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export declare class AsyncContext implements OnModuleInit, OnModuleDestroy {
    private readonly internalStorage;
    private readonly asyncHookRef;
    private static instance;
    private constructor();
    static getInstance(): AsyncContext;
    onModuleInit(): void;
    onModuleDestroy(): void;
    set<TKey = any, TValue = any>(key: TKey, value: TValue): void;
    get<TKey = any, TReturnValue = any>(key: TKey): TReturnValue;
    register(): void;
    private getAsyncStorage;
    private static initialize;
}

class AsyncContext {
  // Clear all values from storage
  clear(): void;

  // Delete value by key from storage
  delete(key: K): boolean;

  // Iterate over storage
  forEach(callbackfn: (value: V, key: K, map: Map<K, V>) => void, thisArg?: any): void;

  // Get value from storage by key
  get(key: K): V | undefined;

  // Check if key exists in storage
  has(key: K): boolean;

  // Set value by key in storage
  set(key: K, value: V): this;

  // Get number of keys that stored in storage
  get size: number;

  // Register context, it's better to use this method inside the interceptor
  register(): void

  // Register context for a callback, it's better to use this inside the middleware
  registerCallback<R, TArgs extends any[]>(callback: (...args: TArgs) => R, ...args: TArgs): R

  // Unregister context
  unregister(): void
}