export declare function assertMaybeHasKeys<T extends string>(name: string, mixed: any, keys: T[]): (null | undefined | ({
    [key: string]: any;
})) | never;
export declare function assertMaybeHasKeysHandler<T extends string>(keys: T[]): (name: string, mixed: any) => (null | undefined | ({
    [key: string]: any;
})) | never;
export declare function assertMaybeNotHasKeys<T extends string>(name: string, mixed: any, keys: T[]): (null | undefined | ({
    [key: string]: any;
})) | never;
export declare function assertMaybeNotHasKeysHandler<T extends string>(keys: T[]): (name: string, mixed: any) => (null | undefined | ({
    [key: string]: any;
})) | never;