Package Exports

@plq/use-persisted-state

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Readme

usePersistedState

Persists the state to localStorage, sessionStorage or any custom storage

Features

Persist the state to localStorage, sessionStorage or almost anything else implements storage API
The state factory takes as many keys as needed, so you don't have to call the factory for each variable
Written with the Typescript, the definitions go with the library
No dependencies

Example

import createPersistedState from '@plq/use-persisted-state'
import storage from '@plq/use-persisted-state/lib/storages/local-storage'

const [usePersistedState] = createPersistedState('example', storage)

export default function App() {
  const [count, setCount] = usePersistedState('count', 0)
  const handleIncrement = () => setCount(prevCount => prevCount + 1)

  return (
    <div>
      {count}
      <button onClick={handleIncrement}>+</button>
    </div>
  )
}

Requirement

To use @plq/use-persisted-state, you must use react@16.8.0 or greater which includes Hooks.

Clear Storage

import createPersistedState from '@plq/use-persisted-state'
import storage from '@plq/use-persisted-state/lib/storages/local-storage'

const [usePersistedState, clear] = createPersistedState('example', storage)

export default function App() {
  const [count, setCount] = usePersistedState('count', 0)
  const increment = () => setCount(prevCount => prevCount + 1)

  return (
    <div>
      {count}
      <button onClick={increment}>+</button>
      <button onClick={clear}>Clear</button>
    </div>
  )
}

Use sessionStorage

import createPersistedState from '@plq/use-persisted-state'
import storage from '@plq/use-persisted-state/lib/storages/session-storage'

const [usePersistedState, clear] = createPersistedState('example', storage)

Use async storage

import createPersistedState from '@plq/use-persisted-state'
// or
import { createAsyncPersistedState } from '@plq/use-persisted-state'
import { local } from '@plq/use-persisted-state/lib/storages/browser-storage'

const [usePersistedState, clear] = createPersistedState('example', local)

Use custom storage

The storage API is similar to the browser.storage but with a few exceptions

import createPersistedState from '@plq/use-persisted-state'

const storageListeners = new Set()

onChangeSomeStorage(event => {
  const changes = {
    [event.key]: {
      newValue: event.newValue,
      oldValue: event.oldValue,
    },
  }
    
  listeners.forEach(listener => {
    listener(changes)
  })
})

const myStorage = {
  get: keys => getItemsFromSomeStorage(keys),
  set: items => setItemsToSomeStorage(items),
  remove: keys => removeItemsFromSomeStorage(keys),
  onChanged: {
    addListener: listener => storageListeners.add(listener),
    removeListener: listener => storageListeners.delete(listener),
    hasListener: listener => storageListeners.has(listener),
  }
}

const [usePersistedState, clear] = createPersistedState('example', myStorage)