export function setItem(k: string, v: string): void {
  return localStorage.setItem(k, v)
}
export function getItem(k: string): string | null
export function getItem(k: string, defaultValue: any): string
export function getItem(k: string, defaultValue?: any): string | null {
  const val = localStorage.getItem(k)
  if (defaultValue !== undefined && val === null) {
    return defaultValue
  }
  return val
}