tryOnMounted';
+export * from './tryOnScopeDispose';
+export * from './useMounted';

web/vue/src/composables/lifecycle/tryOnBeforeMount/index.ts

@@ -1,5 +1,5 @@
 import { onBeforeMount, nextTick, type ComponentInternalInstance } from 'vue';
-import { getLifeCycleTarger } from '../..';
+import { getLifeCycleTarger } from '@/utils';
 import type { VoidFunction } from '@robonen/stdlib';
 
 // TODO: test
@@ -11,7 +11,7 @@ export interface TryOnBeforeMountOptions {
 
 /**
  * @name tryOnBeforeMount
- * @category Components
+ * @category Lifecycle
  * @description Call onBeforeMount if it's inside a component lifecycle hook, otherwise just calls it
  * 
  * @param {VoidFunction} fn - The function to run on before mount.

web/vue/src/composables/lifecycle/tryOnMounted/index.ts

@@ -1,5 +1,5 @@
 import { onMounted, nextTick, type ComponentInternalInstance } from 'vue';
-import { getLifeCycleTarger } from '../..';
+import { getLifeCycleTarger } from '@/utils';
 import type { VoidFunction } from '@robonen/stdlib';
 
 // TODO: tests
@@ -11,7 +11,7 @@ export interface TryOnMountedOptions {
 
 /**
  * @name tryOnMounted
- * @category Components
+ * @category Lifecycle
  * @description Call onMounted if it's inside a component lifecycle hook, otherwise just calls it
  * 
  * @param {VoidFunction} fn The function to call

web/vue/src/composables/lifecycle/tryOnScopeDispose/index.ts

@@ -3,7 +3,7 @@ import { getCurrentScope, onScopeDispose } from 'vue';
 
 /**
  * @name tryOnScopeDispose
- * @category Components
+ * @category Lifecycle
  * @description A composable that will run a callback when the scope is disposed or do nothing if the scope isn't available.
  * 
  * @param {VoidFunction} callback - The callback to run when the scope is disposed.

web/vue/src/composables/lifecycle/useMounted/index.ts

@@ -1,9 +1,9 @@
 import { onMounted, readonly, ref, type ComponentInternalInstance } from 'vue';
-import { getLifeCycleTarger } from '../..';
+import { getLifeCycleTarger } from '@/utils';
 
 /**
  * @name useMounted
- * @category Components
+ * @category Lifecycle
  * @description Returns a ref that tracks the mounted state of the component (doesn't track the unmounted state)
  * 
  * @param {ComponentInternalInstance} [instance] The component instance to track the mounted state for

web/vue/src/composables/math/index.ts

@@ -0,0 +1 @@
+export * from './useClamp';

web/vue/src/composables/reactivity/broadcastedRef/index.ts

@@ -0,0 +1,41 @@
+import { customRef, onScopeDispose } from 'vue';
+
+/**
+ * @name broadcastedRef
+ * @category Reactivity
+ * @description Creates a custom ref that syncs its value across browser tabs via the BroadcastChannel API
+ *
+ * @param {string} key The channel key to use for broadcasting
+ * @param {T} initialValue The initial value of the ref
+ * @returns {Ref<T>} A custom ref that broadcasts value changes across tabs
+ *
+ * @example
+ * const count = broadcastedRef('counter', 0);
+ *
+ * @since 0.0.1
+ */
+export function broadcastedRef<T>(key: string, initialValue: T) {
+  const channel = new BroadcastChannel(key);
+
+  onScopeDispose(channel.close);
+
+  return customRef<T>((track, trigger) => {
+    channel.onmessage = (event) => {
+      track();
+      return event.data;
+    };
+
+    channel.postMessage(initialValue);
+
+    return {
+      get() {
+        return initialValue;
+      },
+      set(newValue: T) {
+        initialValue = newValue;
+        channel.postMessage(newValue);
+        trigger();
+      },
+    };
+  });
+}

web/vue/src/composables/reactivity/index.ts

@@ -0,0 +1,4 @@
+export * from './broadcastedRef';
+export * from './useCached';
+export * from './useLastChanged';
+export * from './useSyncRefs';

web/vue/src/composables/reactivity/useLastChanged/index.ts

@@ -10,7 +10,7 @@ export interface UseLastChangedOptions<
 
 /**
  * @name useLastChanged
- * @category State
+ * @category Reactivity
  * @description Records the last time a value changed
  * 
  * @param {WatchSource} source The value to track

web/vue/src/composables/state/index.ts

@@ -0,0 +1,6 @@
+export * from './useAppSharedState';
+export * from './useAsyncState';
+export * from './useContextFactory';
+export * from './useCounter';
+export * from './useInjectionStore';
+export * from './useToggle';

web/vue/src/composables/state/useContextFactory/index.test.ts

@@ -2,7 +2,7 @@ import { describe, it, expect } from 'vitest';
 import { defineComponent } from 'vue';
 import { useContextFactory } from '.';
 import { mount } from '@vue/test-utils';
-import { VueToolsError } from '../../utils';
+import { VueToolsError } from '@/utils';
 
 function testFactory<Data>(
   data: Data,

web/vue/src/composables/state/useContextFactory/index.ts

@@ -1,5 +1,5 @@
 import { inject as vueInject, provide as vueProvide, type InjectionKey, type App } from 'vue';
-import { VueToolsError } from '../..';
+import { VueToolsError } from '@/utils';
 
 /**
  * @name useContextFactory

web/vue/src/composables/state/useCounter/index.ts

@@ -17,7 +17,7 @@ export interface UseConterReturn {
 
 /**
  * @name useCounter
- * @category Utilities
+ * @category State
  * @description A composable that provides a counter with increment, decrement, set, get, and reset functions
  * 
  * @param {MaybeRef<number>} [initialValue=0] The initial value of the counter

web/vue/src/composables/state/useToggle/index.test.ts

@@ -0,0 +1,110 @@
+import { it, expect, describe } from 'vitest';
+import { ref } from 'vue';
+import { useToggle } from '.';
+
+describe('useToggle', () => {
+  it('initialize with false by default', () => {
+    const { value } = useToggle();
+    expect(value.value).toBe(false);
+  });
+
+  it('initialize with the provided initial value', () => {
+    const { value } = useToggle(true);
+    expect(value.value).toBe(true);
+  });
+
+  it('initialize with the provided initial value from a ref', () => {
+    const { value } = useToggle(ref(true));
+    expect(value.value).toBe(true);
+  });
+
+  it('toggle from false to true', () => {
+    const { value, toggle } = useToggle(false);
+    toggle();
+    expect(value.value).toBe(true);
+  });
+
+  it('toggle from true to false', () => {
+    const { value, toggle } = useToggle(true);
+    toggle();
+    expect(value.value).toBe(false);
+  });
+
+  it('toggle multiple times', () => {
+    const { value, toggle } = useToggle(false);
+    toggle();
+    expect(value.value).toBe(true);
+    toggle();
+    expect(value.value).toBe(false);
+    toggle();
+    expect(value.value).toBe(true);
+  });
+
+  it('toggle returns the new value', () => {
+    const { toggle } = useToggle(false);
+    expect(toggle()).toBe(true);
+    expect(toggle()).toBe(false);
+  });
+
+  it('set a specific value via toggle', () => {
+    const { value, toggle } = useToggle(false);
+    toggle(true);
+    expect(value.value).toBe(true);
+    toggle(true);
+    expect(value.value).toBe(true);
+  });
+
+  it('use custom truthy and falsy values', () => {
+    const { value, toggle } = useToggle('off', {
+      truthyValue: 'on',
+      falsyValue: 'off',
+    });
+
+    expect(value.value).toBe('off');
+    toggle();
+    expect(value.value).toBe('on');
+    toggle();
+    expect(value.value).toBe('off');
+  });
+
+  it('set a specific custom value via toggle', () => {
+    const { value, toggle } = useToggle('off', {
+      truthyValue: 'on',
+      falsyValue: 'off',
+    });
+
+    toggle('on');
+    expect(value.value).toBe('on');
+    toggle('on');
+    expect(value.value).toBe('on');
+  });
+
+  it('use ref-based truthy and falsy values', () => {
+    const truthy = ref('yes');
+    const falsy = ref('no');
+
+    const { value, toggle } = useToggle('no', {
+      truthyValue: truthy,
+      falsyValue: falsy,
+    });
+
+    expect(value.value).toBe('no');
+    toggle();
+    expect(value.value).toBe('yes');
+    toggle();
+    expect(value.value).toBe('no');
+  });
+
+  it('use getter-based truthy and falsy values', () => {
+    const { value, toggle } = useToggle(0, {
+      truthyValue: () => 1,
+      falsyValue: () => 0,
+    });
+
+    expect(value.value).toBe(0);
+    toggle();
+    expect(value.value).toBe(1);
+    toggle();
+    expect(value.value).toBe(0);
+  });
+});

web/vue/src/composables/state/useToggle/index.ts

@@ -1,19 +1,36 @@
-import { isRef, ref, toValue, type MaybeRefOrGetter, type MaybeRef, type Ref } from 'vue';
+import { ref, toValue, type MaybeRefOrGetter, type MaybeRef, type Ref } from 'vue';
 
 export interface UseToggleOptions<Truthy, Falsy> {
     truthyValue?: MaybeRefOrGetter<Truthy>,
     falsyValue?: MaybeRefOrGetter<Falsy>,
 }
 
-export function useToggle<Truthy = true, Falsy = false>(
+export interface UseToggleReturn<Truthy, Falsy> {
-    initialValue?: MaybeRef<Truthy | Falsy>,
+    value: Ref<Truthy | Falsy>;
-    options?: UseToggleOptions<Truthy, Falsy>,
+    toggle: (value?: Truthy | Falsy) => Truthy | Falsy;
-): { value: Ref<Truthy | Falsy>, toggle: (value?: Truthy | Falsy) => Truthy | Falsy };
+}
 
+/**
+ * @name useToggle
+ * @category State
+ * @description A composable that provides a boolean toggle with customizable truthy/falsy values
+ *
+ * @param {MaybeRef<Truthy | Falsy>} [initialValue=false] The initial value
+ * @param {UseToggleOptions<Truthy, Falsy>} [options={}] Options for custom truthy/falsy values
+ * @returns {UseToggleReturn<Truthy, Falsy>} The toggle state and function
+ *
+ * @example
+ * const { value, toggle } = useToggle();
+ *
+ * @example
+ * const { value, toggle } = useToggle(false, { truthyValue: 'on', falsyValue: 'off' });
+ *
+ * @since 0.0.1
+ */
 export function useToggle<Truthy = true, Falsy = false>(
     initialValue: MaybeRef<Truthy | Falsy> = false as Truthy | Falsy,
     options: UseToggleOptions<Truthy, Falsy> = {},
-) {
+): UseToggleReturn<Truthy, Falsy> {
     const {
         truthyValue = true as Truthy,
         falsyValue = false as Falsy,

web/vue/src/composables/storage/index.ts

@@ -0,0 +1,4 @@
+export * from './useLocalStorage';
+export * from './useSessionStorage';
+export * from './useStorage';
+export * from './useStorageAsync';

web/vue/src/composables/storage/useLocalStorage/index.test.ts

@@ -0,0 +1,72 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import { nextTick } from 'vue';
+import { useLocalStorage } from '.';
+
+describe('useLocalStorage', () => {
+  beforeEach(() => {
+    localStorage.clear();
+  });
+
+  it('stores and reads a string via localStorage', async () => {
+    const state = useLocalStorage<string>('ls-string', 'hello');
+
+    expect(state.value).toBe('hello');
+    expect(localStorage.getItem('ls-string')).toBe('hello');
+
+    state.value = 'world';
+    await nextTick();
+
+    expect(localStorage.getItem('ls-string')).toBe('world');
+  });
+
+  it('stores and reads a number', async () => {
+    const state = useLocalStorage<number>('ls-number', 42);
+
+    expect(state.value).toBe(42);
+
+    state.value = 100;
+    await nextTick();
+
+    expect(localStorage.getItem('ls-number')).toBe('100');
+  });
+
+  it('stores and reads an object', async () => {
+    const state = useLocalStorage('ls-obj', { a: 1 });
+
+    expect(state.value).toEqual({ a: 1 });
+
+    state.value = { a: 2 };
+    await nextTick();
+
+    expect(JSON.parse(localStorage.getItem('ls-obj')!)).toEqual({ a: 2 });
+  });
+
+  it('reads existing value from localStorage on init', () => {
+    localStorage.setItem('ls-existing', '"stored"');
+
+    const state = useLocalStorage('ls-existing', 'default', {
+      serializer: { read: (v) => JSON.parse(v), write: (v) => JSON.stringify(v) },
+    });
+
+    expect(state.value).toBe('stored');
+  });
+
+  it('removes from localStorage when set to null', async () => {
+    const state = useLocalStorage<string | null>('ls-null', 'value');
+    expect(localStorage.getItem('ls-null')).toBe('value');
+
+    state.value = null;
+    await nextTick();
+
+    expect(localStorage.getItem('ls-null')).toBeNull();
+  });
+
+  it('passes options through to useStorage', () => {
+    const state = useLocalStorage<string>('ls-no-write', 'default', {
+      writeDefaults: false,
+    });
+
+    expect(state.value).toBe('default');
+    expect(localStorage.getItem('ls-no-write')).toBeNull();
+  });
+});

web/vue/src/composables/storage/useLocalStorage/index.ts

@@ -0,0 +1,40 @@
+import type { MaybeRefOrGetter, Ref } from 'vue';
+import { defaultWindow } from '@/types';
+import { VueToolsError } from '@/utils/error';
+import { useStorage, type UseStorageOptions } from '../useStorage';
+
+/**
+ * @name useLocalStorage
+ * @category Storage
+ * @description Reactive localStorage binding — creates a ref synced with `window.localStorage`
+ *
+ * @param {string} key The storage key
+ * @param {MaybeRefOrGetter<T>} initialValue The initial/default value
+ * @param {UseStorageOptions<T>} [options={}] Options
+ * @returns {Ref<T>} A reactive ref synced with localStorage
+ *
+ * @example
+ * const count = useLocalStorage('my-count', 0);
+ *
+ * @example
+ * const state = useLocalStorage('my-state', { hello: 'world' });
+ *
+ * @since 0.0.12
+ */
+export function useLocalStorage<T extends string>(key: string, initialValue: MaybeRefOrGetter<T>, options?: UseStorageOptions<T>): Ref<T>;
+export function useLocalStorage<T extends number>(key: string, initialValue: MaybeRefOrGetter<T>, options?: UseStorageOptions<T>): Ref<T>;
+export function useLocalStorage<T extends boolean>(key: string, initialValue: MaybeRefOrGetter<T>, options?: UseStorageOptions<T>): Ref<T>;
+export function useLocalStorage<T>(key: string, initialValue: MaybeRefOrGetter<T>, options?: UseStorageOptions<T>): Ref<T>;
+export function useLocalStorage<T = unknown>(key: string, initialValue: MaybeRefOrGetter<null>, options?: UseStorageOptions<T>): Ref<T>;
+export function useLocalStorage<T>(
+  key: string,
+  initialValue: MaybeRefOrGetter<T>,
+  options: UseStorageOptions<T> = {},
+): Ref<T> {
+  const storage = defaultWindow?.localStorage;
+
+  if (!storage)
+    throw new VueToolsError('useLocalStorage: localStorage is not available');
+
+  return useStorage(key, initialValue, storage, options);
+}

web/vue/src/composables/storage/useSessionStorage/index.test.ts

@@ -0,0 +1,72 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import { nextTick } from 'vue';
+import { useSessionStorage } from '.';
+
+describe('useSessionStorage', () => {
+  beforeEach(() => {
+    sessionStorage.clear();
+  });
+
+  it('stores and reads a string via sessionStorage', async () => {
+    const state = useSessionStorage<string>('ss-string', 'hello');
+
+    expect(state.value).toBe('hello');
+    expect(sessionStorage.getItem('ss-string')).toBe('hello');
+
+    state.value = 'world';
+    await nextTick();
+
+    expect(sessionStorage.getItem('ss-string')).toBe('world');
+  });
+
+  it('stores and reads a number', async () => {
+    const state = useSessionStorage<number>('ss-number', 42);
+
+    expect(state.value).toBe(42);
+
+    state.value = 100;
+    await nextTick();
+
+    expect(sessionStorage.getItem('ss-number')).toBe('100');
+  });
+
+  it('stores and reads an object', async () => {
+    const state = useSessionStorage('ss-obj', { a: 1 });
+
+    expect(state.value).toEqual({ a: 1 });
+
+    state.value = { a: 2 };
+    await nextTick();
+
+    expect(JSON.parse(sessionStorage.getItem('ss-obj')!)).toEqual({ a: 2 });
+  });
+
+  it('reads existing value from sessionStorage on init', () => {
+    sessionStorage.setItem('ss-existing', '"stored"');
+
+    const state = useSessionStorage('ss-existing', 'default', {
+      serializer: { read: (v) => JSON.parse(v), write: (v) => JSON.stringify(v) },
+    });
+
+    expect(state.value).toBe('stored');
+  });
+
+  it('removes from sessionStorage when set to null', async () => {
+    const state = useSessionStorage<string | null>('ss-null', 'value');
+    expect(sessionStorage.getItem('ss-null')).toBe('value');
+
+    state.value = null;
+    await nextTick();
+
+    expect(sessionStorage.getItem('ss-null')).toBeNull();
+  });
+
+  it('passes options through to useStorage', () => {
+    const state = useSessionStorage<string>('ss-no-write', 'default', {
+      writeDefaults: false,
+    });
+
+    expect(state.value).toBe('default');
+    expect(sessionStorage.getItem('ss-no-write')).toBeNull();
+  });
+});

web/vue/src/composables/storage/useSessionStorage/index.ts

@@ -0,0 +1,40 @@
+import type { MaybeRefOrGetter, Ref } from 'vue';
+import { defaultWindow } from '@/types';
+import { VueToolsError } from '@/utils/error';
+import { useStorage, type UseStorageOptions } from '../useStorage';
+
+/**
+ * @name useSessionStorage
+ * @category Storage
+ * @description Reactive sessionStorage binding — creates a ref synced with `window.sessionStorage`
+ *
+ * @param {string} key The storage key
+ * @param {MaybeRefOrGetter<T>} initialValue The initial/default value
+ * @param {UseStorageOptions<T>} [options={}] Options
+ * @returns {Ref<T>} A reactive ref synced with sessionStorage
+ *
+ * @example
+ * const count = useSessionStorage('my-count', 0);
+ *
+ * @example
+ * const state = useSessionStorage('my-state', { hello: 'world' });
+ *
+ * @since 0.0.12
+ */
+export function useSessionStorage<T extends string>(key: string, initialValue: MaybeRefOrGetter<T>, options?: UseStorageOptions<T>): Ref<T>;
+export function useSessionStorage<T extends number>(key: string, initialValue: MaybeRefOrGetter<T>, options?: UseStorageOptions<T>): Ref<T>;
+export function useSessionStorage<T extends boolean>(key: string, initialValue: MaybeRefOrGetter<T>, options?: UseStorageOptions<T>): Ref<T>;
+export function useSessionStorage<T>(key: string, initialValue: MaybeRefOrGetter<T>, options?: UseStorageOptions<T>): Ref<T>;
+export function useSessionStorage<T = unknown>(key: string, initialValue: MaybeRefOrGetter<null>, options?: UseStorageOptions<T>): Ref<T>;
+export function useSessionStorage<T>(
+  key: string,
+  initialValue: MaybeRefOrGetter<T>,
+  options: UseStorageOptions<T> = {},
+): Ref<T> {
+  const storage = defaultWindow?.sessionStorage;
+
+  if (!storage)
+    throw new VueToolsError('useSessionStorage: sessionStorage is not available');
+
+  return useStorage(key, initialValue, storage, options);
+}

web/vue/src/composables/storage/useStorage/index.test.ts

@@ -0,0 +1,318 @@
+import { describe, it, expect, vi } from 'vitest';
+import { nextTick } from 'vue';
+import { useStorage, StorageSerializers, type StorageLike } from '.';
+
+function createMockStorage(): StorageLike & { store: Map<string, string> } {
+  const store = new Map<string, string>();
+
+  return {
+    store,
+    getItem: (key: string) => store.get(key) ?? null,
+    setItem: (key: string, value: string) => store.set(key, value),
+    removeItem: (key: string) => store.delete(key),
+  };
+}
+
+describe('useStorage', () => {
+  // --- Basic types ---
+
+  it('stores and reads a string', async () => {
+    const storage = createMockStorage();
+    const state = useStorage<string>('test-string', 'hello', storage);
+
+    expect(state.value).toBe('hello');
+    expect(storage.getItem('test-string')).toBe('hello');
+
+    state.value = 'world';
+    await nextTick();
+
+    expect(storage.getItem('test-string')).toBe('world');
+  });
+
+  it('stores and reads a number', async () => {
+    const storage = createMockStorage();
+    const state = useStorage<number>('test-number', 42, storage);
+
+    expect(state.value).toBe(42);
+
+    state.value = 100;
+    await nextTick();
+
+    expect(storage.getItem('test-number')).toBe('100');
+  });
+
+  it('stores and reads a boolean', async () => {
+    const storage = createMockStorage();
+    const state = useStorage<boolean>('test-bool', true, storage);
+
+    expect(state.value).toBe(true);
+
+    state.value = false;
+    await nextTick();
+
+    expect(storage.getItem('test-bool')).toBe('false');
+  });
+
+  it('stores and reads an object', async () => {
+    const storage = createMockStorage();
+    const state = useStorage('test-obj', { a: 1, b: 'two' }, storage);
+
+    expect(state.value).toEqual({ a: 1, b: 'two' });
+
+    state.value = { a: 2, b: 'three' };
+    await nextTick();
+
+    expect(JSON.parse(storage.getItem('test-obj')!)).toEqual({ a: 2, b: 'three' });
+  });
+
+  // --- Reads existing value from storage ---
+
+  it('reads existing value from storage on init', () => {
+    const storage = createMockStorage();
+    storage.store.set('existing', '"stored-value"');
+
+    const state = useStorage('existing', 'default', storage, {
+      serializer: StorageSerializers.object,
+    });
+
+    expect(state.value).toBe('stored-value');
+  });
+
+  // --- Removes item when set to null ---
+
+  it('removes from storage when value is set to null', async () => {
+    const storage = createMockStorage();
+    const state = useStorage<string | null>('test-null', 'value', storage);
+
+    await nextTick();
+    expect(storage.getItem('test-null')).toBe('value');
+
+    state.value = null;
+    await nextTick();
+
+    expect(storage.getItem('test-null')).toBeNull();
+  });
+
+  // --- Custom serializer ---
+
+  it('uses custom serializer', async () => {
+    const storage = createMockStorage();
+
+    const serializer = {
+      read: (v: string) => v.split(',').map(Number),
+      write: (v: number[]) => v.join(','),
+    };
+
+    const state = useStorage('custom-ser', [1, 2, 3], storage, { serializer });
+
+    expect(state.value).toEqual([1, 2, 3]);
+
+    state.value = [4, 5, 6];
+    await nextTick();
+
+    expect(storage.getItem('custom-ser')).toBe('4,5,6');
+  });
+
+  // --- Merge defaults ---
+
+  it('merges defaults with stored value', () => {
+    const storage = createMockStorage();
+    storage.store.set('merge-test', JSON.stringify({ hello: 'stored' }));
+
+    const state = useStorage(
+      'merge-test',
+      { hello: 'default', greeting: 'hi' },
+      storage,
+      { mergeDefaults: true },
+    );
+
+    expect(state.value.hello).toBe('stored');
+    expect(state.value.greeting).toBe('hi');
+  });
+
+  it('uses custom merge function', () => {
+    const storage = createMockStorage();
+    storage.store.set('merge-fn', JSON.stringify({ a: 1 }));
+
+    const state = useStorage(
+      'merge-fn',
+      { a: 0, b: 2 },
+      storage,
+      {
+        mergeDefaults: (stored, defaults) => ({ ...defaults, ...stored, b: stored.b ?? defaults.b }),
+      },
+    );
+
+    expect(state.value).toEqual({ a: 1, b: 2 });
+  });
+
+  // --- Map and Set ---
+
+  it('stores and reads a Map', async () => {
+    const storage = createMockStorage();
+    const initial = new Map([['key1', 'val1']]);
+    const state = useStorage('test-map', initial, storage);
+
+    expect(state.value).toEqual(new Map([['key1', 'val1']]));
+
+    state.value = new Map([['key2', 'val2']]);
+    await nextTick();
+
+    const raw = storage.getItem('test-map');
+    expect(JSON.parse(raw!)).toEqual([['key2', 'val2']]);
+  });
+
+  it('stores and reads a Set', async () => {
+    const storage = createMockStorage();
+    const initial = new Set([1, 2, 3]);
+    const state = useStorage('test-set', initial, storage);
+
+    expect(state.value).toEqual(new Set([1, 2, 3]));
+
+    state.value = new Set([4, 5]);
+    await nextTick();
+
+    const raw = storage.getItem('test-set');
+    expect(JSON.parse(raw!)).toEqual([4, 5]);
+  });
+
+  // --- Date ---
+
+  it('stores and reads a Date', async () => {
+    const storage = createMockStorage();
+    const date = new Date('2026-02-14T00:00:00.000Z');
+    const state = useStorage('test-date', date, storage);
+
+    expect(state.value).toEqual(date);
+
+    const newDate = new Date('2026-12-25T00:00:00.000Z');
+    state.value = newDate;
+    await nextTick();
+
+    expect(storage.getItem('test-date')).toBe(newDate.toISOString());
+  });
+
+  // --- Error handling ---
+
+  it('calls onError when read fails', () => {
+    const storage = createMockStorage();
+    storage.store.set('bad-json', '{invalid');
+    const onError = vi.fn();
+
+    const state = useStorage('bad-json', { fallback: true }, storage, { onError });
+
+    expect(onError).toHaveBeenCalledOnce();
+    expect(state.value).toEqual({ fallback: true });
+  });
+
+  it('calls onError when write fails', async () => {
+    const onError = vi.fn();
+    const storage: StorageLike = {
+      getItem: () => null,
+      setItem: () => { throw new Error('quota exceeded'); },
+      removeItem: () => {},
+    };
+
+    const state = useStorage<string>('fail-write', 'init', storage, { onError });
+
+    // One error from initial persist of defaults
+    expect(onError).toHaveBeenCalledOnce();
+
+    state.value = 'new';
+    await nextTick();
+
+    // Another error from the write triggered by value change
+    expect(onError).toHaveBeenCalledTimes(2);
+  });
+
+  // --- Persists defaults on init ---
+
+  it('persists default value to storage on init when key does not exist', () => {
+    const storage = createMockStorage();
+    useStorage('new-key', 'default-val', storage);
+
+    expect(storage.getItem('new-key')).toBe('default-val');
+  });
+
+  it('does not overwrite existing storage value with defaults', () => {
+    const storage = createMockStorage();
+    storage.store.set('existing-key', 'existing-val');
+
+    useStorage('existing-key', 'default-val', storage);
+
+    expect(storage.getItem('existing-key')).toBe('existing-val');
+  });
+
+  // --- writeDefaults: false ---
+
+  it('does not persist defaults when writeDefaults is false', () => {
+    const storage = createMockStorage();
+    useStorage('no-write', 'default-val', storage, { writeDefaults: false });
+
+    expect(storage.getItem('no-write')).toBeNull();
+  });
+
+  // --- No infinite loop on init ---
+
+  it('calls setItem exactly once on init for writeDefaults', () => {
+    const setItem = vi.fn();
+    const storage: StorageLike = {
+      getItem: () => null,
+      setItem,
+      removeItem: vi.fn(),
+    };
+
+    useStorage<string>('init-key', 'value', storage);
+
+    expect(setItem).toHaveBeenCalledOnce();
+    expect(setItem).toHaveBeenCalledWith('init-key', 'value');
+  });
+
+  // --- No-op write when value unchanged ---
+
+  it('does not call setItem when value is unchanged', async () => {
+    const storage = createMockStorage();
+    const state = useStorage<string>('noop-key', 'same', storage);
+
+    const setItem = vi.spyOn(storage, 'setItem');
+    setItem.mockClear();
+
+    // Re-assign the same value
+    state.value = 'same';
+    await nextTick();
+
+    expect(setItem).not.toHaveBeenCalled();
+  });
+
+  // --- shallow: false with deep mutation ---
+
+  it('writes to storage on deep object mutation with shallow: false', async () => {
+    const storage = createMockStorage();
+    const state = useStorage('deep-obj', { nested: { count: 0 } }, storage, { shallow: false });
+
+    expect(state.value.nested.count).toBe(0);
+
+    state.value.nested.count = 42;
+    await nextTick();
+
+    expect(JSON.parse(storage.getItem('deep-obj')!)).toEqual({ nested: { count: 42 } });
+  });
+
+  // --- Multiple rapid assignments ---
+
+  it('only writes last value when multiple assignments happen before flush', async () => {
+    const storage = createMockStorage();
+    const state = useStorage<string>('rapid-key', 'initial', storage);
+
+    const setItem = vi.spyOn(storage, 'setItem');
+    setItem.mockClear();
+
+    state.value = 'first';
+    state.value = 'second';
+    state.value = 'third';
+    await nextTick();
+
+    // Watcher fires once with the last value (pre flush batches)
+    expect(storage.getItem('rapid-key')).toBe('third');
+  });
+});

web/vue/src/composables/storage/useStorage/index.ts

@@ -0,0 +1,223 @@
+import { ref, shallowRef, watch, toValue, type Ref, type MaybeRefOrGetter } from 'vue';
+import { isBoolean, isNumber, isString, isObject, isMap, isSet, isDate } from '@robonen/stdlib';
+import type { ConfigurableFlush } from '@/types';
+
+export interface StorageSerializer<T> {
+  read: (raw: string) => T;
+  write: (value: T) => string;
+}
+
+export const StorageSerializers: { [K: string]: StorageSerializer<any> } & {
+  boolean: StorageSerializer<boolean>;
+  number: StorageSerializer<number>;
+  string: StorageSerializer<string>;
+  object: StorageSerializer<any>;
+  map: StorageSerializer<Map<any, any>>;
+  set: StorageSerializer<Set<any>>;
+  date: StorageSerializer<Date>;
+} = {
+  boolean: {
+    read: (v: string) => v === 'true',
+    write: (v: boolean) => String(v),
+  },
+  number: {
+    read: (v: string) => Number.parseFloat(v),
+    write: (v: number) => String(v),
+  },
+  string: {
+    read: (v: string) => v,
+    write: (v: string) => v,
+  },
+  object: {
+    read: (v: string) => JSON.parse(v),
+    write: (v: any) => JSON.stringify(v),
+  },
+  map: {
+    read: (v: string) => new Map(JSON.parse(v)),
+    write: (v: Map<any, any>) => JSON.stringify([...v.entries()]),
+  },
+  set: {
+    read: (v: string) => new Set(JSON.parse(v)),
+    write: (v: Set<any>) => JSON.stringify([...v]),
+  },
+  date: {
+    read: (v: string) => new Date(v),
+    write: (v: Date) => v.toISOString(),
+  },
+};
+
+export interface StorageLike {
+  getItem: (key: string) => string | null;
+  setItem: (key: string, value: string) => void;
+  removeItem: (key: string) => void;
+}
+
+export interface UseStorageOptions<T> extends ConfigurableFlush {
+  /**
+   * Use shallowRef instead of ref for the internal state
+   * @default true
+   */
+  shallow?: boolean;
+  /**
+   * Watch for deep changes
+   * @default true
+   */
+  deep?: boolean;
+  /**
+   * Write the default value to the storage when it does not exist
+   * @default true
+   */
+  writeDefaults?: boolean;
+  /**
+   * Custom serializer for reading/writing storage values
+   */
+  serializer?: StorageSerializer<T>;
+  /**
+   * Merge the default value with the stored value
+   * @default false
+   */
+  mergeDefaults?: boolean | ((stored: T, defaults: T) => T);
+  /**
+   * Error handler for read/write failures
+   */
+  onError?: (error: unknown) => void;
+}
+
+export type UseStorageReturn<T> = Ref<T>;
+
+export function guessSerializer<T>(value: T): StorageSerializer<T> {
+  if (isBoolean(value)) return StorageSerializers.boolean as any;
+  if (isNumber(value)) return StorageSerializers.number as any;
+  if (isString(value)) return StorageSerializers.string as any;
+  if (isMap(value)) return StorageSerializers.map as any;
+  if (isSet(value)) return StorageSerializers.set as any;
+  if (isDate(value)) return StorageSerializers.date as any;
+  if (isObject(value)) return StorageSerializers.object as any;
+
+  return StorageSerializers.object as any;
+}
+
+export function shallowMerge<T>(stored: T, defaults: T): T {
+  if (isObject(stored) && isObject(defaults))
+    return { ...defaults, ...stored };
+
+  return stored;
+}
+
+/**
+ * @name useStorage
+ * @category Storage
+ * @description Reactive Storage binding — creates a ref synced with a storage backend
+ *
+ * @param {string} key The storage key
+ * @param {MaybeRefOrGetter<T>} initialValue The initial/default value
+ * @param {StorageLike} storage The storage backend
+ * @param {UseStorageOptions<T>} [options={}] Options
+ * @returns {Ref<T>} A reactive ref synced with storage
+ *
+ * @example
+ * const count = useStorage('my-count', 0, storage);
+ *
+ * @example
+ * const state = useStorage('my-state', { hello: 'world' }, storage);
+ *
+ * @example
+ * const id = useStorage('my-id', 'default', storage, {
+ *   serializer: { read: (v) => v, write: (v) => v },
+ * });
+ *
+ * @since 0.0.12
+ */
+export function useStorage<T extends string>(key: string, initialValue: MaybeRefOrGetter<T>, storage: StorageLike, options?: UseStorageOptions<T>): Ref<T>;
+export function useStorage<T extends number>(key: string, initialValue: MaybeRefOrGetter<T>, storage: StorageLike, options?: UseStorageOptions<T>): Ref<T>;
+export function useStorage<T extends boolean>(key: string, initialValue: MaybeRefOrGetter<T>, storage: StorageLike, options?: UseStorageOptions<T>): Ref<T>;
+export function useStorage<T>(key: string, initialValue: MaybeRefOrGetter<T>, storage: StorageLike, options?: UseStorageOptions<T>): Ref<T>;
+export function useStorage<T = unknown>(key: string, initialValue: MaybeRefOrGetter<null>, storage: StorageLike, options?: UseStorageOptions<T>): Ref<T>;
+export function useStorage<T>(
+  key: string,
+  initialValue: MaybeRefOrGetter<T>,
+  storage: StorageLike,
+  options: UseStorageOptions<T> = {},
+): Ref<T> {
+  const {
+    shallow = true,
+    deep = true,
+    flush = 'pre',
+    writeDefaults = true,
+    mergeDefaults = false,
+    onError = console.error,
+  } = options;
+
+  const defaults = toValue(initialValue);
+  const serializer = options.serializer ?? guessSerializer(defaults);
+
+  const data = (shallow ? shallowRef : ref)(defaults) as Ref<T>;
+
+  function read(): T {
+    const raw = storage.getItem(key);
+
+    if (raw == null) {
+      if (writeDefaults && defaults != null) {
+        try {
+          storage.setItem(key, serializer.write(defaults));
+        } catch (e) {
+          onError(e);
+        }
+      }
+
+      return defaults;
+    }
+
+    try {
+      let value = serializer.read(raw);
+
+      if (mergeDefaults) {
+        value = typeof mergeDefaults === 'function'
+          ? mergeDefaults(value, defaults)
+          : shallowMerge(value, defaults);
+      }
+
+      return value;
+    } catch (e) {
+      onError(e);
+      return defaults;
+    }
+  }
+
+  function write(value: T) {
+    try {
+      const oldValue = storage.getItem(key);
+
+      if (value == null) {
+        storage.removeItem(key);
+      } else {
+        const serialized = serializer.write(value);
+
+        if (oldValue !== serialized)
+          storage.setItem(key, serialized);
+      }
+    } catch (e) {
+      onError(e);
+    }
+  }
+
+  function update() {
+    pauseWatch();
+
+    try {
+      data.value = read();
+    } catch (e) {
+      onError(e);
+    } finally {
+      resumeWatch();
+    }
+  }
+
+  const { pause: pauseWatch, resume: resumeWatch } = watch(data, (newValue) => {
+    write(newValue);
+  }, { flush, deep });
+
+  update();
+
+  return data;
+}

web/vue/src/composables/storage/useStorageAsync/index.test.ts

@@ -0,0 +1,335 @@
+import { describe, it, expect, vi } from 'vitest';
+import { nextTick } from 'vue';
+import { useStorageAsync, type StorageLikeAsync } from '.';
+
+function createMockAsyncStorage(): StorageLikeAsync & { store: Map<string, string> } {
+  const store = new Map<string, string>();
+
+  return {
+    store,
+    getItem: async (key: string) => store.get(key) ?? null,
+    setItem: async (key: string, value: string) => { store.set(key, value); },
+    removeItem: async (key: string) => { store.delete(key); },
+  };
+}
+
+function createDelayedAsyncStorage(delay: number): StorageLikeAsync & { store: Map<string, string> } {
+  const store = new Map<string, string>();
+
+  return {
+    store,
+    getItem: (key: string) => new Promise((resolve) => setTimeout(() => resolve(store.get(key) ?? null), delay)),
+    setItem: (key: string, value: string) => new Promise((resolve) => setTimeout(() => { store.set(key, value); resolve(); }, delay)),
+    removeItem: (key: string) => new Promise((resolve) => setTimeout(() => { store.delete(key); resolve(); }, delay)),
+  };
+}
+
+describe('useStorageAsync', () => {
+  // --- Basic read/write ---
+
+  it('returns default value before storage is ready', () => {
+    const storage = createMockAsyncStorage();
+    const { state, isReady } = useStorageAsync('key', 'default', storage);
+
+    expect(state.value).toBe('default');
+    expect(isReady.value).toBe(false);
+  });
+
+  it('reads existing value from async storage', async () => {
+    const storage = createMockAsyncStorage();
+    storage.store.set('key', 'stored');
+
+    const { state, isReady } = await useStorageAsync('key', 'default', storage);
+
+    expect(state.value).toBe('stored');
+    expect(isReady.value).toBe(true);
+  });
+
+  it('writes value to async storage on change', async () => {
+    const storage = createMockAsyncStorage();
+    const { state } = await useStorageAsync<string>('key', 'initial', storage);
+
+    state.value = 'updated';
+    await nextTick();
+
+    // Allow async write to complete
+    await new Promise((resolve) => setTimeout(resolve, 0));
+
+    expect(storage.store.get('key')).toBe('updated');
+  });
+
+  // --- Types ---
+
+  it('reads and writes a number', async () => {
+    const storage = createMockAsyncStorage();
+    storage.store.set('num', '42');
+
+    const { state } = await useStorageAsync<number>('num', 0, storage);
+
+    expect(state.value).toBe(42);
+
+    state.value = 100;
+    await nextTick();
+    await new Promise((resolve) => setTimeout(resolve, 0));
+
+    expect(storage.store.get('num')).toBe('100');
+  });
+
+  it('reads and writes a boolean', async () => {
+    const storage = createMockAsyncStorage();
+    storage.store.set('flag', 'true');
+
+    const { state } = await useStorageAsync('flag', false, storage);
+
+    expect(state.value).toBe(true);
+
+    state.value = false;
+    await nextTick();
+    await new Promise((resolve) => setTimeout(resolve, 0));
+
+    expect(storage.store.get('flag')).toBe('false');
+  });
+
+  it('reads and writes an object', async () => {
+    const storage = createMockAsyncStorage();
+    storage.store.set('obj', JSON.stringify({ a: 1 }));
+
+    const { state } = await useStorageAsync('obj', { a: 0, b: 2 }, storage);
+
+    expect(state.value).toEqual({ a: 1 });
+  });
+
+  // --- Awaitable ---
+
+  it('is awaitable and resolves after initial read', async () => {
+    const storage = createDelayedAsyncStorage(50);
+    storage.store.set('delayed', 'loaded');
+
+    const { state, isReady } = await useStorageAsync('delayed', 'default', storage);
+
+    expect(state.value).toBe('loaded');
+    expect(isReady.value).toBe(true);
+  });
+
+  // --- onReady callback ---
+
+  it('calls onReady callback after initial load', async () => {
+    const storage = createMockAsyncStorage();
+    storage.store.set('ready', 'ready-value');
+
+    const onReady = vi.fn();
+
+    await useStorageAsync('ready', 'default', storage, { onReady });
+
+    expect(onReady).toHaveBeenCalledOnce();
+    expect(onReady).toHaveBeenCalledWith('ready-value');
+  });
+
+  it('calls onReady with default when key not in storage', async () => {
+    const storage = createMockAsyncStorage();
+    const onReady = vi.fn();
+
+    await useStorageAsync('missing', 'fallback', storage, { onReady });
+
+    expect(onReady).toHaveBeenCalledWith('fallback');
+  });
+
+  // --- Merge defaults ---
+
+  it('merges defaults with stored value', async () => {
+    const storage = createMockAsyncStorage();
+    storage.store.set('merge', JSON.stringify({ hello: 'stored' }));
+
+    const { state } = await useStorageAsync(
+      'merge',
+      { hello: 'default', greeting: 'hi' },
+      storage,
+      { mergeDefaults: true },
+    );
+
+    expect(state.value.hello).toBe('stored');
+    expect(state.value.greeting).toBe('hi');
+  });
+
+  it('uses custom merge function', async () => {
+    const storage = createMockAsyncStorage();
+    storage.store.set('merge-fn', JSON.stringify({ a: 1 }));
+
+    const { state } = await useStorageAsync(
+      'merge-fn',
+      { a: 0, b: 2 },
+      storage,
+      {
+        mergeDefaults: (stored, defaults) => ({ ...defaults, ...stored, b: stored.b ?? defaults.b }),
+      },
+    );
+
+    expect(state.value).toEqual({ a: 1, b: 2 });
+  });
+
+  // --- Custom serializer ---
+
+  it('uses custom async serializer', async () => {
+    const storage = createMockAsyncStorage();
+    storage.store.set('custom', '1,2,3');
+
+    const serializer = {
+      read: async (v: string) => v.split(',').map(Number),
+      write: async (v: number[]) => v.join(','),
+    };
+
+    const { state } = await useStorageAsync('custom', [0], storage, { serializer });
+
+    expect(state.value).toEqual([1, 2, 3]);
+
+    state.value = [4, 5, 6];
+    await nextTick();
+    await new Promise((resolve) => setTimeout(resolve, 0));
+
+    expect(storage.store.get('custom')).toBe('4,5,6');
+  });
+
+  // --- Null / remove ---
+
+  it('removes from storage when value is set to null', async () => {
+    const storage = createMockAsyncStorage();
+    storage.store.set('nullable', 'exists');
+
+    const { state } = await useStorageAsync<string | null>('nullable', 'default', storage);
+
+    state.value = null;
+    await nextTick();
+    await new Promise((resolve) => setTimeout(resolve, 0));
+
+    expect(storage.store.has('nullable')).toBe(false);
+  });
+
+  // --- Error handling ---
+
+  it('calls onError when read fails', async () => {
+    const onError = vi.fn();
+    const storage: StorageLikeAsync = {
+      getItem: async () => { throw new Error('read failure'); },
+      setItem: async () => {},
+      removeItem: async () => {},
+    };
+
+    const { state } = await useStorageAsync('fail-read', 'fallback', storage, { onError });
+
+    expect(onError).toHaveBeenCalledOnce();
+    expect(state.value).toBe('fallback');
+  });
+
+  it('calls onError when write fails', async () => {
+    const onError = vi.fn();
+    const storage: StorageLikeAsync = {
+      getItem: async () => null,
+      setItem: async () => { throw new Error('write failure'); },
+      removeItem: async () => {},
+    };
+
+    const { state } = await useStorageAsync<string>('fail-write', 'initial', storage, { onError });
+
+    // One error from writeDefaults persisting initial value
+    expect(onError).toHaveBeenCalledOnce();
+
+    state.value = 'new';
+    await nextTick();
+    await new Promise((resolve) => setTimeout(resolve, 0));
+
+    // Another error from the write triggered by value change
+    expect(onError).toHaveBeenCalledTimes(2);
+  });
+
+  // --- No unnecessary write-back on initial read ---
+
+  it('does not write back to storage after initial read', async () => {
+    const setItem = vi.fn(async () => {});
+    const storage: StorageLikeAsync = {
+      getItem: async () => 'existing',
+      setItem,
+      removeItem: async () => {},
+    };
+
+    await useStorageAsync('key', 'default', storage);
+    await nextTick();
+    await new Promise((resolve) => setTimeout(resolve, 0));
+
+    expect(setItem).not.toHaveBeenCalled();
+  });
+
+  it('does not write back to storage when key is missing and writeDefaults is false', async () => {
+    const setItem = vi.fn(async () => {});
+    const storage: StorageLikeAsync = {
+      getItem: async () => null,
+      setItem,
+      removeItem: async () => {},
+    };
+
+    await useStorageAsync('key', 'default', storage, { writeDefaults: false });
+    await nextTick();
+    await new Promise((resolve) => setTimeout(resolve, 0));
+
+    expect(setItem).not.toHaveBeenCalled();
+  });
+
+  // --- shallow: false with deep mutation ---
+
+  it('writes to storage on deep object mutation with shallow: false', async () => {
+    const storage = createMockAsyncStorage();
+    const { state } = await useStorageAsync(
+      'deep-obj',
+      { nested: { count: 0 } },
+      storage,
+      { shallow: false },
+    );
+
+    state.value.nested.count = 42;
+    await nextTick();
+    await new Promise((resolve) => setTimeout(resolve, 0));
+
+    expect(JSON.parse(storage.store.get('deep-obj')!)).toEqual({ nested: { count: 42 } });
+  });
+
+  // --- Multiple rapid assignments ---
+
+  it('handles multiple rapid assignments', async () => {
+    const storage = createMockAsyncStorage();
+    const { state } = await useStorageAsync<string>('rapid', 'initial', storage);
+
+    state.value = 'first';
+    state.value = 'second';
+    state.value = 'third';
+    await nextTick();
+    await new Promise((resolve) => setTimeout(resolve, 0));
+
+    expect(storage.store.get('rapid')).toBe('third');
+  });
+
+  // --- writeDefaults ---
+
+  it('persists defaults to storage when key does not exist', async () => {
+    const storage = createMockAsyncStorage();
+
+    await useStorageAsync('new-key', 'default-val', storage);
+
+    expect(storage.store.get('new-key')).toBe('default-val');
+  });
+
+  it('does not persist defaults when writeDefaults is false', async () => {
+    const storage = createMockAsyncStorage();
+
+    await useStorageAsync('new-key', 'default-val', storage, { writeDefaults: false });
+
+    expect(storage.store.has('new-key')).toBe(false);
+  });
+
+  it('does not overwrite existing value with defaults', async () => {
+    const storage = createMockAsyncStorage();
+    storage.store.set('existing', 'stored');
+
+    await useStorageAsync('existing', 'default', storage);
+
+    expect(storage.store.get('existing')).toBe('stored');
+  });
+});

web/vue/src/composables/storage/useStorageAsync/index.ts

@@ -0,0 +1,186 @@
+import { ref, shallowRef, watch, toValue, type Ref, type ShallowRef, type MaybeRefOrGetter, type UnwrapRef } from 'vue';
+import type { ConfigurableFlush } from '@/types';
+import { tryOnScopeDispose } from '@/composables/lifecycle/tryOnScopeDispose';
+import { guessSerializer, shallowMerge } from '../useStorage';
+
+export interface StorageSerializerAsync<T> {
+  read: (raw: string) => T | Promise<T>;
+  write: (value: T) => string | Promise<string>;
+}
+
+export interface StorageLikeAsync {
+  getItem: (key: string) => string | null | Promise<string | null>;
+  setItem: (key: string, value: string) => void | Promise<void>;
+  removeItem: (key: string) => void | Promise<void>;
+}
+
+export interface UseStorageAsyncOptions<T, Shallow extends boolean = true> extends ConfigurableFlush {
+  /**
+   * Use shallowRef instead of ref for the internal state
+   * @default true
+   */
+  shallow?: Shallow;
+  /**
+   * Watch for deep changes
+   * @default true
+   */
+  deep?: boolean;
+  /**
+   * Write the default value to the storage when it does not exist
+   * @default true
+   */
+  writeDefaults?: boolean;
+  /**
+   * Custom serializer for reading/writing storage values
+   */
+  serializer?: StorageSerializerAsync<T>;
+  /**
+   * Merge the default value with the stored value
+   * @default false
+   */
+  mergeDefaults?: boolean | ((stored: T, defaults: T) => T);
+  /**
+   * Called once when the initial value has been loaded from storage
+   */
+  onReady?: (value: T) => void;
+  /**
+   * Error handler for read/write failures
+   */
+  onError?: (error: unknown) => void;
+}
+
+export interface UseStorageAsyncReturnBase<T, Shallow extends boolean> {
+  state: Shallow extends true ? ShallowRef<T> : Ref<UnwrapRef<T>>;
+  isReady: Ref<boolean>;
+}
+
+export type UseStorageAsyncReturn<T, Shallow extends boolean> =
+  & UseStorageAsyncReturnBase<T, Shallow>
+  & PromiseLike<UseStorageAsyncReturnBase<T, Shallow>>;
+
+/**
+ * @name useStorageAsync
+ * @category Storage
+ * @description Reactive Storage binding with async support — creates a ref synced with an async storage backend
+ *
+ * @param {string} key The storage key
+ * @param {MaybeRefOrGetter<T>} initialValue The initial/default value
+ * @param {StorageLikeAsync} storage The async storage backend
+ * @param {UseStorageAsyncOptions<T>} [options={}] Options
+ * @returns {UseStorageAsyncReturn<T, Shallow>} An object with state ref and isReady flag, also awaitable
+ *
+ * @example
+ * const { state } = useStorageAsync('access-token', '', asyncStorage);
+ *
+ * @example
+ * const { state, isReady } = await useStorageAsync('settings', { theme: 'dark' }, asyncStorage);
+ *
+ * @example
+ * const { state } = useStorageAsync('key', 'default', asyncStorage, {
+ *   onReady: (value) => console.log('Loaded:', value),
+ * });
+ *
+ * @since 0.0.12
+ */
+export function useStorageAsync<T extends string, Shallow extends boolean = true>(key: string, initialValue: MaybeRefOrGetter<T>, storage: StorageLikeAsync, options?: UseStorageAsyncOptions<T, Shallow>): UseStorageAsyncReturn<T, Shallow>;
+export function useStorageAsync<T extends number, Shallow extends boolean = true>(key: string, initialValue: MaybeRefOrGetter<T>, storage: StorageLikeAsync, options?: UseStorageAsyncOptions<T, Shallow>): UseStorageAsyncReturn<T, Shallow>;
+export function useStorageAsync<T extends boolean, Shallow extends boolean = true>(key: string, initialValue: MaybeRefOrGetter<T>, storage: StorageLikeAsync, options?: UseStorageAsyncOptions<T, Shallow>): UseStorageAsyncReturn<T, Shallow>;
+export function useStorageAsync<T, Shallow extends boolean = true>(key: string, initialValue: MaybeRefOrGetter<T>, storage: StorageLikeAsync, options?: UseStorageAsyncOptions<T, Shallow>): UseStorageAsyncReturn<T, Shallow>;
+export function useStorageAsync<T = unknown, Shallow extends boolean = true>(key: string, initialValue: MaybeRefOrGetter<null>, storage: StorageLikeAsync, options?: UseStorageAsyncOptions<T, Shallow>): UseStorageAsyncReturn<T, Shallow>;
+export function useStorageAsync<T, Shallow extends boolean = true>(
+  key: string,
+  initialValue: MaybeRefOrGetter<T>,
+  storage: StorageLikeAsync,
+  options: UseStorageAsyncOptions<T, Shallow> = {},
+): UseStorageAsyncReturn<T, Shallow> {
+  const {
+    shallow = true,
+    deep = true,
+    flush = 'pre',
+    writeDefaults = true,
+    mergeDefaults = false,
+    onReady,
+    onError = console.error,
+  } = options;
+
+  const defaults = toValue(initialValue);
+  const serializer = options.serializer ?? guessSerializer(defaults);
+
+  const state = (shallow ? shallowRef : ref)(defaults) as Shallow extends true ? ShallowRef<T> : Ref<UnwrapRef<T>>;
+  const isReady = ref(false);
+
+  async function read(): Promise<T> {
+    try {
+      const raw = await storage.getItem(key);
+
+      if (raw == null) {
+        if (writeDefaults && defaults != null) {
+          try {
+            await storage.setItem(key, await serializer.write(defaults));
+          } catch (e) {
+            onError(e);
+          }
+        }
+
+        return defaults;
+      }
+
+      let value: T = await serializer.read(raw) as T;
+
+      if (mergeDefaults) {
+        value = typeof mergeDefaults === 'function'
+          ? mergeDefaults(value, defaults)
+          : shallowMerge(value, defaults);
+      }
+
+      return value;
+    } catch (e) {
+      onError(e);
+      return defaults;
+    }
+  }
+
+  async function write(value: T) {
+    try {
+      if (value == null) {
+        await storage.removeItem(key);
+      } else {
+        const raw = await serializer.write(value);
+        await storage.setItem(key, raw);
+      }
+    } catch (e) {
+      onError(e);
+    }
+  }
+
+  let stopWatch: (() => void) | null = null;
+
+  tryOnScopeDispose(() => stopWatch?.());
+
+  const shell: UseStorageAsyncReturnBase<T, Shallow> = {
+    state,
+    isReady,
+  };
+
+  const readyPromise: Promise<UseStorageAsyncReturnBase<T, Shallow>> = read().then((value) => {
+    (state as Ref).value = value;
+    isReady.value = true;
+    onReady?.(value);
+
+    // Set up watcher AFTER initial state is set — avoids write-back on init
+    const stop = watch(state, (newValue) => {
+      write(newValue as T);
+    }, { flush, deep });
+
+    stopWatch = stop;
+
+    return shell;
+  });
+
+  return {
+    ...shell,
+    then(onFulfilled, onRejected) {
+      return readyPromise.then(onFulfilled, onRejected);
+    },
+  };
+}

web/vue/src/composables/utilities/index.ts

@@ -0,0 +1 @@
+export * from './useOffsetPagination';

web/vue/src/composables/utilities/useOffsetPagination/index.ts

@@ -1,6 +1,6 @@
 import type { VoidFunction } from '@robonen/stdlib';
 import { computed, reactive, toValue, watch, type ComputedRef, type MaybeRef, type MaybeRefOrGetter, type UnwrapNestedRefs, type WritableComputedRef } from 'vue';
-import { useClamp } from '../useClamp';
+import { useClamp } from '@/composables/math/useClamp';
 
 // TODO: sync returned refs with passed refs
 

web/vue/src/types/flush.ts

@@ -0,0 +1,10 @@
+import type { WatchOptions } from 'vue';
+
+export interface ConfigurableFlush {
+  /**
+   * Timing for the watcher flush
+   *
+   * @default 'pre'
+   */
+  flush?: WatchOptions['flush'];
+}

web/vue/src/types/index.ts

@@ -1,2 +1,3 @@
+export * from './flush';
 export * from './resumable';
 export * from './window';

web/vue/src/types/window.ts

@@ -1,3 +1,12 @@
 import { isClient } from '@robonen/platform/multi';
 
-export const defaultWindow = /* #__PURE__ */ isClient ? window : undefined
+export const defaultWindow = /* #__PURE__ */ isClient ? window : undefined
+
+export interface ConfigurableWindow {
+  /**
+   * Specify a custom `window` instance, e.g. working with iframes or testing environments
+   *
+   * @default defaultWindow
+   */
+  window?: Window;
+}

web/vue/tsconfig.json

@@ -1,6 +1,13 @@
 {
   "extends": "@robonen/tsconfig/tsconfig.json",
   "compilerOptions": {
-    "lib": ["DOM"]
+    "lib": ["DOM"],
+    "baseUrl": ".",
+    "paths": {
+      "@/*": ["src/*"],
+      "@/composables/*": ["src/composables/*"],
+      "@/types": ["src/types"],
+      "@/utils": ["src/utils"]
+    }
   }
 }

web/vue/vitest.config.ts

@@ -0,0 +1,13 @@
+import { defineConfig } from 'vitest/config';
+import { resolve } from 'path';
+
+export default defineConfig({
+  resolve: {
+    alias: {
+      '@': resolve(__dirname, './src'),
+    },
+  },
+  test: {
+    environment: 'jsdom',
+  },
+});