import { BaseFanyi } from './BaseFanyi';
export declare function pick<T extends object, K extends keyof T>(obj: T, keys?: K[]): Pick<T, K>;
export declare function omit<T extends object, K extends keyof T>(obj: T, keys?: K[]): Omit<T, K>;
export declare function assignOptions<T extends BaseFanyi<any>, O extends {
    url?: string;
}>(instance: T, options?: O): T;