@plq/use-persisted-state/src/utils/get-persisted-value.ts

useState hook with persistence in storage

import { isFunction } from '@plq/is'

export default function<T>(key:string, initialValue: T | (() => T), persist?: string): T {
  let initialPersist: { [x: string]: unknown }

  try {
    initialPersist = persist ? JSON.parse(persist) : {}
  } catch {
    initialPersist = {}
  }

  let initialOrPersistedValue = isFunction(initialValue) ? initialValue()  : initialValue

  if (initialPersist && key in initialPersist) {
    initialOrPersistedValue = (initialPersist[key] as T) ?? initialOrPersistedValue
  }

  return initialOrPersistedValue
}