/
index.ts
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/
index.ts
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import { nextTick, ref, shallowRef } from 'vue-demi'
import type { Awaitable, ConfigurableEventFilter, ConfigurableFlush, MaybeComputedRef, RemovableRef } from '@vueuse/shared'
import { isFunction, pausableWatch, resolveUnref } from '@vueuse/shared'
import type { StorageLike } from '../ssr-handlers'
import { getSSRHandler } from '../ssr-handlers'
import { useEventListener } from '../useEventListener'
import type { ConfigurableWindow } from '../_configurable'
import { defaultWindow } from '../_configurable'
import { guessSerializerType } from './guess'
export interface Serializer<T> {
read(raw: string): T
write(value: T): string
}
export interface SerializerAsync<T> {
read(raw: string): Awaitable<T>
write(value: T): Awaitable<string>
}
export const StorageSerializers: Record<'boolean' | 'object' | 'number' | 'any' | 'string' | 'map' | 'set' | 'date', Serializer<any>> = {
boolean: {
read: (v: any) => v === 'true',
write: (v: any) => String(v),
},
object: {
read: (v: any) => JSON.parse(v),
write: (v: any) => JSON.stringify(v),
},
number: {
read: (v: any) => Number.parseFloat(v),
write: (v: any) => String(v),
},
any: {
read: (v: any) => v,
write: (v: any) => String(v),
},
string: {
read: (v: any) => v,
write: (v: any) => String(v),
},
map: {
read: (v: any) => new Map(JSON.parse(v)),
write: (v: any) => JSON.stringify(Array.from((v as Map<any, any>).entries())),
},
set: {
read: (v: any) => new Set(JSON.parse(v)),
write: (v: any) => JSON.stringify(Array.from(v as Set<any>)),
},
date: {
read: (v: any) => new Date(v),
write: (v: any) => v.toISOString(),
},
}
export const customStorageEventName = 'vueuse-storage'
export interface StorageEventLike {
storageArea: StorageLike | null
key: StorageEvent['key']
oldValue: StorageEvent['oldValue']
newValue: StorageEvent['newValue']
}
export interface UseStorageOptions<T> extends ConfigurableEventFilter, ConfigurableWindow, ConfigurableFlush {
/**
* Watch for deep changes
*
* @default true
*/
deep?: boolean
/**
* Listen to storage changes, useful for multiple tabs application
*
* @default true
*/
listenToStorageChanges?: boolean
/**
* Write the default value to the storage when it does not exist
*
* @default true
*/
writeDefaults?: boolean
/**
* Merge the default value with the value read from the storage.
*
* When setting it to true, it will perform a **shallow merge** for objects.
* You can pass a function to perform custom merge (e.g. deep merge), for example:
*
* @default false
*/
mergeDefaults?: boolean | ((storageValue: T, defaults: T) => T)
/**
* Custom data serialization
*/
serializer?: Serializer<T>
/**
* On error callback
*
* Default log error to `console.error`
*/
onError?: (error: unknown) => void
/**
* Use shallow ref as reference
*
* @default false
*/
shallow?: boolean
}
export function useStorage(key: string, defaults: MaybeComputedRef<string>, storage?: StorageLike, options?: UseStorageOptions<string>): RemovableRef<string>
export function useStorage(key: string, defaults: MaybeComputedRef<boolean>, storage?: StorageLike, options?: UseStorageOptions<boolean>): RemovableRef<boolean>
export function useStorage(key: string, defaults: MaybeComputedRef<number>, storage?: StorageLike, options?: UseStorageOptions<number>): RemovableRef<number>
export function useStorage<T>(key: string, defaults: MaybeComputedRef<T>, storage?: StorageLike, options?: UseStorageOptions<T>): RemovableRef<T>
export function useStorage<T = unknown>(key: string, defaults: MaybeComputedRef<null>, storage?: StorageLike, options?: UseStorageOptions<T>): RemovableRef<T>
/**
* Reactive LocalStorage/SessionStorage.
*
* @see https://vueuse.org/useStorage
*/
export function useStorage<T extends(string | number | boolean | object | null)>(
key: string,
defaults: MaybeComputedRef<T>,
storage: StorageLike | undefined,
options: UseStorageOptions<T> = {},
): RemovableRef<T> {
const {
flush = 'pre',
deep = true,
listenToStorageChanges = true,
writeDefaults = true,
mergeDefaults = false,
shallow,
window = defaultWindow,
eventFilter,
onError = (e) => {
console.error(e)
},
} = options
const data = (shallow ? shallowRef : ref)(defaults) as RemovableRef<T>
if (!storage) {
try {
storage = getSSRHandler('getDefaultStorage', () => defaultWindow?.localStorage)()
}
catch (e) {
onError(e)
}
}
if (!storage)
return data
const rawInit: T = resolveUnref(defaults)
const type = guessSerializerType<T>(rawInit)
const serializer = options.serializer ?? StorageSerializers[type]
const { pause: pauseWatch, resume: resumeWatch } = pausableWatch(
data,
() => write(data.value),
{ flush, deep, eventFilter },
)
if (window && listenToStorageChanges) {
useEventListener(window, 'storage', update)
useEventListener(window, customStorageEventName, updateFromCustomEvent)
}
update()
return data
function write(v: unknown) {
try {
if (v == null) {
storage!.removeItem(key)
}
else {
const serialized = serializer.write(v)
const oldValue = storage!.getItem(key)
if (oldValue !== serialized) {
storage!.setItem(key, serialized)
// send custom event to communicate within same page
// importantly this should _not_ be a StorageEvent since those cannot
// be constructed with a non-built-in storage area
if (window) {
window.dispatchEvent(new CustomEvent<StorageEventLike>(customStorageEventName, {
detail: {
key,
oldValue,
newValue: serialized,
storageArea: storage!,
},
}))
}
}
}
}
catch (e) {
onError(e)
}
}
function read(event?: StorageEventLike) {
const rawValue = event
? event.newValue
: storage!.getItem(key)
if (rawValue == null) {
if (writeDefaults && rawInit !== null)
storage!.setItem(key, serializer.write(rawInit))
return rawInit
}
else if (!event && mergeDefaults) {
const value = serializer.read(rawValue)
if (isFunction(mergeDefaults))
return mergeDefaults(value, rawInit)
else if (type === 'object' && !Array.isArray(value))
return { ...rawInit as any, ...value }
return value
}
else if (typeof rawValue !== 'string') {
return rawValue
}
else {
return serializer.read(rawValue)
}
}
function updateFromCustomEvent(event: CustomEvent<StorageEventLike>) {
update(event.detail)
}
function update(event?: StorageEventLike) {
if (event && event.storageArea !== storage)
return
if (event && event.key == null) {
data.value = rawInit
return
}
if (event && event.key !== key)
return
pauseWatch()
try {
data.value = read(event)
}
catch (e) {
onError(e)
}
finally {
// use nextTick to avoid infinite loop
if (event)
nextTick(resumeWatch)
else
resumeWatch()
}
}
}