type DeepPartial<T> = {
    [P in keyof T]?: DeepPartial<T[P]>;
};
interface ActualCpfFormattingOptions<ER = unknown> {
    delimiters: {
        dash: string;
        dot: string;
    };
    escape: boolean;
    hidden: boolean;
    hiddenKey: string;
    hiddenRange: {
        end: number;
        start: number;
    };
    onFail: (value: string, error: Error) => ER;
}
type CpfFormattingOptions = DeepPartial<ActualCpfFormattingOptions>;

/**
 * Validate a given CPF char sequence.
 */
declare function cpfFmt(cpfString: string, options?: CpfFormattingOptions): string;

export { cpfFmt as default };