Method has

types/cache.d.ts:5–5

(cacheName: string)

export interface CacheStorage {
  match (request: RequestInfo, options?: MultiCacheQueryOptions): Promise<Response | undefined>,
  has (cacheName: string): Promise<boolean>,
  open (cacheName: string): Promise<Cache>,
  delete (cacheName: string): Promise<boolean>,
  keys (): Promise<string[]>