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a guest Aug 25th, 2019 53 Never
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  1. export interface Storage {
  2.   getItem: (key: string) => string | null
  3.   setItem: (key: string, value: string) => void
  4.   removeItem: (key: string) => void
  5. }
  6.  
  7. const fallback: Storage = {
  8.   getItem: (key: string): string | null => {
  9.     console.log(`This is fallback key "${key}" cannot be readed`)
  10.  
  11.     return null
  12.   },
  13.   setItem: (key: string, value: string): void => {
  14.     console.log(`This is fallback key "${key}" with value "${value}" cannot be writen`)
  15.   },
  16.   removeItem: (key: string): void => {
  17.     console.log(`This is fallback key "${key}" cannot be removed`)
  18.   },
  19. }
  20.  
  21. export const localStorage = typeof window !== 'undefined' ? window.localStorage : fallback
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