import { PluginFunction } from 'vue';
/**
 * Options for the VuePersistentStorageManager plugin.
 */
export interface PluginOptions {
    /**
     * If true, localStorage.setItem and localStorage.removeItem will be replaced with custom functions.
     */
    watchStorage: boolean;
}
/**
 * Wrapper for the StorageManager API. Provides the state of the persistent-storage permission alongside a storage estimate.
 */
export declare class VuePersistentStorageManager {
    /**
     * Indicates that the StorageManager API is available.
     */
    readonly isAvailable: boolean;
    /**
     * Contains storage quota and usage information.
     */
    readonly storageEstimate: StorageEstimate;
    private _isPersistent;
    /**
     * Installs a VuePersistentStorageManager as a Vue plugin.
     */
    static install: PluginFunction<PluginOptions>;
    /**
     * Creates a new VuePersistentStorageManager instance.
     */
    constructor();
    /**
     * Indicates that persistence of localStorage has been granted.
     */
    get isPersistent(): boolean;
    /**
     * Requests persistence of localStorage.
     * @returns a Promise that resolves to true if permission has been granted.
     */
    requestPersistentStorage(): Promise<boolean>;
    private _refreshIsPersistent;
    private _refreshStorageEstimate;
    private _modifyLocalStorageFunctions;
}
declare module 'vue/types/vue' {
    interface Vue {
        /**
         * Wrapper for the StorageManager API. Provides the state of the persistent-storage permission alongside a storage estimate.
         */
        $storageManager: VuePersistentStorageManager;
        /**
         * Contains storage quota and usage information.
         */
        $storageEstimate: StorageEstimate;
    }
}
declare global {
    interface Storage {
        originalSetItem?: ((key: string, value: string) => void) | undefined;
        originalRemoveItem?: ((key: string) => void) | undefined;
    }
}