export declare enum StorageAreaName {
    local = "local",
    sync = "sync"
}
interface StorageChange {
    newValue?: any;
    oldValue?: any;
}
interface StorageChanges {
    [key: string]: StorageChange;
}
export interface StorageListener {
    (changes: StorageChanges, area: StorageAreaName): void;
}
export interface StorageAddListener {
    (listener: StorageListener): void;
}
export interface StorageData {
    [key: string]: any;
}
export declare type StorageGetCallback = (data: StorageData) => void;
export declare type StorageGetKeys = string | string[] | StorageData | null;
export interface StorageAreaQuotas {
    QUOTA_BYTES: number;
    QUOTA_BYTES_PER_ITEM?: number;
}
export interface StorageAreaCallbacked extends StorageAreaQuotas {
    get(callback: StorageGetCallback): void;
    get(keys: StorageGetKeys, callback: StorageGetCallback): void;
    set(data: StorageData, callback?: () => void): void;
    clear(): void;
}
export interface StorageAreaPromised extends StorageAreaQuotas {
    get(keys?: StorageGetKeys): Promise<StorageData>;
    set(data: StorageData): Promise<void>;
    clear(): void;
}
export interface ApisNamespace {
    storage: {
        onChanged: {
            addListener: StorageAddListener;
        };
    };
    runtime: {
        lastError?: {
            message?: string;
        };
    };
}
export interface ChromeNamespace extends ApisNamespace {
    storage: {
        local: StorageAreaCallbacked;
        sync: StorageAreaCallbacked;
        onChanged: ApisNamespace['storage']['onChanged'];
    };
}
export interface BrowserNamespace extends ApisNamespace {
    storage: {
        local: StorageAreaPromised;
        sync: StorageAreaPromised;
        onChanged: ApisNamespace['storage']['onChanged'];
    };
}
export {};