declare function MMKVStorage(): any;

type StoredValueAndSetter<T> = [T | null, (value: T | ((prevValue: T) => T)) => void];

export declare function useMMKVStorage<T = any>(
  key: string,
  storage: MMKVStorage.API,
  defaultValue?: unknown
): StoredValueAndSetter<T>;

export declare function create(storage: MMKVStorage.API): <T = any>(key: string, defaultValue?: unknown) => StoredValueAndSetter<T>;

export declare const useIndex: (keys: Array<string>, type: "string" | "number" | "object" | "boolean" | "array", storage: MMKVStorage.API) => [unknown[], (key: string, value: unknown) => void, (key: string) => void]

export default MMKVStorage;


type ACCESSIBLE = {
  WHEN_UNLOCKED: string;
  AFTER_FIRST_UNLOCK: string;
  ALWAYS: string;
  WHEN_PASSCODE_SET_THIS_DEVICE_ONLY: string;
  WHEN_UNLOCKED_THIS_DEVICE_ONLY: string;
  AFTER_FIRST_UNLOCK_THIS_DEVICE_ONLY: string;
  ALWAYS_THIS_DEVICE_ONLY: string;
};

type MODES = {
  SINGLE_PROCESS: number;
  MULTI_PROCESS: number;
};

type Callback<T> = (error: Error | null, result: T | null | undefined) => void;



declare module MMKVStorage {
  export const MODES: MODES;

  export const ACCESSIBLE: ACCESSIBLE;

  export declare function getAllMMKVInstanceIDs(): string[];
  export declare function getCurrentMMKVInstanceIDs(): Record<string, boolean>;

  export const IDSTORE_ID: string;

  const myVar: string;

  class API {
    /**
     * Set a string value to storage for a given key.
     * This method is added for redux-persist support. It is similar to setStringAsync()
     *
     * @param {String} key
     * @param {String} value
     *
     */
    setItem(key: string, value: string): Promise<boolean | undefined>;
    /**
     * Get a string value for a given key.
     * This method is added for redux-persist support. It is similar to setStringAsync()
     * @param {String} key
     */
    getItem(key: string): Promise<string | null | undefined>;

    /**
     * Set a string value to storag for a given key.
     *
     * @param {String} key
     * @param {String} value
     *
     */
    setStringAsync(key: string, value: string): Promise<boolean | undefined>;
    /**
     * Get a string value for a given key.
     * @param {String} key
     */
    getStringAsync(key: string): Promise<string | null | undefined>;

    /**
     * Set a number value to storage for a given key.
     *
     * @param {String} key
     * @param {number} value
     *
     */
    setIntAsync(key: string, value: number): Promise<boolean | undefined>;

    /**
     * Get a number value for a given key
     * @param {String} key
     */
    getIntAsync(key: string): Promise<number | null | undefined>;

    /**
     * Set a boolean value to storag for a given key.
     *
     * @param {String} key
     * @param {boolean} value
     *
     */
    setBoolAsync(key: string, value: boolean): Promise<boolean | undefined>;

    /**
     * Get a boolean value for a given key.
     * @param {String} key
     */
    getBoolAsync(key: string): Promise<boolean | null | undefined>;

    /**
     * Set an Object to storage for a given key.
     *
     * @param {String} key
     * @param {Object} value
     *
     */

    setMapAsync(key: string, value: object): Promise<boolean | undefined>;
    /**
     * Get an Object from storage for a given key.
     * @param {String} key
     */
    getMapAsync<T extends object>(key: string): Promise<T | null | undefined>;
    /**
     * Set an array to the db.
     * @param {String} key
     * @param {Array} array
     */
    setArrayAsync(key: string, value: Array<any>): Promise<boolean | undefined>;
    /**
     * get an array from the storage for give key.
     * @param {String} key
     */

    getArrayAsync<T extends any>(key: string): Promise<Array<T> | null | undefined>;
    /**
     * Retrieve multiple Objects for a given array of keys. Currently will work only if data for all keys is an Object.
     * Arrays will also be returned but wrappen in a object.
     *
     * **Will not work if a key as a String value.**
     *
     * @param {Array} keys
     */
    getMultipleItemsAsync<T extends unknown>(
      keys: Array<string>,
      type:"string" |"number" | "map" | "boolean" | "array" | "object",
    ): Promise<Array<T>>;

    /**
     * Remove all keys and values from storage.
     */
    clearStore(): boolean | undefined;

    /**
     * Clear memory cache of the current MMKV instance
     */
    clearMemoryCache(): boolean | undefined;
    /**
     * Remove an item from storage for a given key.
     *
     * @param {String} key
     */
    removeItem(key: string): boolean | undefined;

    // NON ASYNC CALLS 

    /**
     * Set a string value to storag for a given key.
     *
     * @param {String} key
     * @param {String} value
     * @param {Callback<boolean>} callback
     */
    setString(key: string, value: string, callback?: Callback<boolean>): boolean | undefined;
    /**
     * Get a string value for a given key.
     * @param {String} key
     * @param {Callback<string>} callback
     */
    getString(key: string, callback?: Callback<string>): string | null | undefined;

    /**
     * Set a number value to storage for a given key.
     *
     * @param {String} key
     * @param {number} value
     * @param {Callback<boolean>} callback
     */
    setInt(key: string, value: number, callback?: Callback<boolean>): boolean | undefined;

    /**
     * Get a number value for a given key
     * @param {String} key
     * @param {Callback<number>} callback
     */
    getInt(key: string, callback?: Callback<number>): number | null | undefined;

    /**
     * Set a boolean value to storag for a given key.
     *
     * @param {String} key
     * @param {boolean} value
     * @param {Callback<boolean>} callback
     */
    setBool(key: string, value: boolean, callback?: Callback<boolean>): boolean | undefined;

    /**
     * Get a boolean value for a given key.
     * @param {String} key
     * @param {Callback<boolean>} callback
     */
    getBool(key: string, callback?: Callback<boolean>): boolean | null | undefined;

    /**
     * Set an Object to storage for a given key.
     *
     * @param {String} key
     * @param {Object} value
     * @param {Callback<boolean>} callback
     */

    setMap(key: string, value: object, callback?: Callback<boolean>): boolean | undefined;
    /**
     * Get an Object from storage for a given key.
     * @param {String} key
     * @param {Callback<object>} callback
     */
    getMap<T extends object>(key: string, callback?: Callback<T>): T | null | undefined;
    /**
     * Set an array to the db.
     * @param {String} key
     * @param {Array} array
     * @param {Callback<boolean>} callback
     */
    setArray(
      key: string,
      value: Array<any>,
      callback?: Callback<boolean>
    ): boolean | undefined;
    /**
     * get an array from the storage for give key.
     * @param {String} key
     * @param {Array<any>} callback
     */
    getArray<T extends any>(
      key: string,
      callback?: Callback<Array<T>>
    ): Array<T> | null | undefined;
    /**
     * Retrieve multiple Objects for a given array of keys. Currently will work only if data for all keys is an Object.
     * Arrays will also be returned but wrappen in a object.
     *
     * **Will not work if a key as a String value.**
     *
     * @param {Array} keys
     * @param {Array<unknown>} callback
     */
    getMultipleItems<T extends any>(
      keys: Array<string>,
      type:"string" |"number" | "map" | "boolean" | "array" | "object",
      callback?: Callback<Array<T>>
    ): Array<T>;

    /**
     *
     * Get all MMKV Instance IDs.
     *
     */
    getAllMMKVInstanceIDs(): string[];

    /**
     *
     * Get all MMKV Instance IDs that are currently loaded
     *
     */

    getCurrentMMKVInstanceIDs(): Record<string, boolean>;

    /**
     * Get the key and alias for the encrypted storage
     */
    getKey(): { alias: string, key: string };

    encryption: encryption;

    indexer: indexer;

    transactions:transcations;
  }

  


  export class Loader {
    /**
     * Load MMKV with the specified ID. If instance does not exist, a new instance will be created.
     * @param {String} id
     */
    withInstanceID(id: string): this;

    /**
     * Encrypt MMKV Instance and store the creditials in secured storage for later use.
     * The key for encryption is automatically generated and the default alias for key storage is 'com.MMKV.ammarahmed' which is converted to HEX for usage.
     *
     * Requires an ID to be specified.
     *
     */
    withEncryption(): this;

    /**
     * Set accessible mode for secure storage on ios devices
     *
     * @param accessible MMKVStorage.ACCESSIBLE
     */

    setAccessibleIOS(accessible: ACCESSIBLE): this;

    /**
     * Provide a custom key to encrypt the storage. Use this if you dont want to generate the key automatically.
     * You must call withEncryption() to use this.
     * To store your key for later use call withSecureKeyStorage() too.
     *
     * @param {string} key the key to encrypt the storage with
     * @param {boolean} secureKeyStorage Should the key be stored securely.
     * @param {string} alias Provide an alias for key storage. Default alias is aliasPrefix + instanceID
     */

    encryptWithCustomKey(
      key: string,
      secureKeyStorage: boolean,
      alias: string
    ): this;

    /**
     * Set the processing mode for storage.
     *
     * Will recieve the following values.
     * MMKV.MULTI_PROCESS
     * MMKV.SINGLE_PROCESS
     *
     * @param {number} mode Set processing mode for storage
     */

    setProcessingMode(mode: number): this;

    /**
     * Finally after setting all the options, call this to create the instance.
     *
     */

    initialize(): API;
  }
}

class indexer {
  /**
   * Get all keys from storage.
   *
   */
  getKeys(): Promise<Array<string>>;

  /**
   * Check if a key exists in storage.
   *
   * @param {String} key
   */
  hasKey(key: string): boolean;

  strings: {
    /**
     * Get all keys from strings index;
     *
     */
    getKeys(): Promise<Array<string>>;

    /**
     * Check if a key exists in strings index;
     *
     * @param {String} key
     */
    hasKey(key: string): boolean;

    /**
     * Get all strings in the strings index
     *
     */
    getAll(): Promise<Array<[]>>;
  };

  numbers: {
    /**
     * Get all keys from numbers index;
     *
     */
    getKeys(): Promise<Array<string>>;

    /**
     * Check if a key exists in numbers index;
     *
     * @param {String} key
     */
    hasKey(key: string): boolean;

    /**
     * Get all numbers in the numbers index;
     *
     */
    getAll(): Promise<Array<[]>>;
  };

  booleans: {
    /**
     * Get all keys from booleans index
     *
     */
    getKeys(): Promise<Array<string>>;

    /**
     * Check if a key exists in booleans index
     *
     * @param {String} key
     */
    hasKey(key: string): boolean;

    /**
     * Get all booleans in the booleans index
     *
     */
    getAll(): Promise<Array<[]>>;
  };

  maps: {
    /**
     * Get all keys from maps index
     *
     */
    getKeys(): Promise<Array<string>>;

    /**
     * Check if a key exists in maps index
     *
     * @param {String} key
     */
    hasKey(key: string): boolean;

    /**
     * Get all items in the maps index
     *
     */
    getAll(): Promise<Array<[]>>;
  };

  arrays: {
    /**
     * Get all keys from array index
     *
     */
    getKeys(): Promise<Array<string>>;

    /**
     * Check if a key exists in array index
     *
     * @param {String} key
     */
    hasKey(key: string): boolean;

    /**
     * Get all arrays in the array index
     *
     */
    getAll(): Promise<Array<[]>>;
  };
}

class encryption {
  /**
   * You can encrypt an MMKV instance anytime, even after it is created.
   *
   * Calling this without a key will generate a key itself & store it in secure storage.
   * If no parameters are provided, a key is generated and securely stored in the storage with the default alias for later use.
   *
   * @param {string} key; Provide a custom key to encrypt the storage.
   * @param {boolean} secureKeyStorage Store the key in secure storage.
   * @param {string}  alias Provide a custom alias to store the key with in secure storage
   * @param {ACCESSIBLE}  accessibleMode Set accessible mode for secure storage on ios devices
   * @returns An object with alias and key
   */
  encrypt(
    key: string,
    secureKeyStorage: boolean,
    alias: string,
    accessibleMode: ACCESSIBLE
  ): Promise<boolean>;

  /**
   * You can decrypt an encrypted MMKV instance anytime, even after it is created.
   * Decrypting the storage will delete the key you encrypted it with
   *
   */
  decrypt(): Promise<boolean>;

  /**
   * Change the encryption key incase the old one has been compromised.
   * @param {string} key; Provide a custom key to encrypt the storage.
   * @param {boolean} secureKeyStorage Store the key in secure storage.
   * @param {string}  alias Provide a custom alias to store the key with in secure storage
   * @param {ACCESSIBLE}  accessibleMode Set accessible mode for secure storage on ios devices
   */

  changeEncryptionKey(
    key: string,
    secureKeyStorage: boolean,
    alias: string,
    accessibleMode: ACCESSIBLE
  ): Promise<boolean>;
}

class transcations {
  register(type: "string" | "number" | "object" | "array" | "boolean", transaction: "beforewrite" | "onwrite" | "onread" | "ondelete", mutator: (key: string, value: unknown) => void):() => {} 
  unregister(type: "string" | "number" | "object" | "array" | "boolean", transaction: "beforewrite" | "onwrite" | "onread" | "ondelete"):void
  clear():void
}